Latest News - Northern Utah WebSDR

Northern Utah WebSDR
KD7EFG

Current Issues and
Latest News

Ongoing (long term) issues:

Degraded performance on East-pointing beam

As noted in the 7-9 March, 2025 entry, the performance of the LP-1002 east-pointing beam has degraded for reasons currently unknown. WSPR monitoring indicates that it still has directivity, but that the gain is reduced.
To diagnose/repair this antenna we'll need to wait for the convergence of several things: The availability of a 110 foot boom lift, a run of very dry weather so that the boom lift doesn't get stuck in the mud, the possibility that we'll have to wait for a family of owls to leave the nest (we don't know if they are there this year or not) and a clear schedule for a weekend or two to permit repairs to be done.

We expect that this antenna work will likely happen in June-July.

In the meantime, we are occasionally checking the beam on the presumption that the issues are due to moisture ingress and that the combination of warmer and drier weather will result in the improvement of performance - which, itself would also be diagnostic.
It's possible that prior to the main work party that we'll climb the tower to see if there's something obvious wrong - perhaps a failed connection or damage to the coaxial cable - but the timing of that has yet to be determined.
It's worth noting that when the antenna was first re-commissioned in 2019-2020 after decades of non-use, it was fine. Murphy, I suppose.

Power line noise noted on some bands on WebSDR #5.

As WebSDR #5's antenna is a northwest-pointing beam which is aimed at these power lines, emissions of noise from these lines will be noticed there, first. We have - for years - been working with the power company to mitigate this noise issues but it is a slow process on this very old (circa 1960s) power line hardware.

Investigation of new(er) WebSDR server software.

We are looking into newer/other software for our public-facing WebSDR server: See the "New Servers" page (link) for more information.

Recent events and resolved issues:

16-18 May, 2025 - More analysis of the East-pointing beam - and occasional signal outages on WebSDR #4 (Magenta).

During this site visit there were occasional outages on WebSDR #4 as we did additional analysis of the East-pointing beam - including more TDR measurements.
Earlier this week (the days around 14 May) severe weather systems went through the area and there were indications of very nearby lightning strikes in the vicinity of the WebSDR.
At about this time it was noticed that the signal levels on the East pointing beam degraded even more - but there was also a sudden increase in what appears to be local QRM that may have explained this degradation. The suspicion was that a coaxial cable's shield connection in this antenna's signal path was compromised in some way - but there's no way to know if this happened on its own, or had something to do with the storm. This was investigated and the results are as follows:

On site, we noticed that we were seeing "warblies" - equally-spaced unstable carriers - on some band and receiver combinations - something that had been observed remotely. They were most obvious on 40 meters on WebSDR #4.
It was quickly determined once on site that these "warblies" were emanating from the UPS - a fact corroborated by noting that they disappeared when we switched over to battery and drifted back on frequency after restoring mains power. If you recall, we'd installed filtering on the UPS - and in a more recent site visit we bonded the mains filters for the input/output to the UPS chassis to reduce conducted noise. At first it was wondered if we needed to do additional filtering.
It turned out that this noise was being radiated from the cable connected to a Bluetooth adapter that can be used for monitoring/configuring the UPS via an app: It has a 10 foot (3 meter) cable which was wound up, but stuck in a gap between the top of the UPS and a cable tray. RF from this cable was being conducted to the cable tray which, in turn, caused this noise to be coupled into the mains wiring, out of the building and on to the overhead power cabling: This was how RF from the UPS was getting coupled out "into the air" and being heard on the receivers.
Some ferrite noise suppression toroids were wound on the Bluetooth adapter's cable - which reduced it but two more methods of eliminating this conducted interference were found:

Instead of placing the excess cable between the top of the UPS and the cable tray - where it could couple into the electrical system - it could be placed between the bottom of the UPS and the mains filter box connected to it, effectively surrounding it on several sides with a shield: This seemed to reduce the QRM to the point of inaudibility.
Simply disconnect the cable! We never need to use the Bluetooth adapter when we are not on site so it can be left disconnected the vast majority of the time. This is what we finally did.

With this source of QRM quashed, the receive spectrum on HF looks a bit cleaner.

As noted|, we did more TDR measurements - the results are yet to be analyzed,

Time-Domain Reflectometry (TDR) results done at the antenna connection at the bottom of the tower.

2 May, 2025 - Analysis of the East-pointing beam to cause outages of WebSDR #4 (Magenta) and possibly others.

On 2 May, 2025 time period we will be did occasional testing of the East Pointing beam that interrupted signals on the receivers using that antenna (e.g. WebSDR #4 - Magenta - and some of the KiwiSDRs).
As noted on the banner at the top of this page, signals have degraded on this antenna and when we are at the site and have time to do so, we'll occasionally re-do previous measurements to note any changes as well as bring to bear other gear to further aid in the analysis.
We also be conducted transmit tests on this antenna to see if the application of a moderate amount of RF power (100 watts) will induce changes in VSWR: It did not. When we do these transmissions it will likely disrupt other receivers/servers on site due to signal overload during this testing.
TDR (Time-Domain Reflectometry) analysis of the east-pointing beam

On 2 May, 2025 - braving clouds of mosquitoes - we attached a TDR (Time Domain Reflectometer) to the feed of the east-pointing beam at the bottom of the tower. The resulting trace (right) shows a reflected pulse in the same polarity as the TDR delayed by 220 nanoseconds as indicated by the vertical magenta lines: As this is round-trip time, the delay to the fault is half this interval, or about 110 nanoseconds. Note that this is a negative-going pulse from the generator.
The feedline going up the tower consists of about 80 feet (24.4 meters) of LDF4-50 coaxial cable with a velocity factor of 88% where it transitions to a section of air-insulated coaxial cable (VF of around 95%) that is approximately 32 feet (10 meters) in length that goes to the back ("big end") of the beam.
The pulse to the right shows that the LDF4-50 and the air-insulated line is probably fine as there are no obvious discontinuities during the main return.
To the right of the main return pulse marked by the magenta vertical bars is another return signal - this one showing a discontinuity which indicates two things:

The location of this discontinuity is consistent with where the feedline on the antenna makes a "U" turn and goes back toward the front ("small end") of the beam.
The amplitude of the pulse beyond the discontinuity is about 40% of the incident pulse, implying an impedance of the return signal in the area of 75-85 ohms.

Unfortunately, the duration of the saved pulse diagram is insufficient to allow analysis farther along the antenna's feedline: More TDR measurements will be done during the next site visit. We also wish that we'd done a TDR measurement when the antenna was working properly!
As noted above, work on the antenna will likely happen in June or July at the earliest.

23 April, 2025 - Various network outages.

Earlier on this day much of Northern Utah experienced Internet outages. Due to "deferred maintenance" on the part of a Utah state agency, numerous brief power outages coupled with no functional back-up power caused network nodes on the main fiber trunk to lose power - followed by a lengthy period when routers and servers rebooted. This affected many Internet users in parts of Northern Utah, across different ISPs - and it also affected many cell customers as well.

Obviously, the Northern Utah WebSDR was one of the (many) affected customers.

Lightning-induced outages

In the evening - around sunset - a strong storm front moved through the area north of the Great Salt Lake, resulting in a number of lightning strikes. Apparently a number of these struck very near the Northern Utah WebSDR's remote site, causing the routers/network devices to reset due to the disturbances, knocking users off the system when this happened.

Initial assessment shows a number of issues:

"10M Hi" on WebSDR #4 seems to be very deaf.

WSPR server "KD7EFG" - which also reports FT4 and FT8 spots is offline and has not been able to be restarted remotely.

The server for the CW skimmer was offline and could be restarted remotely.

Eventually, things were restarted, but several issues persist:

WebSDR #4 (Magenta) "seems" to be a bit unstable. Since that time, we've had issues with receivers randomly going offline - the symptom either being NO signals at all or - particularly on 40, 20, 15 and 10 meters - a periodic loud "bang" or "clang" sound across the entire spectrum. When (finally) noticed, these receivers are reset remotely.
The "10 Meter High" receiver on WebSDR #4 is still very deaf.

When the two known lightning strikes occurred, it did not cause WebSDR #4 to reboot - but it's possible that the operating system is somewhat scrambled and, possibly, some hardware needs to be power-cycle re-initialized - something that we'll do if these problems persist.

5-6 April, 2025 - Club callsign for the Northern Utah WebSDR.

There is now a callsign associated with the Northern Utah WebSDR's operators - it is KD7EFG.
All WSPR and FT4/8 reporting, CW skimming and other similar activities have been changed from the previously-used callsign of "KA7OEI" to "KD7EFG" at 0000 UTC on 6 April, 2025.
There will be no routine transmissions on the HF bands using this callsign - but in the event that a special occasion warrants it, they will be announced on the Northern Utah WebSDR's web site and Facebook pages.

14 March, 2025 - More analysis of the LP-1002 east-pointing antenna (feeding WebSDR #4 - Magenta).

On this day our local correspondent was able to do more checking, following up on what was done during the March 7-9 site work. During that work we "discovered" that the return loss (which translates to VSWR) of the LP-1002 east-pointing antenna was very much higher than expected - on the order of 2-3dB (between 6:1 and 10:1 VSWR) when spot-checked on various amateur bands.
Several years ago we'd measured this antenna and found it to be between 14 and 7 dB (between 1.5:1 and 2.5:1 VSWR) - not an unreasonable value for a wide-band, log-period antenna. These measurements were made after several weeks of dry weather.
Suspect readings

When we'd measured the VSWR several years ago we initially tried it with a conventional "Antenna Analyzer", finding that the VSWR was extremely high - but this result was accompanied with the meter slamming "full scale" at any frequency. This was immediately recognized as a potential issue with antenna analyzers: Sensitivity to other, off-air signals. As it happens, this large antenna does a good job of intercepting energy from both FM and AM broadcast stations and this energy was getting into the analyzer's detector, appearing as reflected power and causing an erroneous reason.
Upon seeing this, we used an HF transceiver and conventional VSWR bridge. As the power levels in this method are orders of magnitude higher, the effects of interception of broadcast-band signals are negligible, removing this vulnerability: It was via this method that we'd done our "authoritative" VSWR measurements.
During the recent site visit, we didn't use a conventional antenna analyzer, but a NanoVNA, and we got results indicating a very high VSWR - but was this due to the NanoVNA being overloaded or were these readings real? As we didn't happen to have an HF transceiver and VSWR bridge on hand, it wasn't until this day that we were able re-measure.

We first re-measured the antenna using the NanoVNA, finding that the results were in line with what we'd seen the week before. Wielding an HF transceiver (an FT-817) and a VSWR bridge the forward and reverse power readings were measured. Unfortunately, these readings confirmed what the NanoVNA was seeming to tell us: There IS something amiss with this antenna system. This didn't actually answer the question about whether the NanoVNA was being overloaded, but it did verify the supposition that there was a problem with the antenna.
With the recent wet weather, we suspect the ingress of water in some of its air-based transmission lines. Over the next several months we expect progressively drier weather and we'll re-measure the antenna several times. Later this year - probably no earlier than May or June - we'll bring a boom lift on site and see what sort of remediation is possible.
In the meantime, it appears that the antenna is directional, with front-to-back ratio. We suspect, however, that the degradation has reduced absolute signal levels (e.g. forward gain) but we have verified that on all bands, the receivers on WebSDR #4 (Magenta) are hearing the background noise floor meaning that it's still "hearing" all the signals that are there.

7-9 March, 2025 - Site work/visit

Network gear firmware update

We took the opportunity to upgrade the firmware on the network gear on-site, which added some functionality that we will be using in the future. This update enhances the robustness and security of the network infrastructure.
During this time, there were several outages as the devices rebooted - which is why we had posted the bright, red banners on the WebSDR servers indicating that this would be happening.

New UPS quieted

The first order of business was to fix a problem that we inadvertently created when we did work on our UPS. As noted in the 10 January entry, we'd added a 50 amp power circuit and filter to allow the UPS to charge at full current (40 amps into the 48 volt battery bank) and carry the load - but since this filter was quite large, it was in its own enclosure. Prior to this we'd used the filters in the older filter box used with the previous incarnation of the UPS and "bulk charger" - but since this was limited to 15 amps, total, our 48 volt UPS battery recharge rate was limited to about 15 amps. Since the AC input/output connections were in the same chassis, any circulating currents were contained.
While we originally we thought that there would be no issue, the fact that the input filter, the UPS and the output filters - all on the 120 volt lines - were in separate enclosures meant that there were circulating RF currents between them all. This allowed there to be some QRM on the HF bands - and it so-happened that 15 meters, particularly on WebSDR 5, was most affected, but we could see affects elsewhere if we did "A/B" comparisons.
The "fix" was to bond the three boxes (UPS, input filter and output filter) - which are right next to each other - with wide (2", 5cm) copper straps: A "flappy sander disk" was used to first bare the metal on the boxes and then a number of stainless-steel self-tapping "tek" screws were used to physically connect the copper to the steel - and some anti-oxidant grease was used to make sure that the electrical connection was maintained over time. It's worth noting that short jumpers of 12 AWG copper wire had minimal effect as their impedances - even over a short length - was a bit too high.
The result of this work was that we could no longer detect interference from the UPS on any HF band emanating from the UPS.
Even though there were no obvious issues at this point, we added ferrites to the battery cables. The battery cables are comprised of two parallel 6 AWG battery cables - each with five bifilar turns wound through them on an FT-240-77 core. The use of a type 77 ferrite was to maximize efficacy at the lower HF frequencies - but it also works reasonably well on higher bands.
All of this work had relatively little effect on the really low frequencies: The 20 kHz fundamental switching frequency of the UPS - and its first four or five harmonics - are still visible on the KiwiSDRs, but this would be because the line filters simply don't have the reactance to effectively filter out these very low frequencies which will be conducted out onto the input and output AC power leads. On a future trip we'll strategically add some larger-value plastic capacitors to see if they will improve attenuation at these low frequencies.

25 meter receiver feed fixed.

We noticed that the 25 meter SWBC receiver on WebSDR #3 (Blue) didn't "look right" and discovered that an SMA to BNC patch cable had been damaged, the shield being open at the SMA end. As this was PTFE (Teflon) coaxial cable, we simply bared a bit of the shield and flowed solder over it, effecting a repair.

Copper bonding straps between UPS and filters

Copper bonding straps between the UPS (upper-right) and the filter boxes (bottom and upper-left). This quashed circulating RF currents, eliminating conducted/radiated RFI from the UPS.
(Click on the image for a larger version)

S-meter calibrations checked/adjusted.

Since we had the time to do so, the S-meter calibrations were checked on WebSDRs 1 (Yellow) and 2 (Green). Several of the bands (notably 160, 80 and 20) were off a bit, but they now agree with the signal levels arriving at the antenna terminals.

VSWR Plots taken of antennas

We also took the opportunity to sweep the HF (and the 6 meter) antenna with a VNA:

TCI-530 omni. This plot yielded the expected result: A VSWR between 1.5:1 and 2.5:1 across the 3-30 MHz range - which is as per specifications.
KLM 10-30-7LPA. This is the "Northwest Beam" antenna used by WebSDR #5 and is at approximately the 53' (16 meter) level above ground. It showed a VSWR below 2.5:1 on the amateur bands between 10 and 30 MHz.
Cushcraft AR-6. This is the "6 Meter Omni" antenna (used by WebSDR #2, Green) and this antenna is at approximately the 30' (9 meter) level above ground. This antenna showed less than 2.25:1 across the entire 6 meter band, being lowest at the bottom end of the band.
Hy-Gain LP-1002. This is the monster 6-40 MHz east-pointing beam used by WebSDR #4 (Magenta).

There appear to be some issues with this antenna: Although it seems to be working OK and has directionality, the VSWR is all over the place - rarely dropping below 2:1, but much of the time it's above 5:1.
We'll re-check and compare the sweeps on a future site visit when possible moisture ingress into the feed assembly would have had time to dry out. At this time we'll re-check with the same NanoVNA to see if anything changes as well as taking the antenna out of service for a while to test with an HF transmitter and conventional VSWR bridge.
In a past sweep this antenna had shown an approximately 2.5:1 match or better across much of its frequency range, on the amateur bands. At the time that we did this test, we could not use a conventional antenna analyzer due to the high RF fields from "nearby" AM and FM broadcast stations and, instead, used a transmitter and a VSWR bridge. As we had only the NanoVNA on hand, we can't be sure that the VNA itself wasn't giving bad readings due to being overloaded.
If we find that there are actual problems, as availability and schedules permit we'll schedule the use of a "Boom lift" to access the antenna directly and determine what might be happening - but this is not likely to occur until sometime in May or June at the earliest.

16 February, 2025 - CW Skimmer upgraded

As you may or may not already know, a CW skimmer operates from the Northern Utah WebSDR site, leveraging the receivers, filtering and antenna already in place. The "skimmer" is software that listens for callsigns - on CW - and reports them to the Reverse Beacon Network - link. Calls reported by our skimmer are currently reported using the callsign "ka7oei".

CW reports from this skimmer system may also be seen on PSK Reporter - link to map as well. To see such reports select the same callsign as above and "CW" as the mode and hit "go". This reporting method is also undergoing testing and may/may not always be active.

Previously, we'd been using cast-off PCs that had been donated, but we recently upgraded to a small form-factor mini-PC running an AMD Ryzen 5850 which has more processing power (16 cores) than the previous PCs put together while consuming less electrical power overall. Onto this machine, a virtualization package was installed and we currently have three operational Windows Server 2025 instances running on this computer, giving us three separate environments in which we can run the Skimmer software. We have a fourth instance available that we may use if we need to spread the processing load a bit more among cores and/or add additional receivers (e.g. 60 meters, the beacon portion of 10 meters, etc.)
This upgrade has allowed us to "spin up" more skimmer receiver instances so we are currently testing with receivers on 630, 160, 80 and 6 meters with a single receiver, each on omnidirectional antennas. 40 meters represents both the omni antenna and the east-pointing log periodic while 30, 20, 17, 15, 12 and 10 meters are receiving signals on the Omni, east-pointing beam and the northwest-pointing beam. The multi-band receive data is processed by the "SkimCon" program - which also prevents duplication of reports that are received by more than one receiver on the same band but on a different antenna.
This system is still in a testing phase and is likely to be up and down due to (unforeseen?) problems and final configuration changes.

13 February, 2025 - RFI on 15 meters - mostly on WebSDR #5

It's been observed that there's "excess" noise on the 15 meter receiver on WebSDR #5 (Teal - the northwest-pointing beam) in the form of switching supply harmonics spaced about 65 kHz apart plus an elevated noise with a 120 Hz component.
On this day we were able to confirm that this is being produced by the UPS. Despite there being filtering on the input and output power connections, this RF energy seems to be escaping - but it seems to have a broad resonance around 15 meters (21 MHz).
One of the tasks that we'd not been able to finish during the last site visit was the bonding of the UPS chassis, its ground wire and the two mains filter chassis and we suspect that this is the cause of this issue - and, possibly, installing additional ferrite devices. This is was already on our "to do" list on the next site visit.
In recent weeks there has been elevated power line noise affecting several different bands: This is likely due to a recent "mud rain" (e.g. alkaline and salty dust swept up by winds from the shorts of the shrinking Great Salt Lake that gets deposited over everything) that tends to cause power lines and insulators to get very noisy. Usually, rain/snow will clean this hardware - but this could also be part of the long-term degradation of the aging power infrastructure in the area.

26 January, 2025 - Thanks for everyone who stopped by and visited us at QuartzFest!

Thanks to everyone who stopped by at QuartzFest and chatted - even briefly. Seeing users face-to-face allowed us to talk about how they use the WebSDR, use different features of the WebSDR of which they might not be aware (e.g. signal level measurements and antenna comparisons, noise reduction, etc.) and get feedback about "quirks" - notably:

The "Apple" problem. This refers to the problem in which portable iOS devices (tablets, iPhones) go to "sleep" after about four minutes of not interacting with the device (e.g. touching the screen), causing the audio to stop. This is not a problem with the WebSDR, but rather the fact that the WebSDR is accessed via a Web Site rather than an app written for a specific purpose, which is why iTunes, the YouTube app, and other services accessed via an app don't have this problem.
"Locking" the frequency. A couple of people commented that it's a bit too easy to accidentally change the frequency when using the mouse - specifically if you happen to touch the scroll wheel when the mouse is near the waterfall.

We'll look into the above issues - and others that were mentioned - to see what we can do.

19-25 January, 2025 - At Quartzsite!

During the week of January 19th through the 25th some of the folks involved in maintaining the Northern Utah WebSDR will be at Quartzfest near Quartzsite, Arizona. Look for us just north of the "Welcome" tent (where you check in), stop by and say hi.

10-12 January, 2025 - Site work

During the days of 10-12 January, 2025 UTC there is the possibility of occasional outages of all servers during the course of various tasks:

Power infrastructure.

We added a new 50 amp circuit for the UPS. This will allow grid-charging of the UPS battery at a rate of 40 amps, which should fully-recharge the LiFePO4 battery bank (200 amp-hours at 48 volts) in a bit over five hours - this, while powering the load on the UPS.

A 50 amp, two-stage mains filter was installed to prevent RF interference from being conducted on the AC mains input to the UPS - an absolute necessity for a site with sensitive receivers! Such a filter was already in place for the AC output of the UPS.
A 50 amp "Bear Claw" outlet was installed to allow us to "plug in" the UPS input. The reason for this is to allow us to unplug the UPS in the event of a power failure and connect it to a generator via an adapter cable. The UPS configuration allows us to set the maximum AC mains input current to be appropriate to the generator that we might have available to us.
While not mains-related, a bit of clean-up of the DC power distribution (for amplifiers, receiver modules) was performed.
A test of the UPS was done, running the site on battery. We only ran this for about four hours, but past experience indicates that we can reasonably expect to run for 10-12 hours on battery, more than this if we were to shut down some hardware - something that we can do remotely.

RF infrastructure changes.

A low-noise, high-dynamic range preamplifier was added to the 6 meter feed at the tower. This unit also has post-amplifier, strong band-pass filtering to knock down ingress from a nearby FM broadcast station and other off-frequency signals.
Doing this has noticeably improved 6 meter reception on WebSDR #2 (Green) - using a CW beacon about 80 miles (130km) away as a reference.
The WSPRDaemon server - which uses an RX-888 to receive all of the LF, MF and HF spectrum was changed from a 64.8 to a 130 MHz sample rate to permit reception of 6 meters as well. An HF/VHF diplexer was added to the feed for the RX-888 to combine the existing HF signals with the 6 meter feed from the upgraded filter/amplifier and it was noted that 6 meter reception on the RX-888 was comparable to that on WebSDR #2.
There had been an extremely sharp band-pass filter installed on the 40 meter receiver of WebSDR #4 to prevent overload of the old receive hardware. This was removed as the current receiver hardware (which has been in service for over two years) is capable of handling the strong, out-of-band signals (41 meter SWBC) without overloading.

Supercapacitor UPS added

For WSPRDeamon processing - and possibly other uses in the future - we are starting to move toward "tiny" PCs (e.g. the sizes of the so-called "NUCs"). These have a problem: Their tiny power supplies don't have a lot of storage capacitance. We have discovered that even though our UPS transitions quite quickly, the power supply may not be able to "rid through" the brief glitch. A module using a 3.5 Farad capacitor was constructed that is plugged in between the computer and power supply, allowing mains power to be lost for well over a second (more than enough for the UPS to switch) without the PC rebooting/crashing.

Tower guy tension monitoring

It is now standard procedure to measure and record the outside temperature and the tension of the guy wires on the two antenna towers on site during each site visit. This will hopefully help us spot problems before they become problems! As we occasionally need to climb the towers, it's reassuring to know that they guy wires are actually doing their jobs.

Again, we then you for your support of the Northern Utah WebSDR!

26 December, 2024 - Weather-related network outages.

On this day network outages are likely due to winter weather in Northern Utah. Among other things, it has reduced the solar and wind power generation of the nearby wireless relay site that provides connectivity toward the Internet. We are doing what we can to minimize these interruptions.

19 November, 2024 - Apparent lightning strike - system anomalies.

On this day we got reports of receiver issues - namely the loss of 80 and 40 meters on WebSDR #1 and 10 meters on WebSDR #4. The receivers were either dead (black waterfall) or users heard a very load, recurring noise/chirp.
Looking at the network logs we could see an anomaly just after 0500 MT - and on a hunch we looked at the weather reports for that time period and saw that lightning had occurred in the area.
We suspect that there was a very nearby lightning strike that "glitched" a bunch of things - namely causing the USB connections on the receivers to be confused. Remotely, we weren't able to simply restart the individual receivers and, instead, had to restart the entire driver service for WebSDR #1 and do a computer reboot on WebSDR #4 to recover signals.
From what we can tell, there was no actual hardware damage - just scrambled bits, bytes and rearranged electrons.

18 November, 2024 - 40 Meter signal issues resolved and new UPS brought online.

40 Meter signal path fixed

As noted in the 17 November entry, 40 meter signals on WebSDR #1 would "fade out". Our local correspondent was able to make a site visit and discovered that the RF cable feeding the 40 meter receiver had become "flaky" (intermittent).

This cable was replaced, resolving the issue.

New UPS brought online.

During this visit, the new UPS system was brought online. This system consists of a Renogy RIV4835CSH1S-US - a 3500 watt, 48 volt Solar Inverter Charger coupled with a 48 volt, 200 amp-hour LiFePO4 battery bank which provides over 10kWh of energy storage.

While we don't (yet) have any solar input - which could be used to augment/offset mains power consumption - this unit has a built-in 40 amp charger meaning that it will relatively quickly top-off the batteries after the grid is restored, or while on generator. Recovering charge quickly is important if there are multiple, back-to-back power failures as a "slow" charging rate could result in loss of power as the battery might not be sufficiently recharged between events.
It has a power conversion efficiency of over 90% - far better than a typical UPS (which is likely to be in the 80% range) which will improve run-time.
Additionally, this device has a power factor of better than 0.9, it's much "friendlier" to a generator - particularly those of the "inverter" type.

As noted elsewhere we had previously constructed mains filters to contain RFI from the previous UPS system(s) and with those in place we could detect no QRM being generated by this unit above 100 kHz: We did observe low-level QRM at about 20 and 40 kHz when the unit was operating, but it was far weaker than that produced by the older UPSs: If it proves to be an issue, we'll install additional filtering.

17 November, 2024 - Random receiver signal loss issues.

Intermittent signal outages on WebSDR #1's 40 meter receiver.

On this day we noted that signals on the 40 meter receiver on WebSDR #1 (Yellow) were intermittently disappearing. The receiver was remotely reset to no avail indicating a likely cable/connector issue.
In the meantime there are TWO alternate 40 meter receivers available for use:

WebSDR #3 (Blue) - This is the "back-up" WebSDR, also on the Omni antenna. It uses low-performance RTL-SDRs, but it can still hear "pretty well" under typical band conditions.
WebSDR #4 (Magenta) This WebSDR uses the east-pointing beam.

Our local correspondent will investigate this issue as time permits.

Signal loss on WebSDR #5's 17 and 12 meter receivers.

It would appear that something glitched the 17 and 12 meter receivers on WebSDR #5 (Teal) - these were reset and brought back online. This issue is conincidental with - but unrelated to - the issues on the 40 meter receiver noted above.

13 November, 2024 - Network outage

In the very late hours of 13 November (MST) an outage occurred in an upstream provider (e.g. not related to our ISP, but "before" that) - likely related to issues related to "power maintenance" at a facility on the fiber network. Connectivity was restored within a few hours.

8-10 November, 2024 - Site visit.

During this weekend a number of projects were undertaken on site:
Building re-leveling.

The building for the WebSDR is a pre-fabricated communications trailer, but rather than sitting on the ground (which would be bad) it's sitting on several railroad sleepers (e.g. railroad ties) which, themselves, are sitting on the ground. Over the years, the ground is settling so the building was jacked up additional support was placed under the building and re-shimmed to being level. There's still work to do on this project to further-improve stability, but it's better than it was.

Additional work done on back-up power system.

The new "UPS" has been installed - but we were unsure of how, exactly, it operated (the manual wasn't clear) in terms of how it interacted between grid power and solar. It has the capability of charging from solar and/or the grid, offering the possibility of using little or no grid power when sufficient solar isolation was present to completely power the load - but the manual wasn't at all clear how, exactly, it determined when it was doing what.
To divine this, a 48 volt battery and some solar panels were brought on site to see how it behaved. We observed that it will it will work perfectly as a UPS, the switching between solar and grid power isn't quite as we'd like - but we tested a work-around that worked perfectly to allow solar to supplement (or even eliminate) grid load when sufficient sun is available while also charging the battery. During a grid outage, this means that we would be able to augment power from solar during daylight hours to increase run-time.
For the moment, the old UPS is still online pending the arrival of some cabling for the battery - which should arrive later this week - but we did determine that in normal AC operation it does not cause any QRM (interference). In testing with the solar, we observed some interference, but this was without the added filtering that we will be using when we get to that part of the project. This power system will be documented on its own web page when we get the system operational - but the solar portion will definitely be a project for next year.

Work to improve "10M Hi" reception.

At the moment the "10M Hi" receivers on WebSDRs #2 (Green), #4 (Magenta) and #5 (Teal) use RTL-SDRs with frequency converters and band-pass filtering. As RTL-SDRs really aren't suitable for high-performance HF use - particularly on the higher bands - these receivers are both noisy and deaf.
Testing has shown that it should be possible to reconfigure the existing "10M Lo" receiver hardware (using an RSP-1a) to also provide "10M Hi" reception with much improved performance - a project that is hoped to be completed (remotely) in the upcoming week or so, starting with WebSDR #5. This will result in interruptions of those WebSDRs, but attempts will be made to do this work in the late evenings, Utah time.

WSPRDaemon test computer replaced.

For the past several months a test computer and receiver (and RX-888) has been used for not only WSPR signal decoding and reporting, but it also contributes bona-fide scientific research to the HAMSCI "Personal space Weather Station" (PWS) project as well as decoding/reporting FT-8 and FT-4 signals on all HF bands. The computer used for this is a bit older and is barely able to handle the processor loading so a newer computer - one with a much faster processor and consumes less power - was brought online.
The old computer was reconfigured and will be used to expand the CW Skimmer operations at the Northern Utah WebSDR, allowing reception via the other antennas on site.

4 November, 2024 - Back on the grid, again.

On this day - according to our utility power monitor - the grid power was restored at about 1415 MT.
The word from the power company was that a cross arm on a power pole at the nearby substation had broken perhaps a week or so ago. At about that time there had likely been some power disturbances - which we may have observed in our logs. On Friday (1 November) someone happened to notice the problem and the power was cut pending repair. It's worth noting that these problems were occurring in a "private" substation - not one that is actually owned by the utility. The power feed to the WebSDR - and another customer - happens to pass through this substation, so issue at that site affect not just that owner.
It would seem that repairs were concluded yesterday, but it wasn't until today that final inspection was completed and the circuits re-energized .
To make sure that everything was stable - and also because he was busy until then - our local correspondent was able to put the WebSDR site back on utility power at around 1930.
Meanwhile, our old UPS is still online, but we are working toward commissioning our new UPS solution - details on that to be noted later.

3 November, 2024 - Still on generator power!

True to the power company's word, the utility power is still off - and we do not expect it to be back for another day or two (Monday/Tuesday 4/5 November). Local weather has blanketed the area with occasional heavy rains and snow which may slow the work.
In the meantime, we are still feeding the generator. With the current load - and the run-time of the new batteries - we need visit the site only about twice a day.

For reasons that we don't understand, while on generator the UPS will occasionally become unhappy and "glitch" the AC feeding the servers - sometimes causing one or more of the WebSDR servers to reboot. Since we are replacing the existing UPS system with something completely different (after utility power is restored) we are hoping that this problem will simply "go away".

1 November, 2024 - Extended utility power failure.

Around 1045 MT the utility power at the remote Northern Utah WebSDR site failed - but we didn't notice for quite a while. While we have a power failure monitor on the network stack, notifications somehow got turned off. Meanwhile, the key WebSDR personnel were off on a radio-related road trip for most of the day and otherwise occupied.
Fairly late in the evening it was noticed that the WebSDRs' up-time was only about 11 hours and 16 minutes indicating that they'd rebooted for some reason - and a quick check with the site logger showed that the power failure had occurred 11 hours and 16 minutes earlier: Apparently the UPS "chattered" during the power failure and caused all servers to reset.
This also meant that the WebSDR site had been on battery for 11 hours and 16 minutes - but this was only possible because we'd just replaced the failed lead-acid batteries with about 10 kWh of LiFePO4 batteries (see the 3 October, 2024 entry) - but with an average load of about 550-600 watts, this battery bank was at about 15% charge.
Observing this critical low power level we shut down all WSPR, CW skimmer and also WebSDRs #4 (Magenta) and #5 (Teal) to maximize the remaining run time.
As our "local correspondent" was also involved in the radio-related trip, he was also several hours away from the WebSDR site and being able to bring a generator online - but we don't expect that despite the "load shedding" that there is enough battery capacity to hold the site until then.
Meanwhile, a call was made to the power utility and they verified that our power meter offline, verifying that it was the utility power - not something in our building - that had failed.
A later update from the power utility indicated that something had failed in the substation - but the estimate for the replacement gear to arrive is in a few days - 4 November.
During the period of the utility outage, the remote Northern Utah WebSDR site will be on generator power. While best efforts will be made to keep it online, outages of some or all servers at this site are possible. (The "SCL Metro" WebSDR server will not be affected by this outage.)

21 October, 2024 - More utility power anomalies and WebSDR outage.

On this day we got an alert that the mains power had failed between 1425 and 1430 local time. Since our local correspondent was in the general area, he wandered over to the WebSDR site and verified that, in fact, the power was off.
It soon became apparent that the situation was more serious. A few months ago we'd installed a "whole house" MOV (surge suppressor) on one of our distribution panels - and the circuit breaker feeding this was tripped, indicating a severe overvoltage event. This was further indicated by the fact that a linear power supply had a blown primary fuse - and the power supply for a VOIP ATA was damaged.
It also became apparent that the UPS itself was damaged: Soon after arrival, our correspondence noticed a smell - shortly after the power came back on briefly - and the UPS failed entirely after that. This UPS was the replacement for the one that had been destroyed in May due to excess mains voltage.
This, of course, dumped all of the loads as there was no mains power available - but 2-4 minutes later - at around 1520 local time - the mains power came back online.
For the time-being, a "spare" UPS (one that was replaced last year when it showed signs that it was starting to fail) was pressed into service again.
We are looking into a different UPS scheme - one that will be more efficient and robust in light of the fact that several UPSs have now been damaged/destroyed by "anomalies" from the power mains.

3 October, 2024 - New batteries installed.

On this day the LiFePO4 batteries that had been ordered earlier were installed, restoring a modicum of run time on back-up.
At present the configuration of the "bulk charger" system is still being finalized to accommodate the new batteries and their voltage requirements - which are somewhat different from Lead Acid - so the bank is not yet up to full capacity, but this is a work in progress.
When fully online, the upgraded UPS system will have well over twice the capacity of the previous lead-acid battery bank (when it was new and at capacity) and the "bulk charger" capacity will also be doubled, permitting a faster recharge rate when power is restored or the system is on generator: It's estimated that this battery bank will be capable of storing approximately 10.8 kWh.

21-22 September, 2024 - Site Visit.

UPS mains filter

As noted in the 5-7 July, 2024 entry we had observed that RFI was being generated by our new UPS across the HF spectrum and, most notably, below 100 kHz. The most visible manifestation of this is around 20 kHz and the immediate harmonics where you may see(via KiwiSDR #1 or #2) an intermittent signal that is the UPS's battery charge:r: If charging the battery, it was continuous, but at full charge it became intermittent. Once recognized, this signature could be seen at several places below 2 MHz.
From a different circuit, a low-level "power line" noise was also being produced by the UPS - whether it was active or not - across the upper HF spectrum. It was pretty low-level, being most noticeable on WebSDR #5 (Teal) which has its beam pointing directly at the building, but it was also getting into other receivers at a low level and only easily observed by "on/off" comparisons of the UPS.
As is typical of such things, these noise sources were being conducted via the power connections - both the AC input to the UPS and its output and NOT by being radiated: After all, a meter or two of power cord and wire inside a metal building isn't really going to radiate much on HF - not to mention LF! The "fix" is therefore to add more filtering to the AC power in/out.
In addition to the UPS in/out, there is a third power connection: As the UPS is capable of charging only at an amp or two, it would literally take over a week to fully charge the battery bank (nominally 100+ amp-hours, but more on this in a moment) so we added a 15 amp charger in parallel with the battery bank. The reason for this is that, in the past, we'd had power failures in rapid succession that with the built-in UPS charge, we could never "gain ground" and would deplete the battery bank - even if the power was on most of the time. By adding the "bulk charger" the battery bank could be fully recharged in under 10 hours - particularly useful when we were on generator as it more heavily-loaded it (a bit more efficient, perhaps) and the greater charge level would allow the UPS to run for a reasonable amount of time even if the generator stopped.
To this end a 10"x10"x4" steel utility box was obtained and in it three A/C mains filters were installed. At HF, these filters are rated to knock down conducted emissions by 30-50dB (both common-mode and differential). Essentially, this box has three power cords and three outlets into which the different devices are plugged, and since all of the mains-connected cables related to the UPS go through this one box with filters, circulating RF currents are contained within its chassis and cannot find there way onto the power source or the load.
This filter box has quashed the generated noise at HF that was being detected by the outside antennas, but it only had a slight effect on the generated RF below a few hundred kHz - but this was to be expected as these filters simply weren't designed to be effective at these low frequencies: The 20 kHz signal is reduced by about 4 dB and it becomes invisible above 150 kHz or so - about the frequency where a typical mains EMI filter starts to become effective. In the future, additional filtering will be added to the (now-existing) box that is specifically designed to work at low frequencies (below 100 kHz) - although it may not be necessary with the battery replacement (see below).
It's also worth noting that such power line filtering can offer a degree of protection to mains-conducted EMP (e.g. lightning, utility switching) - particularly from the standpoint of minimizing differential RF/EM energy that might appear differentially across the UPS's AC input and output.

"Badderies"

During the noise testing of the UPS we "discovered" that the UPS would run for only 1-2 minutes on battery. Grabbing the meter, we could see that the voltage would sink below 24 volts - likely closer to 23.8 volts at the UPS itself - and the UPS would shut off: Clearly, this was unacceptable - and unusable for any but very brief power outages/brownouts.
This behavior was puzzling because these batteries - four 6 volt "golf cart" deep cycle - were purchased and installed in June, 2022 and we would not expect batteries that were just two years old to behave badly - and we'd observed them being able to run for several hours during the May, 2024 power issues. Wielding a hydrometer, the specific gravity showed an 80% charge or better. Reconfiguring the "bulk charger" to output about 29.2 volts versus its normal 27.4 volts we observed that the current quickly went to zero, further indicating that the batteries seemed to be fully charged.
Using a voltmeter, we then measured the voltage across each of the 6 volt batteries and found that they tracked within a few 10s of millivolts even during discharge: What we were expecting was that there would be one battery in the bunch that was obviously bad, but it seems that they were all equally awful, pointing the finger toward a bad batch of batteries (e.g. a manufacturing, quality control and/or materials processing problem). A quick check online for batteries related to this same supplier indicated that we weren't alone - others had experienced similar, short lifetime for their batteries, noting that they, too, became unusable after "about 2 years". Normally, we would expect these batteries - which are not allowed to get terribly hot and aren't cycled excessively - to be useful for 4-5 years.
For the short term we "borrowed" two 12 volt 100 amp-hour AGM batteries (which are about 7 years old) and placed them in parallel with the extant battery bank to improve the run time.
If you have priced 6 volt golf cart lead-acid batteries recently you'll note that they cost roughly the same as the current generation of LiFePO4 batteries, so we are switching from lead acid batteries to that technology. The big "gotcha" with any current lithium battery technology is that they cannot be charged if they are below 32F (0C) which means that these batteries have a built-in heater.
To accommodate the higher float voltage of the LiFePO4 batteries - and the power drain from the heaters - we will add a second 15 amp bulk charger and readjust their output voltage from the current 27.4 to 29.0 volts. We will also be adding an insulated "battery box" at some point to reduce the heater drain - but design it such that it will also be suitable during warmer weather.

With the higher "float" voltage of the Lithium chemistry it may be that the UPS's onboard charger will never activate during float charging, being active only when the battery bank is charging due to a power outage. If this is the case this would mean that the 20 kHz (and harmonics) will be present infrequently. Even so, we may still add such filtering as future incarnations of the power systems may also generate energy in the LF/VLF region.

From a practical stand point, a LiFePO4 battery has roughly twice the usable capacity as an equally-rated lead-acid battery owing to Peukert's law - link - which notes that for a 100 amp-hour lead-acid battery, you can probably get 1 amp for 100 hours, but if you try pulling 100 amps, you'll get much less capacity overall - likely something closer to 20-40 amp-hours. A LiFePO4 battery, on the other hand, is more "ideal" in that if you tried pulling 100 amps from a 100 amp-hour battery, you'd likely get something in the area of 90 amp hours for a good-quality battery in reasonable health. As our UPS load is in the area of 45-50 amps at 24 volts, you can see that we'll be way ahead with the lithium chemistry. Owning some LiFePO4 batteries that are well over a decade old, they are still usable, albeit at only around 70% of their original capacity - but any lead-acid batteries of that same age have likely been long recycled.
In the meantime, we have ordered the LiFePO4 replacements, and we expect that they will be online within the next two weeks - depending on when they arrive and our schedules.
A (minor) complication of almost all rechargeable lithium chemistries is that they cannot be charged at temperatures that are below the freezing point of water (32F, 0C). While this can be a significant issue for some usages of lithium batteries (e.g. RVs in cold climate, remote radio sites, anywhere that gets very cold) the fact that we'll be using these batteries in a (somewhat) insulated building with computers helps. The batteries that we have chosen include built-in heaters which will take additional power and if we are not careful, this power could seriously compromise the run time of the UPS (e.g. bulk charging current being used for heating rather than charging). For this reason we'll be considering ways that we can insulate the batteries to minimize their need for self heating while not causing issues during the summer months when we will want to keep the batteries as cool as possible.
The upkeep, maintenance and upgrades of the Northern Utah WebSDR are only possible due to the generous support of our donors!

More work on the porch

In the 11-13 May 2024 entry we mentioned replacing the rotting, wooden porch of the building with cinder blocks and pavers and while this has worked well, we (expectedly) observed that the pavers on the surface would "walk" about a bit with foot traffic and thermal cycling - those at the edge working their way off, requiring us to occasionally kick them back into place.
On this trip a bit of urethane adhesive was applied to both the plastic pad (between the blocks and the pavers) and the blocks and pavers to anchor them into place. This adhesive is quite flexible - and will remain so - hopefully allowing things to move around a slight amount over time and with varying conditions.

Chainsaws and antennas

As noted in the 10-12 September entry, there was a wild fire not too far away (about 15 miles/22km) and that got us thinking about how well the Utah WebSDR site would fare in a fire. Fortunately, the building is metal surrounded by light grass that would very quickly burn off, but in the field with the antennas there are clumps of greasewood and sagebrush - some of the larger ones surrounding the guy anchors for the TCI-530's tower. These are particularly large as they were not removed when the acreage was last "chained" about a decade ago as they were too close to the tower/anchors.
To that end we have spent some time with a chainsaw, lopper shears and a rake to cut down those clumps: The worry is that these bushes, if they burned, could damage the guy wires themselves (weakening the wire at the very least - destroying the rust-preventing coating/insulators as well). For this trip, we ran out of time and only cleared the worst offenders so there is more work to be done.

10-12 September, 2024 - Various issues.

Internet connectivity issues - but not at the WebSDR!

In this period there have been scattered reports of users having trouble connecting to the Utah WebSDR - but this is NOT an issue related to the WebSDR as such. It would seem that there are large-scale issues across North America (mostly in the west) and have mostly been manifest by issues with DNS resolution - that is, the ability to turn the host name (e.g. "sdrutah.org") into the numerical address that the computer needs to connect to the destination.

What this means is that some users may have trouble connecting to some web sites: Some may work normally, some may not - and this may change over time - and this may depend on your Internet provider and/or the network that you are using. For example, people have been reporting that they cannot connect via their home Internet, but that their phone works OK - or vice-versa: The fact that any devices work at all in a given instant point toward the fact that the Utah WebSDR - and other sites - are up and running, but that network "difficulties" may prevent your connection from being established.

As of the time of this writing, the reasons for these network difficulties has not be explained - nor have the reasons why these network instabilities have continued for well over 24 hours.

Utility power issues caused by wildfire

A nearby wildfire resulted in the local power utility shutting down commercial power in the area. During this time a generator was deployed on site to maintain service. The duration of this outage was roughly 24 hours and we managed to keep everything online during this period.

KiwiSDR shuffle

KiwiSDRs #3 and #4 were "antenna swapped" - that is, #4, which was on the east-pointing beam is now on the omni and #3 - formerly on the omni, is now on the east-pointing beam.
This was done in anticipation of a soon-to-happen reconfiguration of the WSPRDaemon system on site which currently uses a single RX-888(Mk2) receiver for all-band (2200-10 meter) WSPR decoding using the omni: For many months, this has been operating independently (using a different callsign for WSPR reporting) and since the hardware has proven itself and the software has improved, the performance of the RX-888 based system is equal to or greater than that of the KiwiSDRs.
Once this change has been done, all WSPR decoding using the Omni will be moved off the KiwiSDRs, freeing more channels for general use.

630 meter receiver problems?

We got a report indicating that there may have been an issue with reception on 630 meters (WSPR, specifically). There have been no known issues related to this as the review of past logs do not show an interruption.
It should be remembered that the lower bands (2200, 630, 160 and 80 meters) are VERY strongly affected by lightning static. While this plays havoc with SSB and CW, it is somewhat less affecting of digital modes like WSPR.

Note: There was an attempt to mention the issues with the utility power and the report of possible 630 meter issues on the Northern Utah WebSDR Facebook group, but the post got deleted by the administrators for reasons that have yet to be explained.

It should be noted that none of the the volunteers that administer the Facebook group are any of those that actually operate/manage the Northern Utah WebSDR. We thank them for their work, but note that they operate independently.
THIS web page is always going to be the official and authoritative source of news and policies related to the Northern Utah WebSDR.

19 August, 2024 - Lightning-induced network outages

This summer has had some "interesting" weather in Northern Utah and more of this occurred this evening in the form of very strong and violent lightning and rain storms - including one this evening. This storm - and those in the days preceding - have wreaked havoc in the communities surrounding the WebSDR, including at least one lightning-related death in addition to many power failures.
As you probably know, unlike a home QTH - where you can disconnect the coaxial cables from your antenna (and throw them out the window?) if bad weather approaches, there's no practical way to do the same thing at the remove WebSDR site whenever there are black clouds. Instead, we have to employ strong lightning protection on both the RF feeds and the mains power. If you have been following this Latest News page for the past several years you'll already know that we have expended significant time and expense to do so, having installed a bonded/grounded cable entry to the (metal) building, improving grounding of the towers and adding even more ground rods to the building itself. The result of this is that we experienced little/no damage since then - even when there is evidence that something at/near the WebSDR receive site has been directly or very nearly hit.
Even though we've been spared damaged, this doesn't mean that there aren't effects. On this day we experienced some disruption when very nearby (or direct) lightning strikes (no-one was there to see them) caused on-site computers to do some odd things. Specifically, the network went down for a few minutes, kicking off all WebSDR users as it went through a reboot cycle: Our logs indicate that we didn't lose power - and none of the public-facing devices (WebSDRs, KiwiSDRs) appear to have reset.
In addition to this, some hardware (e.g. some of the computers used for WSPR monitoring, the CW skimmer) are connected to a remote control outlet strip and this seems to have turned off its loads at the same time - but they were successfully powered up again via remote control and the attached devices restarted normally and WSPR and CW reporting resumed.
Again we thank everyone who donates and supports the Northern Utah WebSDR: It wouldn't have been possible to put together a robust system otherwise. While we don't believe that we have a "lightning proof" installation (such a thing is likely not possible) we know from experience that it's survived a number of assaults thrown at it by Mother Nature.

13 August, 2024 - The Northern Utah WebSDR is now reporting FT4 and FT8 spots to "PSK Reporter" and various scientific endeavors and monitoring.

Ongoing scientific research. As you may (or may not) know, one of the activities going on at the Northern Utah WebSDR is the collection of bona-fide scientific data related to signal propagation. Mostly hinged around the use of the WSPRDaemon software, this data includes:

WSPR and FST4W reception. Reception of these signals is done using all three of the HF antennas and the E-field whip to report on all bands 2200-10 meters. This data includes how the signals differ from the various antennas as well as other information that is not recorded to the WSPRNET database, but is available in the WSPRDaemon database and this data - as well as that from other WSPRDaemon sites around the world - are used by researchers across the globe. This data is currently reported using the callsigns "ka7oei-1" which uses all available antennas for 2200-10 meter HF reception via KiwiSDRs but also the experimental "ka7oei/q" which uses a single GPS-referenced RX-888 (Mk2) receiver connected to the LF/MF/HF omni antennas. At some point we'll roll out RX-888-based receivers on all antennas to improve performance and simplify the hardware overall.
Noise data. While it might seem odd to log noise, the fact that - for the most part - the Northern Utah WebSDR is devoid of local, man made noise it's possible to keep track of the "natural" noise floor across the various LF, MF and HF amateur bands which consists mostly of that produced in the ionosphere. This, too, is used by researchers.
GRAPE data. The "GRAPE" PSWS (Personal Space Weather Station) project collects high-quality data regarding propagation of several known and reliable HF signal sources - namely WWV/H in Colorado and Canada. This consists of high resolution I/Q data which contains phase and amplitude information from GPS-referenced receivers - and this data is collected 24/7 from all of the WWV/H and CHU frequencies. This data is helping researchers uncover hitherto unseen properties of HF propagation as well as providing correlative data that may be analyzed with other types of information to help glean details about the many still-remaining mysteries of our ionosphere and Earth-space environment. The HamSCI GRAPE Web Site - link.

Not only does it make sense to leverage the unique ability of the Northern Utah WebSDR site to help gather this information, it also helps justify our existence as an IRS 501(c)3 organization - and all of the data that we provide is made available freely.

CW Skimmer reporting. Using (mostly) the main omni antenna, there are active CW skimmers on the 630, 160, 80, 40, 30, 20, 17, 12 and 10 meter amateur bands reporting using the callsign "ka7oei" (it doesn't allow suffixes). The combination of the quiet site and large antennas makes this one of the more sensitive skimmers around.
FT4/8 reporting added. In the past week or so the ability of WSPRDaemon to also collect and post FT4/FT8 spots to the site PSK Reporter site (link) also using the "ka7oei/q" callsign as this is also sourced from the RX-888 receiver on the omni.
If you are interested in more information about the above, have interest in the aforementioned research, have your own well thought-out ideas for research - or the Northern Utah WebSDR in general - you may find contact information on the "About" page linked from the bottom of this page.

Making a tension measurement on one of the guy wires for the tower supporting the two Log Periodic beam antennas at the Northern Utah WebSDR's remote receive site.
Click on the image for a larger version.

10 July, 2024 - Issues with "CatSync" again - maybe?

We were made aware that some users of the "CatSync" program may be having issues using it with the Northern Utah WebSDR, the problem being that the frequency being displayed is incorrect. In the past, this was (apparently) due to CatSync not being able to parse the 10 Hz digit of the displayed frequency.

We remind users that if they need to suppress the 10 Hz digit that they should include "?10hz" at the end of the URL, as in: http://websdr4.sdrutah.org:8904/?tune=7200lsb?10hz

We don't know what may have changed to cause this recent incompatibility: We worked with the author of CatSync in July, 2022 to understand the problem and believed that it had been solved - but it seems as though "something" has again happened. Absolutely no changes have been made to the way the Northern Utah WebSDR presents the frequency in the two years since we first heard of this issue and added the "?10hz" option.
We are most certainly are not interested in making the Northern Utah WebSDR incompatible with CatSync so we are at a loss to know what may have transpired in the meantime.

Unfortunately, we don't have any recent version of CatSync with which we can test to help analyze this problem to verify which version(s) may/may not have problems - we only get indirect reports from users of CatSync that there may be some sort of problem.
If you are experiencing issues with CatSync, please use the contact information found on the "About this WebSDR and contact info" page to comment/report on them.

5-7 July, 2024 - Site visit

A work party occurred during this weekend to take care of ongoing projects:

Mobile versions of the WebSDR page modified - now working probably, we think.

At some point in the past year or so it seems as though the "mobile" versions of the WebSDR page became broken - sort of.

On some devices (e.g. computers) everything was fine, but on other devices (some phones - notably Android) the keyboard frequency entry quit working. What this meant was that while one could slide the waterfall back and forth to tune the frequency, typing in the frequency didn't work: This not only prevented one from manually entering the frequency, but also changing to another amateur band.
Unfortunately, debugging on a mobile device is very awkward compared to on a desktop: Desktop browsers actually have built-in debugging tools - but these tools are minimal or missing on standard mobile device installations. After a bit of going back-and-forth and testing, the problem was found and fixed. Again, there was never a problem on desktop devices and some other types, but this was definitely the case on Android mobile devices!

VLF/LF receive signal path working again - we hope.

For the past several months (since March) the LF/VLF signal path was unusable more often that it was usable with strong oscillations clobbering most of the spectrum. What this meant was that the 2200 meter receiver on WebSDR #1 and frequencies below about 350 kHz on KiwiSDRs 1-3 were unusable. As the summer months are typically very noisy with minimal 2200 meter activity there was no great rush to get it working - plus, we can only do some much during any given site visit.
The problem? It appears that a patch cable had an intermittent shield causing some sort of interaction with the common-mode chokes and the power supply causing the oscillation.
We also observed that at around 20 kHz and harmonics out to hundreds of kHz there was an intermittent signal source. This was tracked down as being caused by the float charger in the UPS itself: It apparently has a switching regulator of some sort that operates at 20 kHz that is used as the primary battery charger circuit.

We also observed that the UPS was generating some "hash" at HF frequencies - possibly being picked up by WebSDR #5 (Teal) as its northwest-pointing beam is directed more or less at the building. We plan on installing filtering on a future trip to mitigate this. It is very unlikely that this noise is radiated, but rather conducted into the power mains - and once there, it will get into everything!

Power mains surge suppressor installed.

With the recent lightning damage and "oops" from the utility that put >500 volts on the 120 volt circuits (see the 29 May, 2024 entry), the installation of this may reduce equipment damage due to such activities: Hopefully this won't be more of a liability than a help!

Conductivity of lightning grounds enhanced.

In this area - desert and dry ground - there is a the need to imbue the soil surrounding the ground rods with additional salts and minerals to improve the ionic concentration - and one ready source of this is produced from fluid that has been processed by nephrological structures. The hot weather has reinforced the constant need to maintain osmotic balances via onboarding of non-polar liquids and this - coupled with specific targeting of the expellation of the excess - has contributed to this cause.

Network modifications.

Some brief outage were necessary to make network configuration changes - mostly related to isolating different types of devices to their own segments and limiting how they connect to each other, if at all.

Power distribution changes.

More outages were required when we re-did some of the AC power distribution from the UPS to reduce the possibility of a tangle of power cords to feed different pieces of equipments and racks. Unfortunately, we haven't found an easy way to permit a server to be powered when it is unplugged!

Tower guy wires - tension check/adjustment.

After having used the remote WebSDR site for several years, we decided to get a proper guy wire tension meter - this being possible with the generous donations of our supporters.
Having two towers on site, it would make sense that we should know what the guy tensions were, adjust them as necessary. Up to this point, we've only set the tensions very approximately by noting their resonance frequency - and identical wires (length, composition) should vibrate at about the same frequency.
80 foot tower:

The first tower we measured was the 80 foot tower with the two log periodic antennas. Overall, the tension was increased significantly - but more importantly, they are all within a few percent of being equal - particularly importance since the upper guy wires on this tower connect to torque triangles near the top to counter the twisting of the large antenna in the wind.

TCI 530 omni.

This antenna has a LOT guy wires since it's essentially a wire antenna held up by a tower. The upper tower guys were set to within a few percent of each other (around 2500 pounds) while the lower guys were set to be the same.
There are also four upper guy wires to hold the antenna wires' catenaries under tension and these were equalized - the tension being set to around 1600 pounds. Much of this tension is not against a single point of the tower, per se, but to hold aloft the log period wire arrays which are connected/anchored at many points on the tower structure and to other wires of the array.
The four lower antenna guys are less critical as they pretty much hold the bottom of the log period wire arrays away from the tower and pull them downwards toward the ground. These are at a very much lower tension (around 180 pounds) as their purpose is pretty much to keep the wires from flapping around in the wind. These, too, were equalized and a visual inspection was done to make sure that tightening did not result in visible asymmetry of the arrays due to unequal pulling.

With the tension meter now available, we'll do routine checks of the guy wire tensions. This is particularly important for the 80 foot tower as it has fewer - and more critical - anchor points:

Unlike the TCI-530 - which could lose any single guy wire and not compromise the structural integrity (e.g. even if it's functionality was impaired, it wouldn't be significantly damaged or fall down - even in high winds) the loss of any guy anchor on the 80 foot tower could result in its destruction. As we have had issues with the guy (deadman) anchors before on this tower (as the back history of this web page will show) we are understandably paranoid: Quarterly (or even more frequent!) measurements of tension should reveal problems before they become serious.

5 June, 2024 - Updates

UPS actually installed

As it turns out, our local correspondent was not able to get to the WebSDR receive site to install the new UPS yesterday - but he did today, without incident: We have a way to transfer the load (the servers and radios) so that we can swap out the UPS without interrupting anything: That mechanism worked as it should.

WebSDR #2 "10M Hi" receiver back in operation

As expected, it took a "re-plug" of the RTL-SDR for the 10M Hi receiver to bring it back online. Unfortunately, this "reset" also included the need to restart the WebSDR server, so everyone got kicked off for a few minutes - but that's unfortunately the way it works.

A bit more investigation of the LF signal branch

While our correspondent was on site, he adjusted the supply voltage for the <350 kHz signal branch (see the 4 June entry, below). The thought was that maybe the regulator was oscillating and if it was, adjusting the supply voltage above/below the drop-out voltage should have had effect. It did not, so further on-site investigation is in our future.

4 June, 2024 - WebSDR now back on UPS

Back on backup!

As noted in the 29 May, 2024 entry, a mishap on the utility side of the mains power destroyed our UPS - and today, the replacement UPS arrived and was installed.

Other ongoing issues:

WebSDR #2 - "10M Hi" receiver unusable.

At the moment the "10M Hi" receiver on WebSDR #2 is unusable. All that you'll hear until we fix it will be a melange of raucous tones and NO actual signals.

LF (<350 kHz) receive signal path severely degraded

Although we thought that we MAY have fixed it, the signal path for all below 350 kHz (on the KiwiSDRs and on the 2200 meter receiver on WebSDR #1 (Yellow)) is still suffering from oscillations that are making it nearly unusable. We think that it may be oscillations due to a voltage regulator in the multicoupler/amplifier "breaking into song" - likely due to an electrolytic capacitor that has failed - but that's only a guess.

We'll address the ongoing issues as time permits: It's expected that the "10M Hi" receiver will be resolved first, but the LF receiver signal path issues will likely have to wait for several weeks.

30 May, 2024 - WebSDR site power restored, no UPS available for now

Late in the evening of 29 May, the power to the WebSDR site was restored - sort of.

As it turns out, there were a number of fuses blown here and there in the run from the main step-down transformer to our site and it took a bit of work on the part of the power utility to find and replace/repair as needed.
Once the power was restored it was discovered that our building was missing one phase, which did not get restored until early this morning. In other words, the "crossing of the power busses" resulting from a contractor's temporary lash-up failing - resulting in a pole falling over at the pump station - must have sent a very high voltage down the line, indeed: We think that the 47kV distribution line may have been momentarily connected to the 12kV line that feeds our site.

As noted in the 29 May entry, this destroyed our UPS, but it did its job to protect the devices that it powered: Nothing on the output of the UPS seems to have been damaged - which includes some network gear, the WebSDR servers themselves and various power supplies that feed amplifiers, etc.

The items NOT on the UPS that were damaged include the bug zapper (necessary for this location!), the building's ventilation fan and a few other "bits and bobs". As it turns out, most of the items that were NOT on UPS that were not powered down were damaged: Things like the lights, heater, air conditioner were either off or on circuits with open breakers (we shut off non-critical circuits when we leave the site) seem to have been spared. We fully expect to fine a few more items that were damaged as time goes on.

This morning when the power was fully restored, most of the WebSDRs came up normally, except:

WebSDR #2, did not come back up initially and it seemed to be having a problem initializing the RTL-SDR for the 10 meter "High" receiver. A bit of poking around (and no issues really being found) the system finally come up normally after a reboot which likely did a proper reset for the RTL-SDR hardware.
When WebSDR #2 it did come online there were no signals on 30-10 meters (6 meter signals were not affected) owing to the loss of the 12 volt power bus used to run converters and amplifiers - and the loss of this bus also meant that the KiwiSDRs had no signals, either: This latter issue was not related to the surge and was quickly repaired by our local correspondent.

In the meantime we have NO UPS at all meaning that even brief power bumps are likely to take the WebSDR servers down until they can restart: The network has its own, separate battery backup and should be unaffected which should allow us to remotely determine the state of the utility power. As noted in the 29 May entry, we expect to receive a replacement UPS and should be able to get it back online in a week or so.

29 May, 2024 - WebSDR site power failure: All WebSDRs knocked offline - WebSDR #1 up "temporarily".

For those who have been following along, you may recall that the 23-24 March entry described a power outage due to some catastrophic failure along the lines feeding the WebSDR site. At that time, wind had knocked over a power pole at the nearby pumping station (where the step-down transformer that feeds our site resides) causing extended outages.
Well, it happened again: The same pole - which was apparently not well-set by the contractor in March - fell over again in a wind storm yesterday/today, causing a power outage - and more!

It would seem that different-voltage buswork made contact with each other, sending an unknown amount of voltage downstream.

One of the results of this transient was that the power meter at the WebSDR site now had the inside of its clear, plastic was now somewhat opaque, apparently covered with smoke residue: As power meters are (presumably) designed to take at least some abuse, this artifact indicates that something really bad happened.

The UPS did not switch in, but an analysis of the error codes it is throwing indicates that it has been "blowed up real good" by what was apparently a very substantial voltage transient on the line input that damaged it severely - but that its on-board processor still functioned.
The loss of the UPS and subsequent power failure meant that the entire site went dark: This happened at approximately 6:20:48 AM MDT.
Unfortunately, our local correspondent does not have an available back-up generator today as all of those to which he has access are in use on other sites that are experiencing/expecting power outages/
In the mean time - as of approximately 10:30 AM MDT - WebSDR #1 and its peripherals are being powered by the UPS battery bank and an inverter that he happened to have in his car (as one does!) - but this rather small (125 VA) inverter cannot run any more equipment than just a single WebSDR and the network gear.

Expect interruptions of this WebSDR as this is a temporary arrangement, likely to be restarted when it's switched back to mains power.

When the commercial power returns, there will be NO UPS available for the time-being as this unit has been damaged: The manufacturer of the UPS (Eaton) has indicated that they'll do a warranty swap and we'll be sending this UPS to one of their engineers for failure analysis.
In the meantime, we don't think that anything else has been damaged, but we won't find that out for certain until the mains power returns.

11-13 May, 2024 - WebSDR site work.

During this weekend, several projects were undertaken and issues resolved - hopefully. These included:

Resolution of signal issues on the VLF/LF signal path.

Roughly coincident with an extremely close lightning strike (see the March 26, 2024 entry) the 0-300 kHz signal path became intermittent - the expected signals replaced with what appeared to be very strong, raucous oscillations across the spectrum - but the issue was, as problems often are, intermittent: It sometimes worked fine, but usually not.
The original suspect was the power supply, but this was quickly ruled out (by replacing it!) and we discovered that it would seem to go away when we disconnected and reconnected a feed going to the entry box. On the presumption that this indicated a flaky connection on the center pin of the coax, all reachable connectors in the signal path (excepting the one on the tower - I did not bring climbing gear this time) were removed and exercised. We'll see if this "fixes" it.

Upgrade of the 6 meter receiver on WebSDR #2.

As mentioned several times in the "Technical" sections of the Northern Utah WebSDR web page, it is our opinion that 8 bit SDR receivers like the RTL-SDR and some versions of the FunCube are arguably unsuitable for any sort of situation where there are both weak and strong signals simultaneously - which is why we actually mark all receivers using those as "Low Performance" (e.g. the receiver/band designation is NOT in bold for RTL-SDRs.) For those who have been following the Utah SDR for several years will note that we have removed several of our RTL-SDRs from service and replaced them with "proper" hardware and in the cases where we have not done this we have always used good band-pass filtering to help preserve the signal integrity as much as possible - and in other cases we have also preceded the RTL-SDRs with outboard AGC circuits in an attempt to make them work as well as is practical.
As a continuing effort, we have replaced the 6 Meter RTL-SDR on WebSDR with an SDRPlay RSP2-Pro that was donated to us: This receiver has proper hardware AGC, some band-pass filtering, and about 14 bits of acquisition depth - the same as an Icom IC-7300. The only "downside" is that the usable band coverage on 6 meters had to be reduced from 1 MHz to a bit over 600 kHz, centered on 50.3 MHz. The result, however, is that the RMDR of this receiver is now greatly improved and signals that had been previously masked by the receiver's own noise are much more likely to be heard.

Other activities:

Towers, guying and antennas inspected. Braving clouds of mosquitoes (the site is adjacent to a bird wildlife refuge with lots of water - and there are cattle all around the area) the guy lines and deadmen on the towers were inspected and a careful look was taken at the antennas. Fortunately, even though we've had high winds over the winter and spring - and a lightning strike - nothing seems to be amiss and all is working well.
Porch replaced. When we brought the WebSDR online in February 2018, the "porch" by the door was not in any condition to stand on so a random piece of 4x8 interior plywood was laid over the top of what was there (two railroad ties and rotting wood) and screwed down. Last summer we started having to be very careful where we stepped as our foot could have easily gone through the badly-deteriorated wood - and this could very easily result in someone getting badly injured. On 5/13 the old porch was removed (using a sledge hammer - among other things) and the remaining debris removed. After this, the ground was excavated somewhat and flattened - sloping away from the building - and then a bed of sand/aggregate mix was laid down. Atop this was laid a grid of cinder blogs (to raise the level of the porch to an appropriate stepping height into the door of the building) and concrete pavers were laid atop those. Further work needs to be done on this (e.g. readjusting block leveling, adding some rubber matting under the pavers) but the result is a far more substantial structure (using more than a ton of material!) that isn't likely to be a hazard - and it should last a long time, and be repairable. A related project that is upcoming is to replace the supports for the south side of the building as the ground has settled a bit and the old wooden support structure on which the steel rail sits is also deteriorating

1 April, 2024 - Brief outage and WebSDR issues with some Apple users.

Brief outage:

A brief loss of Internet connectivity occurred when upstream - at a fiber landing - an electrician accidentally sent 277 volts into 120 volt circuits during a replacement/upgrade of some power distribution gear, causing the immediate destruction of a "surge-protected" distribution block and the subsequent tripping of the related circuit breaker(s). Aside from the now-destroyed protection device, there was (fortunately) only minor damage to other gear related to the data connection and connectivity was immediately restored.

Some Apple users report no audio/waterfall after an update to iOS 7.14.1

In late March we started getting scattered reports that users of some Apple devices were no longer able to access ANY WebSDR at all after an upgrade to iOS 17.4.1. The symptom was that the page would seem to load, but there was no audio and no waterfall data.
After a bit of sleuthing as well as research by the Apple folks themselves, it was determined that this upgrade interacted with an installation of Norton 360 VPN.
The "fix": This issue was resolved by uninstalling Norton 360 completely and noting that access to WebSDRs was restored. After a subsequent reinstallation of '360, WebSDR access still worked.

27 March, 2024 - General update (Power and eclipse)

Site power:

Although commercial power was restored on 25 March, there have been a few minor interruptions since then related to the concluding work - mostly related to testing the new UPS unit.

Eclipse-related things:

As you surely know by now, there will be a total solar eclipse (that's the one where the moon blocks the sun) on 8 April, 2024. At the Northern Utah WebSDR's remote site, the amount of "obscuration" will be around 46% at around 1230 MDT (1833 UTC) - but enough to make the environs look "strange" and affect propagation - particularly from signals that emanate from and beyond the other side of the path of totality.
We have on site a number of GPS-locked receivers operating that should produce excellent, research-quality data not only during the eclipse, but also for periods of time before and after: As stability and precision will be within a few milliHertz it should be possible to analyze both the absolute frequency of received transmissions due to Doppler shift, but also other aspects of the signal, including Doppler spread and absolute signal level at the antenna terminals.
While the main emphasis will be on WSPR reception - which, when properly configured includes frequency and Doppler information - but spectral recordings will be made, including:

Recordings of a few kHz around the WSPR frequencies
Narrow and kHz-wide recordings around the WWV/H, WWVB and CHU time stations
A "wideband" recording that will include the entire spectrum from a few kHz through 10 meters. (Yes, that will be terrabytes of data!)
The amateur band and "wideband" recordings above will also include locally-generated GPS-based frequency and absolute time references.

Why do this monitoring? There are several compelling reasons:

Hams are usually beset with scientific curiosity: All of this is fun to do!
The Utah SDR receive location has, in the past, been used for scientific research - and we are pleased to continue this tradition.
As a 501(c)3 non-profit organization, it is incumbent on us to include bona-fide scientific research and collaboration to help justify our non-profit status.
We are testing new software/hardware/techniques that are at the cutting edge of software-defined radio technology that should not only go toward scientific progress, but also the technical progression within amateur radio itself - right in line with the Basis and Purpose section in FCC's part 97 rules.
This same hardware is candidate for future upgrades/enhancements of the Utah SDR site's receivers.

Meanwhile, a group related to the Utah WebSDR will find themselves in Texas during the event, not only for the "eclipse experience" but also to set up a temporary transmitter that will operate simultaneously on 80, 40, 30, 20, 17, 15, 12 and 10 meters that will radiate WSPR and other signals referenced to local atomic frequency standards and GPS timing. Those signals - and other similarly-equipped stations along and outside the eclipse path - will be received at the monitoring site at the Northern Utah WebSDR but at other sites that are also equipped with GPS-referenced receivers.
Remember to look up on April 8 - but be sure to do so safely!

26 March: UPS replaced and lightning strike from "Thundersnow"

New UPS:

On this day our local correspondent was on site, having received the new UPS for the remote receiver site, testing it. This UPS seems to be a bit better-built than its predecessor and we hope that it lasts while.

Flash and boom!

During this testing - with the old UPS offline (of course!) he was more than startled when there was a simultaneous FLASH and BOOM if "Snow lightning" that thundered through the building, knocking out power - but it returned after a few seconds after a "recloser" sequence from the utility. Since there was no UPS connected at that moment, all servers lost power. He commented that he could discern almost no difference in time between the "flash" and "boom" indicating that the strike was certainly within a few hundred feet of where he was sitting.
Upon return of power mains power, things started rebooting and remotely, I did a quick check of all of the receivers and servers and found that everything seemed to be working again with the exception of the LF (0-400 kHz) signal path which was chock full of noise from what appeared to be 30 kHz and harmonics from a switching supply. A bit of sleuthing indicated that this seemed to be originating outside the building indicating that there might be an open/intermittent coax shield somewhere along the signal path.
Just a few minutes after strike, the snow squall had stopped as quickly as it had started and it was sunny, so he ventured out - his heart still racing from the adrenalin surge - to see what had happened. About 30 feet (10 meters) south of the building he found a small, freshly-excavated divot in the ground surrounded with still-smoldering grass and greasewood indicating that at least part of the strike had hit there. Stamping out the smoking vegetation he proceeded with a visual inspection of the power line, the antennas and guy wires.
Since (pretty much) everything seemed to be working and there was not obviously anything amiss, he continued the installation of the new UPS - which mainly involved connecting to the external, on-site battery banks. The new UPS is now online and appears to be working.
As a final check before he departed the site I did a remote check of all receivers and noted that the LF branch was again working - although something about it doesn't "seem" to be quite right: The overwhelming 30 kHz switcher energy and harmonics was now gone, but it seemed as though signal levels aren't quite what they should be and may be inconsistent: An inspection of the RF signal path for this antenna will have to wait another day.
I suspect that the time, effort and money we invested in the spring of 2022 to overhaul and upgrade our lightning protection and grounding just paid for itself!

23-24 March, 2024: Power outage

At around 2024 MDT on 23 March (0224Z on 24 March) the remote receive site of the Northern Utah WebSDR went offline - this, after several hours (about 3.75) of being on battery. Prior to this, a very violent storm with high winds and lightning - including "thunder snow" - went through the area.

Our logging shows that the mains voltage dropped from 122 to 108 volts just after 1625 MDT which likely pushed the local utility's voltage regulator to its maximum boost voltage (e.g. the distribution voltage was likely a fair bit lower than 108 volts would indicate) and finally dropped to about 13 volts a bit after 1640 MDT and remained at that voltage until about 0437 MDT when it finally went to zero.
Fortunately, our local correspondent was in a nearby town and was able to get to the building to verify a power failure, he noted that one of the old Dell LCD monitors was powered up indicating a lack of signals: On that phase - which is different from the one used to monitor/log the mains voltage - there was about 20 volts: To be safe, everything not going through the UPS was disconnected.

"Driving the line" back toward town - which was also in the direction of his home - our correspondent noticed at least two locations where the high voltage lines had jumped off/broken insulators and were hanging lower than normal and/or tangled with each other. Visual inspection also revealed possible damage to other insulators, lightning arrestors, burn tracks on poles and cross arms, and several instances where the failure had caused a localized fire of the vegetation around the pole - which had apparently been extinguished by the rain and snow that followed.

The pole numbers near the problems were noted and reported to the local power company - which was apparently overwhelmed with outages related to this weather event was unable to start an investigation on this incident until hours later.
As it turns out, the two parallel runs of transmission lines "flip" positions on the top of a nearby mountain so the worst of the observed damage was not on the line that feeds the WebSDR site.
The more immediate problem was much closer to the WebSDR site. The word from the power company revealed that a pole within the power enclosure of a nearby customer fell onto the Utility's lines and caused a faulting out of the circuit: As of the morning of 24 March, there was a hive of activity to remedy the situation.

A generator was brought out to the site to restore power some hours later, but it's unknown if it'll be able to run things long enough for the utility to effect repairs. While this generator is capable of powering all computer gear on site, we shed the "scientific" loads (e.g. WSPR monitoring, noise and signal analysis, etc.) to maximize run-time. The biggest single load on the generator in this configuration is the "bulk charger" which can put about 20 amps into the battery bank (the UPS itself is capable of about 10% of that!) so that if the generator goes offline there will at least be (e.g. runs out of fuel) some run time on battery.
Expect occasional outages until commercial power is restored.

For reasons currently unknown, the UPS's output will occasionally "chatter" causing the "A/B" transfer switch to do likewise which will sometimes cause one or more of the on-site servers to reboot.

The mains power was restored in the early hours of Monday, 25 March.

20 March, 2024: More site visiting - brief outage, expect more!

On this day we got word that the power company that there would be an outage due to work upstream on the power grid, so our local correspondent went out there with a generator.
While out there, he heard a loud "pop" and all servers rebooted. A quick assay revealed that the on-site UPS had partially failed and was now reeking of "blowed-up" capacitor and a wisp of smoke was emanating from it. This event roughly coincided with a brief power failure (a second or two) so the "B" output of the on-site UPS transfer switch was immediately connected to the generator. A few minutes later, the power went out "officially" and stayed out for the duration of the scheduled outage.
We are now purchasing a "new" UPS to replace the one that just died - this is either the 4th or 5th UPS that we've had on site since the WebSDR went online. This UPS held up pretty well over the past 3 or so years considering the abuse that it has gotten from surges, brown-outs, lightning and whatnot!

We were able to temporarily install a "spare" UPS to tide us over until the new UPS arrives.

15-17 March, 2024: Site visit

Most of the work for this site visit was "behind the scenes" to address some long-standing issues that needed to be addressed, but most people would notice - and some related to future activities and research.

Readjustment of gain for "2M Lo" on WebSDR #3 (Blue).

The gain of this receiver was adjusted downward a bit as this receiver was being (occasionally) overloaded when multiple repeaters/users keyed up. This tendency for overload is "par for the course" when RTL-SDRs are used as they are marginally suitable for this purpose.

We have acquired some additional SDRPlay units and are looking into their use for 2 meter reception using a "new" (untested) configuration: Obviously, we need to test this potential configuration before trying it!

More work on common-mode isolation.

On of the banes of having many pieces of interconnected RF equipment is that having more than one, single wire connected to a receiver means that there's the potential for ground loops and introduced noise - and having "noisy" devices like computers involved makes the problem even worse. Through the use of common-mode chokes and bonding we further-reduced these issues, particularly on lower frequencies (e.g. 630, 2200 meter amateur bands)

Brought eclipse research test machine online.

This computer - one of the "shelf spares" for the WebSDR - was outfitted with an RX-888 (Mk2) receiver modified for external clocking - this being provided by a Leo Bodnar GPS reference. Being GPS-referenced - accurate to a tiny fraction of 1 Hz - should permit analysis of Doppler shift.
The purpose of this machine is to record - in its entirety - all of the HF spectrum - for periods before, during and after the eclipse to analyze the many signals (amateur radio as well as AM broadcast and time stations) that are present to ascertain the effects caused by the changing ionosphere around the time of the event. As it turns out, we were able to achieve only about a 60 MHz A/D clock (and set it to 58 MHz to be cautious) but this should adequately acquire the entirety of the HF spectrum - with a bit of aliasing on 10 meters which (hopefully) won't be much of a problem.
If you have been reading this for a while you'll note a reference to similar work for the October, 2024 eclipse where we tried a similar recording - but this was of only marginal use as we "discovered" issues related to buffering/queuing of large amounts of data. This machine is running a minimal operating system with modifications to maximize its ability to do these recordings while losing as few samples as possible: We believe that we have succeeded in this.
The machine that we used in October - also connected to a GPS-referenced RX-888 - is now used for high-resolution WSPRNet and WSPRDaemon recording and will also be participating in gathering data for the April, 2024 eclipse.

WSPR Frequency/time reference brought back online

For the October, 2023 eclipse we installed a box - also GPS-referenced - that injects low-level RF signals into the receive signal path for the two RX-888 based receivers (but no-where else, so users of the WebSDR won't see these.)
This box is used to provide absolute frequency, time and amplitude referencing to the recordings to allow correlation during analysis after the event.
Previously, it was discovered that the GPSDO (a 10 MHz GPS-referenced oscillator - more stable than a Bodnar) used to provide a reference to this box was creating a lot of switch-mode power supply QRM across the amateur bands. With the use of a linear power supply to power the unit as well as the addition of strong L/C filtering within the GPSDO, this issue was completely quashed.

Operating systems on KiwiSDRs upgraded

The operating systems of all six KiwiSDRs on site was updated to a recent Debian version. This was necessitated - with some urgency - by a known flaw in the older (specific) version of Debian that finally reared its head, causing system instability over the past few months of all but one unit (KiwiSDR #3 or #5) which happened to be running an even older version that didn't have the same issue - but was updated, anyway.

Anemometer on the weather station "fixed"

The anemometer on the weather station on site was reading very low wind speed and this was traced down to the fact that the internal magnet - used to trigger the magnetic switch to count rotations of the cups - was covered with iron dust, some of which had infiltrated the bearings.
The dust and bearings were removed, flushed with solvent and then re-lubricated to restore proper operation. A new anemometer module (which is cheaper than the entire outdoor weather unit) was ordered to have as an on-site spare.
This iron dust - which will accumulate if you simply leave a strong magnet outside almost anywhere on Earth - is likely a combination of magnetite from the alluvial deposits in the surrounding area as well as meteorite dust. Since the site is surrounded by alluvium, it's not surprising that this occurred.

Use for "new" receive hardware

As mentioned earlier, we have newly-donated SDRPlay RSP receivers on hand and are trying to determine their best use. We'll likely use them to improve reception/performance on some of the "bands" that currently use older hardware (e.g. "softrock" receivers) but are trying to figure out the optimal use. We had planned to install one or more of these receivers on this maintenance trip, but we spent more time fighting with the eclipse test machine than we expected!

5 February, 2024: Internet outage

On this day the remote Northern Utah WebSDR site lost Internet connectivity for approximately 90 minutes, beginning a bit before 1625 MST.
This outage was caused by two separate events: Along the fiber corridor in a nearby-ish city, a vehicle plowed into a utility pole, knocking out power in the area and laying the underhung fiber on the ground.

Not too long after this, a truck plowed into the back end of the law enforcement officer's vehicle investigating this accident, causing the loss of another pole and knocking out the power in the fiber corridor and surrounding community, interrupting two separate fiber providers and knocking out the power at our ISP's fiber landing.

While our ISP was able to switch to generator power, the damage caused loss of connectivity from both fiber providers for a while: After a while, a temporary VPN was set up to route a significant portion of the ISP's capacity via yet another route, more or less restoring service.
The ETA for all repairs and normalization of connectivity on the part of the providers and the power company is expected to be on the order of 24 hours or so.

24 December, 2023: DNS issues

On the evening (U.S. time) of this day the WebSDR may have been inaccessible for some time. This was not caused by a network outage on part of the WebSDR but rather the authoritative DNS (the Domain Name Server - the server that converts the name of the web site to the numerical IP address) that was offline.

21 December, 2023: Network connection dropped

It would seem that the first wireless hop (located atop a nearby mountain) between the remote WebSDR site and the Internet went offline at about 0741 this morning. Connectivity was restored approximately two hours later.
The cause was determined to be the tripping of a current overload protection device on the DC bus at the site of the first wireless hop from the WebSDR site toward the Internet: Adjustments have been made to the gear to improve the operating margin while simultaneously maintaining an appropriate degree of safety/protection.

15 December, 2023: WebSDR outage

On this day several things occurred:

There was a network outage caused by a link radio dropping off unexpectedly. A power-cycle was required to restore it.
While we were at it, we did some software upgrades to the servers - something that had been on our "to do" list for weeks, but never got around to it: We typically try to do such things very late at night to inconvenience as few people as possible, but since we were there...
Work was being done at the nearby pipeline and that work was causing severe disturbance of the power line voltage - ranging from no voltage at all to a peak of over 190 volts AC on a 120 volt circuit, causing the instant failure of several of the still-remaining incandescent lights - so we turned off the main power to the building (running on battery) for most of an hour until they stopped messing with it. The guy from the power company was not pleased with what he witnessed the other folks doing!

8 December, 2023: Grid power restored - for now

On this day - at approximately 10 AM - the power company reconnected to the grid, getting us off the portable generator that they had brought in a few days ago. This "transfer of power" was - unlike some in recent times - completely without incident in that nothing blew up, voltages were as expected, etc.
The unofficial word received from the power company is that due to incoming winter weather, they have suspended work on the line, having done as much as they could - but not as much as planned: It is our understanding that in the future, additional work will be done on repairing/upgrading the power lines - likely closer to the spring when the weather is more clement.
The good news is that the lines feeding us and the commercial customer have been very thoroughly inspected and the worst of the problems have been addressed. The bad news is that there is still a lot that needs to be done to bring it up to par, but at least they know now what most of these issues are and likely have some plan of amelioration.

4 December, 2023: Grid (power) failure - Part 2

At about 10 PM the grid power was "restored" - sort of. Nearby, there is a pumping station for a pipeline and power company brought in a large generator for that customer - but since our power feed is simply a "tap" off the large, industrial feed, we are being fed by this generator as well.
For the time being, we are available to resume "normal" operation while the repairs are underway.
The word from the power company is that it will be a few days before the "real" grid power is restored.

4 December, 2023: Grid (power) failure - Part 1

At 0951 AM MST the power failed at the remote WebSDR site. This failure was caused by mechanical failure of multiple power poles - in other words, they fell over! This failure occurred about a mile (1.6km) away from the WebSDR site.

This failure would appear to be a cascade failure with one power pole failing, and then breaking adjacent poles by over tensioning the catenary of the high-tension power line. These poles are quite tall, carrying a high-current, high voltage industrial line (either 27kV or 38 kV). These poles traverse a wetland and it is likely that they are about 50 years old.

It is suspected that the first power pole failed several days ago (Saturday, 2 December), but being rural it apparently went unnoticed until more poles had broken and one of the phases finally faulted - possibly by getting too close to the ground.

With the power failure this morning, a fairly large work party from the power utility appeared. While we have had little communications from the power company (we are not the major customer, and we are staying out of their way) what we do know is that much more hardware is being replaced than just the original pole failures and this is likely to take several days.

For this reason we expect that grid power at the WebSDR site will be erratic - if present at all - until this work is completed.

Users of the Northern Utah WebSDR should expect the possibility of occasional loss of service over the next few days.

While the Northern Utah WebSDR has battery back-up, it can only last about four hours. We have a generator on site, but its limited fuel capacity only allows it to run for between 6 and 10 hours, depending on load: Since - once we are on generator - we must run the site and recharge the UPS battery (we have a high-current "bulk" charger to speed this process) predicting the run-time is difficult.

Because the receive site IS remote, keeping the generator fueled is awkward - and doing so around the clock, even more so!
While we will do what we can to keep the WebSDR online during while the power utility does its repairs, please understand that this is a fairly remote site, some distance away from where those who maintain it live and it may not be possible to keep it running at all times until the mains power is restored to reliability.
During this time, we will shut down some of the services - namely the CW Skimmer and some or all of the WSPRNET reporting - to reduce power load and increase battery run-time.

20 November, 2023: Localized network outage.

On this morning, at around 0530MST, an outage occurred at the first "hop" away from the WebSDR site toward the Internet - one of three wireless hops required to get from the rural location of our receiver site to the nearest fiber landing. Due to the "awkwardness" of reaching this site - and the time at which the problem occurred - it took a couple of hours to reach the side and effect a temporary work-around to get it back online. Inconveniently, this event roughly coincided with inclement weather and the first valley-level snow fall of the season.

4 November, 2023: Wide-area network outage.

On this morning, starting a bit before 0740MDT, much of the Internet feeding (all of) Northern Utah collapsed in a sort of cascade - but this seems to have started quite some time ago. About six months ago, the local power utility scheduled an outage for maintenance and upgrades along the main highway corridor: This outage would specifically affect infrastructure located very near the highway - and it happens that at least here in Utah, much of the telcom infrastructure is also located along these transportation arteries: This makes sense as obtaining right-of-way for such things is simplified as this would be granted in large part by one government entity.
While one of the major providers (e.g. "Utopia") seemed to be aware of this scheduled outage, the word didn't seem to get passed along very well to related customers.
This morning, the power company switched off the power as scheduled at around 0400 and turned back on around 1100 - but it would seem that the provider did not quite put it together to realize that their designed battery run-time was only about 2 hours, so by the time the Utah SDR lost connectivity at about 0740, four or five sites along the fiber line had depleted their back-up power reserves. It is currently estimated that at least 15,000 individual customers lost connectivity along with data connectivity through at least one major cell phone carrier which also meant that businesses who had "backup" connectivity actually did not. Utopia reports that 200-300 "customers" were affected, but this count appears to include ISPs, businesses and, possibly, even a cell carrier - many of these having their own customers, so this number likely does not reflect the number of persons that were "inconvenienced".
At this point one might ask, "Don't you have back-up connectivity?" For the WebSDR - which is user-supported through donations, the quick answer is no: We could not reasonably justify spending significant amounts of donor's money on something that is free to use for an event that would seem to be unlikely to happen. If you think that we should consider such, remember that while the WebSDR isn't quite in the middle of nowhere, we can see it from the tops of our towers: It's not like it would be easy, cheap or convenient to add a totally-isolated back-up. Incidentally, if we had installed a backup to the nearest populated area, it, too, would have been taken down by this outage!
On schedule, the power company restored service at 1100 MDT and over the next 5-15 minutes, the networking equipment along the line came back up and service was gradually restored, apparently back up by about 1115.
So now you know!

28 October, 2023: Experimental WSPR receiver system undergoing testing.

On this day an experimental receive system was brought online using a GPS-referenced RX-888 (Mk2) wideband SDR. This receiver, connected to an Intel i7, eight core computer running Linux, is operating at a sample rate of 64.8 Msps meaning that it can inhale the entirety of the VLF, LF, MF and MF spectrum simultaneously. This same receiver/hardware/software combination can also support a sample rate of 130 MHz meaning that it is theoretically capable of receiving signals on the 8 and 6 meter bands as well.
Running on this computer is software called "KA9Q Radio" which is capable of producing hundreds of simultaneous, virtual receivers of arbitrary bandwidth and mode. In this case, the main interests are receivers looking at not only all of the WSPR subbands from 2200 through 10 meters, but also time and frequency standard signals such as WWV, WWVH, WWVB and CHU.
Also running on this computer is the WSPRDaemon software which uses WSJT-X binaries to decode WSPR and the various modes of FST4W and report this to not only wsprnet.org, but the more expansive WSPRDaemon database which collects more data - including measurements of background noise levels - than a standard WSPR reception. Additionally, the monitoring of the time and frequency standard signals - and possibly select broadcast transmitters - allows the possibility of monitoring these signals as well, both in terms of signal strength but in frequency.
These signals are being reported under the callsign of "KA7OEI/Q" (for "KA9Q Radio"). This receiver is currently using only the TCI-530 omnidirectional antenna (and an active E-field whip for 2200 meters). This receiver is operating separately from the pre-existing "KA7OEI-1" receiver system which aggregates data from not only the omnidirectional antennas, but also the two directional antennas - the East-pointing and Northwest-pointing log-periodic arrays.

Note: Because KA7OEI-1 uses all three antennas - and the reports only the strongest of the signals - one cannot directly compare the results reported to the wsprnet.org web site: The WSPRDaemon database must be used to directly compare the reports from just the KiwiSDRs using the same antenna as the RX-888.

The main purpose of this is to test the performance of the RX-888 (Mk2) to verify that it is a viable alternative to other "full-spectrum" receivers like the KiwiSDR and the Red Pitaya - and to aid in the development of the software used to support the RX-888 and similar receiver hardware.
This same hardware will also be used to test receiver configurations that may be used for WebSDRs in the future - a natural fit for KA9Q-Radio. (Watch this space!)

25 October, 2023: Salt Lake "Metro" WebSDR - 2 meter Earth<>Space hardware upgraded:

On 24 October, 2023 - with access to a lift - we were able to (finally) install an M² 2 meter "Egg Beater" antenna at the site of the "Salt Lake Metro" WebSDR.
Additionally, we replaced the RTL-SDR Dongle with an SDRPlay RSP1a which offers vastly superior performance in many ways: Not only does it have a 14 bit A/D converter (as opposed to the 8 bits of the RTL-SDR dongle) but it has far better sensitivity and (especially) very much better filtering.

A 200 kHz wide band-pass filter was configured for the RSP1a which perfectly fits the 145.800-146.000 2-meter Earth<>Space segment. This also does an excellent job of removing energy from 2 meter repeater inputs that could desense the receiver.
Note that because the only two coverage bandwidths available on the WebSDR that might be suitable for covering this 200 kHz sub-band are 192 and 384 kHz, we chose 384 kHz as it includes all of the desired spectrum, but because the coverage is a bit wider than the filtering, the edges of the waterfall above 146.00 and below 145.80 MHz are darkened.
The S-meter on this receiver has been calibrated to be within +/- 1dB at the antenna terminal. CW signals down to about -127 dBm are copiable in narrow bandwidths.

Remember: If you with to predict when a satellite is passing overhead, if you wish to listen for it via the WebSDR, be sure to calculate the times for Salt Lake City (where the receiver is located) rather than your location!
Here is a link to the "Metro SLC" WebSDR that will place the receiver at 145.900 USB: http://slc2meters.sdrutah.org:8901/?tune=145900usb

24 September, 2023: Changes made:

60 Meter receiver on WebSDR #1 (Yellow) upgraded.

Up to now, the only coverage of 60 meters on the Northern Utah WebSDR was via the "60-49M" receiver using an inexpensive RTL-SDR. This device, having 8 bits, is what we consider to be a "low performance" receiver as that hardware isn't really up to handling the wide variations of HF signals between weak and strong with aplomb meaning that - particularly when the band was quiet during the day time, images/distortion - particularly from WWV - would appear across it due to the low signal level and too-few A/D converter bits being "tickled" with the signal.
On this date the 60 meter receiver was replaced with an SDRPlay RSP1a. The coverage of this receiver was reduced from about 2 MHz to 700-ish kHz so that it covers from about 4850-5500 kHz - but it does so with better performance, sensitivity and resistance to distortion of the previous. This coverage was selected to include WWV/H and most of the 60 meter Shortwave broadcast band because, why not?
The original "60-49M" receiver hardware was moved to WebSDR #3 as described below.

"60-49M" receiver moved to WebSDR #3 (Blue)

With the upgrade of the 60 meter reception on WebSDR #1 (Yellow) the original receive hardware was freed up and since we'd had only seven of the eight available slots filled on WebSDR #3, we placed it there.
The "60-49M" receiver - now on WebSDR #3 - is exactly the same as when it was on WebSDR #1, so you can still listen to your favorite 60 and 49 meter shortwave stations there, if you like.

2200 and 630 meter receivers back online

The 2200 and 630 meter receivers are, again, working properly.

The audio cable for the 2200 meter receiver wasn't making good connection: One of the two channels (I or Q) was missing, causing the levels to be 6 dB low with images.
On the sound card for the 630 meter receiver, the external power cable's connector had been slightly bent during install and wasn't making good connection, causing the analog input section of the card to be un-powered, resulting in an odd combination of high noise level with no sensible signals. The pins were bent back to their proper shape and the connector re-seated, restoring operation.

Eclipse monitoring gear installed.

As noted in the19 September, 2023 entry, additional equipment was installed on site to aid in the monitoring of transmissions made during the upcoming eclipse(s):

A custom-made reference unit was installed in the signal path to the RX-888 and the KiwiSDRs on the TCI-530 Omni antenna. At 250 and 750 Hz above the center of each of the WSPR bands (on 80, 40, 30, 20, 17, 15, 12 and 10 meters) there are two carriers:

The "R1" carrier is placed precisely 250 Hz above the center of the WSPR band and it is BPSK-modulated with the phase flipping 180 degrees approximately 82.2 microseconds after the beginning of each GPS second. This signal may be used to orient the recordings to the beginning of the GPS second as well as provide the possibility of external signal from remote transmitters being similarly-modulated being measured to determine the approximate time-of-flight between it and the receive site.
The "R2" carrier is placed 500 Hz above this (750 Hz above the center of the WSPR band) and it is unmodulated. This signal is primarily a frequency reference to allow direct comparison of similar signals originating from the field to allow direct, continuous measurement of Doppler Shift. Like the "R1" signal, this signal can also be used as an absolute amplitude reference to determine the strength of the incoming signals.

On a separate, non-public server, a GPS-locked RX-888 (Mk2) receiver has been installed to allow recording and monitoring of the signals before, during and after the Eclipse event on all HF band. This can include both the WSPR/FST4W signals and others such as WWV/H, CHU and AM broadcast stations.

If you have any questions about the above gear, please feel free to make contact using the information found on the bottom of the "About this WebSDR and Contact Info" page.

19 September, 2023: Occasional outages scheduled for the weekend of September 23/24 Mountain time.

During the upcoming weekend we'll be performing maintenance and upgrades that may affect all servers. Specifically, we are planning to do at least the following:

Repair/reconfigure the 2200 and 630 meter receivers. These two receivers have been (effectively) offline since late July: We believe that lightning damaged the 630 meter receiver and there is a signal path issue with the 2200 meter receiver: It appears that either the I or Q channel is missing, causing the spectrum to be "mirrored". At the very least, we will repair the existing receivers, but we are considering the installation of another RSP1a on WebSDR #1 that will cover both the 2200 and 630 meter bands, simultaneously.
Reconfigure the 60 meter receiver. We are also considering moving the main 60 meter receiver on WebSDR #1 from an RTL-SDR to an RSP1a. This reconfigured receiver will cover much less spectrum - either 384 or 768 kHz - but it will offer superior performance to the existing receiver. It is likely that we will then move the existing 60 meter hardware to WebSDR #3 to retain full 60-49 meter SWBC coverage.
Work on the CW Skimmer. Up to now, the CW skimmer has been configured only remotely: Its operation and performance has not yet been properly characterized, and due to software limitation (e.g. getting audio channels of greater than 48 kHz sample rate from the Linux source into Windows) only relatively small parts of the CW portions of several bands is not currently being covered. We are hoping to increase the coverage on some of these bands from 48 kHz to 96 or even 192 kHz - plus add a few more bands, such as 2200, 630, 160 and maybe even 60 meters.

The main reason for the site visit will be to install another receiver system on site - the main purpose of which is to facilitate the monitoring of signals during the upcoming solar eclipses.

This receiver will be a modified RX-888 (Mk2) that is capable of monitoring the entire HF spectrum at once and, specifically, it will be used to precisely measure amplitude, frequency and possibly absolute time-of-flight of signals originating from transmitters along the eclipse path and elsewhere.
This receiver/system will be GPS-referenced so that the data captured can be analyzed to divine the aforementioned signal properties with scientific precision.
This system - since it has no real user interface - will not be publicly accessible in the same manner as a WebSDR, but its results will be made available for ongoing research in propagation - both eclipse-related and for propagation in general.
This new hardware will also be be evaluated: Specifically, seeing if the RX-888 (Mk2) and similar devices may be used as alternate receive hardware for the propagation research that has been ongoing at the Northern Utah WebSDR for several years now and also for future upgrades of the WebSDR system itself.

10 September, 2023: CW Skimmer online.

As previously noted, some of the recent configuration changes and upgrades would allow the inclusion of a CW skimmer system. This system "listens" to chunks of spectrum and automatically decodes all Morse transmissions that it can hear, reporting the callsigns of those calling CW - and transmission of beacons to the Reverse Beacon Network (RBN) - LINK.
Installation of the software was done around August 11 and testing was begun - first on just a few bands, but then rolling out reception on other HF bands a few days later. At present the following bands are covered:

80 meters - Center: 3530 kHz +/- 22 kHz
40 meters - Center: 7030 kHz +/- 22 kHz
30 meters - Center: 10120 kHz +/-22 kHz
20 meters - Center: 14030 kHz +/- 22 kHz
17 meters - Center: 18088 kHz +/- 22 kHz
15 meters - Center: 21030 kHz +/- 22 kHz
12 meters - Center: 24910 kHz +/- 22 kHz
10 meters - Center: 28030 kHz +/- 22 kHz

The antenna being used for RBN coverage is the TCI-530 Omnidirectional antenna: The other antennas (e.g. the 2 beams) are not being used for RBN reception at this time.
At present, only about 44 kHz of each band is covered, the reason being is that we haven't figured out how to get more than a 48 kHz "pipe" from the Linux WebSDR servers into the Windows sound system (RBN runs on Windows!) so if you know of a means to get more than 48 kHz of TCP-based audio into a Windows machine, let us know!
The callsign being used for the reporting is "KA7OEI". The Northern Utah WebSDR doesn't currently have its own (club) call - and it seems as though the Reverse Beacon Network doesn't allow non-callsign identifiers for its receive stations.
During this initial period, several issues were discovered - and resolved, one relating to aliased/image signals were getting their way into the decoder's signal stream. For an example, a strong signal 3 kHz above the +/-24 kHz passband would appear much more weakly 3 kHz above the bottom of the passband, but reconfiguring the signal translation (specifically, tightening the transition bandwidth of the decimation) seems to have reduced these already-weak responses even more - hopefully to the point of nondetection.
At some point we'll likely add more bands (2200, 630, 60, etc.) and - if we can figure out how to get larger than a 48 kHz pipe into the Windows machine, more bandwidth on the currently-covered amateur bands. We are looking into the use of additional receivers on the other antennas on site as well.

13 August, 2023: Server reconfiguration complete, comments:

The reconfiguration described in the 12 August 2023 entry was completed without incident.

It was observed that occasionally, some of the softrock receiver loopbacks will stop - but not all of them. This is being investigated.

630 meter receiver offline.

It was noticed that the 630 meter receiver appears to be non-functional, producing a rather high noise floor. It is suspected that the receiver preamplifier was zapped in a recent storm and next time someone visits the site it will be investigated - and even more lighting protection will be added as appropriate.
While it is working, it appears that the 2200 meter is not working properly: Its sensitivity is down a bit and there are signal images indicating that it's likely that one of the two audio channels (I or Q) is missing.
Since neither 2200 or 630 meters are "summer" bands (more lightning static than on 160 meters!) their operational status is not critical at this time of year, but it will be addressed during the next site visit. Because the KiwiSDRs are working fine on both 2200 and 630 meters, they may be used, instead - and this also indicates that their respective receive antennas are working properly.

12 August, 2023: Server reconfiguration

In order to make everything consistent WebSDR servers 1, 2 and 4 will need to be interrupted for a while to reconfigure the signal paths within as follows:

WebSDR #1: Make the band numbers line up with the signal loopback numbering and send the signals for the bands currently using Softrock-type radios (2200 and 630 meters) through the loopback system.

WebSDR #2: Make the band numbers line up with the signal loopback numbering and send the signals for the bands currently using Softrock-type radios (30, 17 and 12 meters) through the loopback system.

WebSDR #4: Send the signals for the bands currently using softrock-type receivers (30 and 17 meters) through the loopback system.

These processes were done and tested on WebSDR #5 very early this morning - but this was not without problems: The loopback would quick after a while (the "aplay" utility would time out) but this is (hopefully!) resolved.
For some reason we didn't realign the band numbers with the loopback configuration on WebSDRs #1 and #2 when we replaced the servers (it was late - we were tired!) but we are doing it now.
By aligning the receiver numbers with the band numbers we are making things less confusing for ourselves in the future - and by putting the remaining softrock-type receivers through loopbacks allows us to send their signals to other processes - and other computers - for things like CW skimmers and other signal analysis.
These interruptions will occur between 2300 and 0000 MDT this evening (0500 and 0600 UTC on 13 August) and should take much less than the full hour to accomplish.

11 August, 2023: CW Skimmer and PSK reporter testing

Making good on previous threats, we are pleased to announce the testing phase of two pieces of software:
CW Skimmer

A "CW Skimmer" monitors a chunk of spectrum and decodes - as best it can - the CW transmissions occurring within it. Callsigns, CQ calls, beacons and other information is then posted to the Reverse Beacon Network (link) where one can view some of this information - namely who is calling CQ and who is hearing it.
The present configuration is very kludgy in that the conveyance of the audio from the Linux WebSDR servers to the Windows machine running the CW skimmer (it runs only on Windows, so we have to deal with it!) is very manually configured. Additionally, the best bandwidth we can attain is that which will cover just under 48 kHz of spectrum: Once we determine the best (less "hacky") way forward, the start-up process will be automatic (or only a few mouse clicks) and we hope to cover 96 (or even 192 kHz) of bands as appropriate.
As of the time of this writing the CW skimmer is operating on 80, 40 and 20 meters (via the omni antenna) - all three receiver centered 30 kHz above the bottom of the respective bands. The reporting callsign is currently "KA7OEI" - although this is subject to change.

PSK Reporter - FT-8 spots

We are also occasionally testing the monitoring the 40 and 20 meter FT-8 frequencies (via the omni antenna) and the reception reports are being forwarded to the "PSK Reported" web page (link). The reporting callsign is "NUTSDR" if and when it is active.

This is a test!

As noted previously, this is all in a testing phase and you should expect the above to occasionally go offline or - hopefully - become more stable with more bands added. Currently we have the ability to monitor the following bands:

2200 Meters, 630 meters, 160 meters, 80 meters and 40 meters (omni and east-pointing beam).
On the omni, east-pointing beam and northwest-pointing beam: 30 meters, 20 meters, 17 meters, 15 meters, 12 meters and 10 meters.
Owing to hardware limitations, we cannot currently monitor 60, 6 or 2 meters - but this could be addressed in the future if there is call to do so.
There are limitations related to how many "receivers" can operate simultaneously so we likely cannot monitor all of the aforementioned band/antenna combinations so we'll have to pick and choose - when we get to that point.

There also exists the possibility of adding monitoring of RTTY, PSK31 and FT-4 transmissions - plus whatever might appear in the future.

This would not be possible without your donations and support!

The addition of the above was made possible after the upgrade of the WebSDR server hardware - and the purchase and implementation of a stand-alone Windows machine to run the CW Skimmer software.
If you have questions about this, feel free to contact using the information on the "About" page link at the bottom of this page.

28-30 July, 2023: Server replacement - and a few receiver upgrades:

We would like to thank all those who donate to help support the Northern Utah WebSDR! Without your support we would not be able to make upgrades and improvements over time.
2 meter reception improved. As we have a building full of computers, it's no surprise that there is some computer RFI. While this is undetectable on HF, there have been issues with weak birdies across 2 meters. This issue was largely eliminated when we moved the 2 meter antenna quite some distance away onto the tower, but there's a bit of inevitable ingress into the cabling and hardware. To mitigate this further, the band-pass filter/amplifier module was relocated from inside the building to the enclosure at the base of the tower, allowing signals to be amplified closer to the antenna before ingress of the interference thus almost completely overriding it in the process.
Server replacement. During this long weekend we did a marathon session to replace ALL of the WebSDR server computers.

The previous hardware - which was current way back in 2008 - consisted mostly of quad-core (Intel Q9650) 2.9 GHz machines and were originally retired media servers. The computer for WebSDR #1, in particular, is exactly the same one that was first made public during initial testing of the WebSDR in January, 2018 - and it has been on almost 24/7 ever since without a single failure - but it was time to replace them with something newer with much more processing capability but did not consume as much electrical power.

It is also expected that with the greater processing power, the ongoing tendency for some receivers to occasionally go into a "stutter" mode will be dramatically reduced.

The new servers have Intel i7-8700 processor with six hardware cores along with much faster RAM and I/O. This hardware will very easily handle the current needs of the receiver hardware and processing and will take us into the future with the ability to do more including support additional services like CW Skimmer, additional signal and propagation analysis and much more.

While our original intent was to simply "move" the operating system images over to the new hardware, onto brand new storage devices, the virtualized file system of newer Linux (Ubuntu, specifically) made this into quite a challenge. In particular:

As expected, UEFI and Grub prevent one from simply moving a storage device from one piece of hardware to another - but it also prevents one from simply making an image and doing so. We spent several hours trying several methods of doing the latter before figuring out the procedure. For WebSDR's 1 and 2, this was a bit simpler as the original SSDs on which the system was installed were smaller than the new NVME drives.
For WebSDRs 3, 4 and 5 these were running on 1 TB spinning drives from the original hardware and although the partitions on these drives was still smaller than the new NVME drives there is (the WebSDRs don't need much in terms of storage space) no real procedure or software tool exists for doing this owing to the complications of the newer file systems. For WebSDRs 4 and 5 we ended up using a image of WebSDR #2 an copying the files relevant to the WebSDR from the old and dropping them onto the new hardware which was much faster than a complete reinstall of everything. For WebSDR #3 we were able to find a procedure as it was still running a slightly older - but still supported - version of Ubuntu and was not running the file system of the others.

Because the focus of this work was primarily on computer/server replacement we did not have time to do much else so there was relatively little done in terms of upgrading receive capabilities and adding new frequency coverage, etc. which means that for the most part the WebSDR will look exactly like before after the upgrade.

The only real change that was made was that all WARC band receivers (e.g. 30, 17 and 12) now have 192 kHz coverage.

Here's a description of what was done:

WebSDR #1: The computer was replaced and the sound card for the 630 meter receiver was swapped for a newer unit to accommodate the bus capabilities of the newer unit.
WebSDR #2: The computer was replaced: Not a lot else needed to be done.
WebSDR #3: The computer was replaced. The existing complement of receivers was retained.
WebSDR #4: The 12 meter FiFiSDR receiver was moved to 30 meters, coverage set at 192 kHz of bandwidth and an RSP1a was implemented for 12 meters, improving coverage and overall performance.
WebSDR #5: Just like WebSDR #4, the 12 meter FiFiSDR receiver was moved to 30 meters, coverage set at 192 kHz of bandwidth and an RSP1a was implemented for 12 meters, improving coverage and overall performance.

Once we have made sure that everything continues to work as expected - and as we get time to do so - we will start to add additional capabilities and consider further receiver upgrades.

25 July, 2023: Comments:

"Mobile" versions of the WebSDR interface updated.

If you have brought up the WebSDR on your phone you might have noticed that it suggests the use of the "Mobile" version of the web page. This lighter-weight and "simpler" version of the WebSDR interface hales from about a decade ago when "smart phones" were less smart, less powerful, and had smaller/lower resolution screens - which is also why it has few bells and whistles (e.g. no noise reduction, fewer modes, etc.).
These days - with "better" phones - there is less call for the use of these page, but some people seem to prefer it on their mobile devices but since it is less-used, it also doesn't get the "love" of the main pages.
On this day, we finally got around to making a few tweaks to the Mobile WebSDR pages:

"Mozilla Audio Start" button added. This is in addition to similar buttons that the user MUST press when using Apple or Chrome.
More sensible frequency and mode on startup. Before, the start-up mode was always "AM" on the "first" band - but now it generally reflects a band and mode that one is likely to use.

Strongly worded email received.

Following the weather-related outage yesterday an email was sent to the ISP - but not to the public address of the Northern Utah WebSDR - expressing apparent outrage at the outage that occurred.

The remoteness of this location - and the fact that it is supported by donations and run by volunteers - means that it's a challenge to get connectivity at all, let alone redundancy: We believe that the majority of our user base is intelligent and fully understands that occasional outages - particularly those caused by Mother Nature - are inevitable, but there are apparently some that fall outside this group.

This email contained a lot of words - but little actual substance and few real details about the nature of the complaint. If taken at face value, it would seem that we disrupted testing of a "new marine high frequency 'Emergency Location Transponder'" based on HF, and that the Northern Utah WebSDR was a "key site" in this testing and network.

If this is the case, it is news to us and in contravention of our stated usage policies - and such use would demonstrate the lack of responsibility and questionable ethics on the part of those who would do so - particularly if they represent information contrary to our stated policies.

It was interesting to note that this email was sent anonymously via Proton Mail - with no contact information whatsoever - and ostensibly from an international organization whose name gets in zero results from a Google search, an unlikely combination of factors in a legitimate email. As such, it will be given the consideration that it deserves. If you wish to read a redacted version of this letter you can do so here.

Apparently, not everyone is aware that the Northern Utah WebSDR is free-to-use and volunteer supported and as such, we offer our service on a "best effort" basis. As noted under the Terms and Conditions of use (link) neither this or ANY WebSDR should be the primary or sole resource for life and safety concerns. While our ISP does have redundancies built into its network, the Northern Utah WebSDR relies on a somewhat tenuous "spur" of this network for connectivity: Geography essentially precludes the implementation of redundant paths that would be cost effective - particularly for our usage model, hence the warnings and admonitions within the Terms and Conditions.
We do not condone, support, or are involved in any commercial uses of the facilities of the Northern Utah WebSDR. If you see anyone, anywhere claiming otherwise, please let us know via the email address on the About page.

24 July, 2023: Severe weather - Direct lightning strike to ISP facility nearby.

Around 1900 MDT a severe lightning storm knocked down one of the connectivity points of the ISP used by the Northern Utah WebSDR located in the town of Corinne, severing connectivity of the remote WebSDR site in Northern Utah from the Internet.

Connectivity to the "SLC Metro" WebSDR server was unaffected as it is not at the same location.

Connectivity restored:

Despite much of Corinne's power being out, connectivity was restored at the ISP facility at around 2015 MDT.
There was an apparent direct lightning strike which has damaged the electrical wiring at the commercial building that hosts this gear and a number of lightning arrestors on the various cables connecting the radio gear topside have sacrificed themselves to protect more expensive gear. There is also some damage to the battery back-up system on site as well as the destruction of a transfer switch on the AC mains.
The site is back up on battery/generator as of the time of writing this (2030 MDT) as a result of a bit of kludging to work around damaged/destroyed components.

Expect ongoing connectivity issues as extreme weather passes through the area, causing disruption of wireless links and while repair/replacement of the ISP's gear is underway.

23 July, 2023: Server hardware upgrade planned

Starting on the evening of Friday, 28 July, 2023 MDT (29 July UTC) we will begin replacing the SDR Server Hardware.

These interruptions will continue through Saturday, 29 July as we work our way through the other servers.

We will try to do this work sequentially, taking down only ONE WebSDR server at a time (we hope!) allowing users to find alternates for reception. For example:

The back-up for 80 and 40 meter reception on WebSDR #1 (Yellow) is WebSDR #3 (Blue).

WebSDR #4 (Magenta) also has 40 meter reception using an east-pointing beam.

The back-ups for 30-10 meter reception on WebSDR #2 (Green) are WebSDR #4 (Magenta) with its east-pointing beam and WebSDR #5 (Teal) with its northwest-pointing beam.

These updates will replace all WebSDR servers - some of which has faithfully served us since the system was first tested in January 2018 - and these servers were already about a decade old at that time! The new servers will have several times the processing power using much newer hardware yet use the same or less amount of electrical power.
With the change in server hardware, we will have to get creative with some of the receivers as a few of the smaller bands are still covered using PCI sound cards + Softrock receivers and with the newer servers having one-fewer slots (only PCIe - no PCI at all) so we'll need to figure out a work-around. We have several ideas in mind that should work - but we'll see.
This new hardware should reduce the likelihood of the drop-out/stuttering issue that we have been fighting for some time (see comments about this in previous entries, below) and it will allow us to use new RX hardware in the future when the time comes to upgrade. Excitingly, it will also allow us to proceed with adding multi-band reception for an on-site CW Skimmer to contribute to the Reverse Beacon Network as well as other related things.
The "Salt Lake Metro" WebSDR providing VHF/UHF coverage in the Salt Lake valley will NOT be affected by this work.

17 June, 2023: "Well, that didn't work!"

The software update that occurred last night was rolled back almost exactly 24 hours later (again, interrupting WebSDR #2 and 4). The reason was that one of the problems noted with a previous version - the "callback" function suddenly stopping - still occurred, causing outages throughout the day. We'll continued to work with SDRPlay for a solution.

16 June, 2023: Software updates

Between 2200 and 2300 MT (0400-0500 UTC 17 June) both WebSDR #2 and #4 were taken down for a few minutes to perform a software upgrade. These servers use SDRPlay RSP1a hardware for 40, 20, 15 and 10 meter (low) coverage.
As you may have noticed, there is occasional "glitching" in the signals caused by the "callback" function (that which gets signal data from the hardware) getting out of synchronization with itself: This is manifest by occasional "clicking" and what may sound a bit like "stuttering" at time. When this happened, it would usually correct itself within a few minutes.
Working with SDRPlay, they sent a new version of the API - code used to interface with the hardware - that they would like us to try out to see if this resolves the problem, and that was installed this evening. We thank the SDRPlay folks for working with us.
We'll continue to monitor the statistics and performance of these receives (and report back our observations to SDRPlay) and if everything looks OK after a few days, we'll roll it out to WebSDR #1 and #5, which also use this same hardware.

24 May, 2023: Connectivity issues:

On this day at 1700 UTC connectivity to the WebSDR site was lost as emergency repairs/reconfiguration had to be done on one of the interconnecting sites: This site is one of several between the WebSDR site and the fiber connection to the gigabit backhaul. Connectivity was restored a bit before 1915 UTC.
Expect occasional interruptions and/or data drop-outs as additional troubleshooting, testing and/or configuration is being done.

19 April, 2023: Power utility work:

On this day the power utility rebuilt the high-voltage (47kv) and the medium (2400 volt) voltage power busses at the nearby substation, feeding the WebSDR.
The reason for this has to do with the power infrastructure being quite old (perhaps in the 50s?) being insufficient for the current power loads at a pipeline pumping station near the substation. Long-term operation of the infrastructure at or exceeding its ratings resulted in the fault that occurred on 11 April (noted below) and subsequent damage to the pipeline equipment.
The mains power was off for several hours, the WebSDR being run on battery - then generator - during this work. From what we can tell, we had no outages at the WebSDR or other equipment during this event.

11 April, 2023: Power disturbances:

A bit after 1200 (noon) local time there were a series of rapid brown-outs over a period of about 25 minutes. According to our on-site line monitor, the voltage could be seen to vary wildly between 60 and 127 volts. These disturbances were apparently county-wide, affecting a large number of customers in the geographical area.
Apparently, the on-site UPS didn't quite know what to do about this and its output would "glitch" (e.g. drop) during some of these transfers. During this melee, WebSDRs #1 and #2 rebooted.
It was known that with the recent upgrade to Ubuntu 22 on the servers, there may be issues with automatic updates: We attempted to turn them off, but apparently missed a few and this caused, during the reboot, some "minor" updates to occur, breaking one of the software packages that we use with the WebSDR.
We think that we have now disabled all of the automatic updates that would otherwise occur when the system reboots - but time will tell! (This all sounds a bit like Windows, doesn't it!)
We are considering alternatives to a UPS - perhaps a system that consists of a high-current charger, a battery and an inverter - that will not require any sort of transfer between the line and load.

4 April, 2023: Internet outage:

Problems with one of the backbone carriers caused routes from many customers in Northern Utah to be dropped for a while. The result of this was slowdowns and outages that persisted over the course of an hour or so around 2100-2200 MDT as network operators worked to correct the situation.

12 March, 2023: Adjusting knobs and dials...

With the update of the operating system on the WebSDRs has come a few hiccups: While operation on the test server showed no problems, there is no substitute for the real world to "stress test" things with multiple receivers and a fairly heavy user load. A few of the issues noted:

The same "stuttering" problem. While the new operating system version fixes a known issue with the low-level USB drivers, it would seem that this wasn't a major cause of problems.
The driver/API will suddenly just stop: For reasons under still under investigation, the new API from SDRPlay (V3.11) seems to have a tendency to randomly stop - an issue noticed by anyone trying to listen to 40 meters (on WebSDR #1) or 20 meters (on WebSDR #4) this morning.

For WebSDR #4, the API has been rolled back to the older V3.07 to see if this problem "follows" the API version or not.

A stripped-down version of our RSP driver (sans AGC) has been installed on WebSDR #4 to see if there is any change in its behavior. If there is, we will at least have a starting point to determine if the features removed (mostly the AGC) have anything to do with the instability - and if this seems to be the case, it will be a basis of further investigation.

We we will do:

While we appreciate the inconvenience that these "driver malfunctions" are causing to users, we are working very hard to get to the bottom of this issue to make sure that the system is as stable as possible.
Unfortunately - as we have noted - there is no substitute for "on air" testing: As much as we have tried, testing and simulation on the development WebSDR hasn't forced the problems to occur, so we have to put it on an "online" server where you, the user, can beat it up and stress-test things.
What this means is that there will be periods where things aren't working correctly (stuttering, no signal). We'll do our best to analyze and restart/change things to restore service as soon as possible, but since there are 24 hours in a day - and we can't keep constant vigil on things - it may take a while before things get back to "normal".

We don't think that this is a direct result of the operating system upgrade, but rather that we've changed several things all at once and are selectively rolling them back/changing to try to determine if there is a cause-effect relationship.

11 March, 2023: Operating system updates.

On this day WebSDRs 5, 4, 2 and 1 were updated to the current version of Ubuntu Linux (22.04LTS). This was done to resolve some possible issues with USB drivers that may be at least partly responsible for the occasional "stuttering" that occurs on the RSP1a receivers.
Rather than an actual "update", the original WebSDR configuration files have been saved and a "clean" install of the operating system has been done as the current servers have been updated several times - starting with Ubuntu 16.04 back in 2018 - and there may be a bit of "wreckage" strewn around the disks from these updates.
This process takes between 1 and 2 hours per server - although it took much longer than this for WebSDR #5 (the first to be done) as there were a number of unexpected dependency and configuration issues - many of them related to things being done "differently" on current versions of Ubuntu as compared to how they were done 5 years ago!
Of course, there may be a few teething troubles along the way as this is effectively a new install - but this version of Ubuntu has already been running on other WebSDRs (e.g. test server, KFS) and it is known to be stable - at least one the initial kinks are worked out.
WebSDR #3 may be updated at a later date: Since it does not use any RSP1a receivers, the priority is lower.

14 February, 2023: Site visit, driver updates.

It was possible to make a site visit today and several things were observed:

The UPS was "stuck" in an error mode: It was not available for backup, the cryptic error code having something to do with the AVR (Auto Voltage Regulator) relay (It's an APT UPS and the error code is "F06"). The UPS was power-cycled and then tested several times by unplugging/plugging it into mains power after this and it seemed to work properly - but we're not sure if this means that the UPS is on its way out. We have an extra UPS available should there be "issues."
A "wall wart" used to power another on-site computer (Raspberry Pi) was destroyed.
It appears as though the hardware USB port on WebSDR #2 locked up in some way requiring that the server be completely powered down before anything was recognized on that physical port, ultimately coming back up and working properly.

More work has been done on the drivers for the RSPs to help with reliability - expect minor interruptions on servers 1, 2, 4 and 5 over the next few days while testing continues. (See the 12 February entry for more information.)

13 February, 2023: Wide area power disturbance knocked down UPS at the WebSDR site - possible equipment damage.

At around 0229 MST in the morning of 13 February, 2023 a wide area power disturbance - likely a high voltage surge - appears to have caused widespread (county-wide) damage to electrical devices. At this same time, the UPS at WebSDR site tripped off line, dumping all critical loads and causing a reboot of all WebSDR servers.
All WebSDR servers except #1 started on their own, and #1 was restarted remotely around 0925 or so when it was discovered to be offline.
The 15 meter receiver on WebSDR #2 (Green) is currently non-responsive and that band is unavailable until either a "re-plug" of the USB port is done or (more likely) a hard power-cycle reboot of that server is done - something that can only be done via a site visit.

Please use the 15 meter receivers on WebSDRs #4 (Magenta) and #5 (Teal) in the meantime.

The on-site UPS will need to be tested. Since it clearly went offline at the time of the disturbance, it may have suffered damage. There is a transfer switch on site that, should the UPS's output voltage fail, it will transfer it to a secondary power source which is currently just the mains power on a different phase.

It's possible that the UPS has been damaged in this incident and that there is currently no back-up UPS on site, but this, too, will require a site visit to ascertain.

It is unknown when a site visit will be possible - but we hope that it can be done in the next day or so.
Please note that the investigation and possible repair may cause additional system outages.

12 February, 2023: New receiver (software) drivers installed.

On this day - mostly in the later evening - the driver software was updated on all of the WebSDR servers that use RSP1a receivers.
It was noticed that the 15 meter receiver on WebSDR #4, in particular, would go into the "stutter" mode even with the new driver indicating that the modification in the code didn't necessarily "solve" the ongoing issue. In response to this a number of configuration changes are being tried (e.g. disabling the AGC, changing time constants, etc.) to see if this helps.

It's possible that this particular receiver has some sort of problem ranging from a flaky USB cable to some sort of issue with the USB port or the receiver itself - but it could also be that the modifications done with the driver to coordinate communication with the API aren't sufficient - or even that the API itself may be somewhat "broken". In the case of the latter, we can hope for an update where the issues are fixed.

11 February, 2023: Testing of new receiver (software) drivers underway.

While the SDRPlay RSP1a receivers used for many of the bands appear to work very well, their does is not completely without "hiccups" - literally:

While it didn't seem to happen when we first installed them, more recently they will occasionally go into a sort of "stutter" mode - seemingly at random. Often the problem resolves itself in just a few minutes, but sometimes the receiver drivers need to be manually restarted.

This issue isn't directly related to the hardware - but it may be that, occasionally, a few A/D samples are lost here and there (which is normal for a computer that is shoveling a lot of data around!) and this, by itself, shouldn't cause a problem - but it may be that some piece of software doesn't deal with it gracefully.

In communications with others using this hardware, the consensus is that there are some "peculiarities" with the vendor-supplied API (software interface) that may lead to corruption of the data flow.

As it happens, the custom-written driver that we use to interface with SDRPlay receivers to the operating system (to allow it to work with the WebSDR using a 16 bit signal pathway at up to 768 kHz of bandwidth) does some "talking" with the API to adjust the RF gain (seen as "RF AGC" on the display) - and the method of communications may be related to issues.
There are times when you can't/shouldn't be communicating with the API or else "bad" things might happen - and there are some (minimally or un-documented) aspects with this communications that one must observe to reduce the probability of making the API "mad".
The reason that we suspect this goes back to what was mentioned earlier: We didn't used to have this problem when we first put the RSP1a's into service, but back then - only a bit more than a year ago - the higher bands (20-10 meters) didn't open that often with "strong" openings. What this meant was that there was infrequent AGC action and thus little communications by the driver with the API - but as the solar terrestrial conditions have changed and improved the conditions on the higher bands, the AGC is now very active when a multitude of strong signals appear and disappear from the bands.
This increase in activity has also correlated with a more frequent occurrence of this "stuttering" on the same bands that are improving and changing wildly over the course of the day. By itself the stronger signals shouldn't have any effect on the stability of the receiver or drivers - but the increased interaction via the API may well be one of the causes!
We are currently testing - at first on WebSDR #5, but later on other WebSDRs, if all goes well - an updated version of our custom driver that jumps through extra hoops during its communication in the hopes that we don't upset the API and cause the "stuttering" issue.

Additional changes:

Up to now we have been using an interim program (a custom version of Linux "aplay" modified to operate at higher than 192 kHz) to take the audio from our custom driver and put it into ALSA, the Linux sound system - which is then used by the WebSDR. Our driver has had the capability of doing this directly, without the use of "fplay" (our modified version of "aplay") but it never worked properly. While making the above changes, modifications were done to our custom driver and we believe that this problem is now fixed, allowing us to eliminate one step in the data pipeline between the receiver and the WebSDR server - and this will (hopefully) further improve reliability and stability.
Additional code was written to allow a more "graceful" exit of the API than before - something that could help improve stability and also speed up restarts.
For more information on this configuration, see the "RF Distribution" page link - particularly the links near the bottom.

What you can expect to happen:

The new drivers and configurations are currently being tested - first on WebSDR #5 (as it has the lightest usage and screw-ups will inconvenience few people) and if those go well, they rolled out to the other WebSDRs - probably in the order of #4, #2 and then #1.
When the drivers are updated there will be brief outages: The waterfall will go black and all signals will disappear. Hopefully, this will last only a few 10s of seconds - but if the "old" drivers misbehave, this may last for a couple of minutes.
Because these are "live" drivers outside the WebSDR, we don't expect that we'll need to restart the WebSDR itself - a process that "kicks" everyone off.
A banner will be posted on the WebSDR server - just above the waterfall - prior to and during these upgrades/changes, so you shouldn't be surprised!

8 February, 2023: Maximum number of users on WebSDR #2 (Green) increased.

With the rising sunspot activity the 20 through 10 meter bands are more active and consequently, the number of users on WebSDRs 2, 4 and 5 is increasing. On this day it was observed that some people were getting a "Too Busy" message from WebSDR #2.
When it was installed nearly 5 years ago, the maximum number of users for WebSDR #2 was set to "85" - in deference to the amount of available outbound bandwidth and also to the maximum number of expected users at that time. Since then the Internet connection has been improved.
It would also seem that these days the "higher" bands are getting more and more popular - not an unexpected consequence of the improving conditions on these frequencies and this previously-set limit was no longer adequate, so the limit on WebSDR #2 (Green) was raised to 150 users.

18 January, 2023: Work on WebSDR #1 and WebSDR #3's 80 meter receiver

A site visit was done on this day to investigate two issues that were noticed since the last visit: The loss of the 630 meter receiver's sound card and terrible receiver noise on the 80/75 meter receiver on WebSDR #1
WebSDR #3:

If you'd gone there you would have seen a tremendously-high noise floor - as if a coax cable shield had come undone.
It was, in fact, a loose coax connector: When the AGC thresholds were adjusted on January 13, it must have pulled on the right-angle SMA connector on the 80 meter RTL-SDR and partly unscrewed it: It was "re-screwed" and the problem resolved.

WebSDR #1:

In looking at the local console it was full of errors about no room for a swap file, so the system was rebooted - and it "sort of" came back up, but it was obvious that the hard drive (an SSD, actually) was full. The issue turned out to be the prolific generation of log files by the WebSDR server having filled up the drive: We thought that it automatically deleted these after a while, but obviously not, so a but of file purging later, we now are using only 15% of the 120 GB SSD and it's happy - at least on that point.
As for the 630 meter receiver's sound card - an Asus Xonar D1 - that was re-seated in its PCI slot and that seems to have done the trick.
During this, the computer spontaneously rebooted - not something that we ever like to see! We aren't sure if it was still recovering from the hard drive space (e.g. doing some sort of drive cleanup) or what, exactly, but we are keeping an eye on it. It's possible that the power supply is on its way out or even that it's related to the bad capacitor noted in the 13-14 January entry - but these sorts of things usually cause Kernel panics and the like rather than acting as if someone just pushed the "reset" button. We have spare hardware on site, but transplanting hardware to a new computer is a PITA!

17 January, 2023: 630 meter receiver offline

For reasons unknown, the 630 meter receiver - which uses a sound card - is currently offline and remote attempts to restore it (restart the WebSDR, reboot the server) have not been successful in restoring it.
The next step will be a hard power-down during a next site visit which will occur... sometime soon: Hopefully this will restore service. In the meantime, you may listen via one of the KiwiSDRs on site - See the bottom of the "Landing Page" for more information.

13-14 January, 2023: Site work and comments.

KFS Status:

A site visit was made during the evening of 14 January and the network gear was brought back online, restoring service. Note that Internet connectivity is still a bit "flaky" due to ongoing weather events and pre-existing issues so expect audio drop-outs during times of heavy usage/Internet traffic. Still offline - see the 10 January entry, below, for details.

Site Work (Northern Utah WebSDR):

USB cards were upgraded in WebSDRs 1 and 4, requiring that they be offline for a while.
Issues with #4: In the process, we were able to determine that the source of errors we were seeing on the local console - but not having any obvious effect on the operation of WebSDR #4 - may have been due to a motherboard issue. When we plugged the new USB card into it, it wouldn't "POST" (boot) - but with other testing, we knew that the board was OK. We ended up swapping to one of the on-site spares which involved moving the upgraded CPU from the old to the new, moving plug-in cards and remapping the FiFiSDR receivers used for 17 and 12 meter reception.
Future issue with #1: We installed an upgraded USB interface card in WebSDR #1, but noticed a vented capacitor on the motherboard. This capacitor was away from critical components like a power supply regulator and none of the capacitors appear to be leaking onto the board so we'll either replace the capacitor or swap out to another motherboard on a future visit.
Bug discovered with the router/firewall: When we shut down WebSDR #1 we changed the routing so that people going to #1 would end up on WebSDR #3, the 80/40 meter "backup" WebSDR. It would seem that setting two forwarding rules to the same server - while it worked - make the router unhappy and when we switched it back, it magically deleted most of the other forwarding rules - definitely not the sort of thing that it was intended to do! Fortunately, a back-up configuration was on hand, but rolling it in required a reboot of the network gear.
Further quieting of VLF/LF RF signal path. As noted in the 7 January entry, there was still noise in the very low (<150 kHz) frequencies being conducted via the power supply. A "new" power supply was installed and this appears to have completely eliminated noise ingress via that path. There is still a bit of low-level noise to be seen on the spectra here and there, but it is markedly cleaner and for the first time in a while, signals from the "Alpha" navigational system (10-15 kHz) and JJY (40 kHz) were easily audible - plus a number of other LF/VLF signals.
WebSDR #5 work: It had been noticed that the absolute sensitivity of the "10M FM" receiver was a bit low, so some adjustments were made on the converter/filter/AGC module that feeds the RTL-SDR for this receiver.
AGC thresholds AGC module adjusted: For the 60 Meter receiver on WebSDR #1 and the 80, 40 and 30/31 meter receivers on WebSDR #3 - which use RTL-SDR modules - there is a quad AGC/Filter block that prevents overload of these receivers. Originally, the AGC threshold had been adjusted such that a very strong signal (e.g. -10dBm) would yield a half-scale peak A/D converter reading. Because the AGC uses an "averaging" detector, it was still possible - in some conditions - for enough A/D clipping events to cause intermodulation to become visible on the waterfall and to be heard in received audio. The thresholds on all of these receivers was reset to quarter-scale A/D for a strong signal, increasing the margin by about 6 dB.

10 January, 2023: Status of the KFS WebSDR in Half Moon Bay, CA

Unless you have been stuck in the wilderness or hiding under a rock for the past few days, you'll know of the severe and disruptive weather recently experienced in north-central California, particularly near-ish the San Francisco Bay area: There has been heavy rain, high winds, flooding, landslides and power outages - and any of these can interrupt service to a web site like KFS, either through loss of Internet connectivity and/or power failure. The Internet service provider, itself, has had to contend with power outages and damage to infrastructure.
On the days of the 8th and 9th of January, the KFS site experienced a large number of power failures of varying duration. While there is a UPS on site, it would appear that either it isn't working properly or, possibly, the power outages were so frequent and of long duration that the battery charge either didn't last, and/or it could never make headway in charging.
It would seem that during this chaos, some of the on-site network gear went offline and it will take a site visit to diagnose and fix what is going on. If it's something very simple, it may be possible to "talk through" whoever might be on-site, but those that normally would handle such issues are either indisposed or out of town, hence the delay in getting it back online.

7 January, 2023: Site work:

During the evening of 6 January and on this day (the 7th of January) several projects were undertaken at and related to the remote Northern Utah WebSDR receive site:

LF/MF Noise floor improvement.

It had been noted that when we rebuilt the coaxial cable entry and lightning protection in the middle of 2022, it was noticed that the noise floor on the 2200 and 630 meter bands on WebSDR #1 (Yellow) and on frequencies below 500 kHz on the KiwiSDR was significantly elevated. If you have been following this page you'll note that we were extremely busy on site in the following months - and since it was summer, with tremendously high lightning static and noise on these bands, it was "out of sight, out of mind" and simply forgotten about until the winter months, where this raised noise floor impacted reception.
A bit of sleuthing was done and two things were found:

A ground loop between the LF/MF/HF combiner and the KiwiSDR stack was introducing significant noise from audio through at least 500 kHz: Most of this was eliminated when a coaxial choke consisting of about two dozen turns on a FT-240-77 core was inserted in this line.
Noise below 150 kHz was still present and it was discovered that when the amplifier/antenna was powered from battery, it cleaned up. A pair of chokes were wound with about 35 turns each on a pair of FT-140-75, introducing several milliHenries of inductance on that line, reducing this ingress by 25-30 dB, essentially eliminating any noise along this path above 100 kHz. A bit more work needs to be done to completely eliminate the remaining noise on a few frequencies below 100 kHz.

USB Card upgrade on WebSDR #2 (Green).

Occasionally, the 15 meter receiver on this WebSDR would go "out into the weeds" causing a "stuttering" - but only the 15 meter receiver . It's hypothesized that the USB port for this receiver is occasionally running out of steam, dropping packets, so we replaced it with a more capable, quad-port USB card that has been proven to be reliable elsewhere.
Doing this required that WebSDR #2 be taken out of service for a while as it had to be completely "de-cabled", removed from the rack, the dust blown out of it, new card installed, reinstalled in the rack and everything relabeled.

Re-cabling of relay site.

On the morning of 7 January we braved a snowy and frozen road to a mountain to the east of the remote receive site where there is a site used to relay to another RF site in the nearby town. The purpose of this visit was to determine the cause of the LAN cable going between the radio that connects the remote receiver site and the on-site router was "flapping" - that is, frequently switching between 1 Gig, 100 Meg full-duplex, 100 Meg half-duplex, and 10 Meg half-duplex. This activity was also accompanied by high packet loss on this link, causing TCP retries from end-to-end between the WebSDR and the user. This may, in part, explain the network issues noted in the 30 December, 2022 entry, below.
On the way up, we had to stop about a half mile from the site due to snow drifts across the road, causing is to carry only the essential tools and supplies, post-holing through the snow.
Our hope was that the cable was damaged rather than the radio failing - and that turned out to be the case: An emergency repair a few months ago to repair some damage to conduit resulted in the "fix" pinching the LAN cable, abrading the jacket causing both water ingress in the jacket which upsets its impedance and balance as well as exposing raw copper to the elements. This cable was replaced in its entirety and rerouted to prevent future damage, causing a complete outage of the WebSDR for about 2 minutes.
The repair successful, we walked back to the Jeep and started backing down about 1/2 mile of now-slushy, muddy road. About halfway down we ran across a "dip" caused by a drainage causing the back end to kick outboard toward the downhill side and I was unsuccessful in getting back on the road. A quick call to a local ham who happens to own a nicely-equipped Jeep with winches, etc. resulted in his appearing about 45 minutes later. With inboard tension applied to the winch cable to bring my Jeep back onto the roadway we did three separate maneuvers to get fully back on the road, allowing me to finish the awkward back-down to a curve near the bottom of that section of road where it was finally wide enough to turn around.
Statistics indicate that the link is once again solid and we hope that this will greatly reduce drop-outs overall.

6 January, 2023: KFS WebSDR connectivity issues

The KFS WebSDR in Half Moon Bay, CA has been experience connectivity issues since the evening of 5 January due to problems being experienced by their Internet Service Provider. There does not seem to be any problem with KFS per se, it's just that the network connecting to it is having problems. While we know that this issue is being worked on, we don't know more details than this.
With KFS being offline, the load on the Northern Utah WebSDR has increased as many of those who normally use KFS have found there way over here so we will do what we can to delay/minimize any outages.

5 January, 2023: WebSDR outages to occur January 6 and 7, 2023.

As noted in the 4 January entry, there is evidence of equipment problems on a mountaintop relay site that connects the remote receive site to the Internet. Barring weather, illness or excessively slick road, work is planned on that site to investigate and repair as appropriate.
This work will likely cause extended outages to all of the remote Northern Utah WebSDR servers - but the "Salt Lake Metro" server will be unaffected.
We will also be working on the RF infrastructure and servers themselves which is likely to cause further, occasional outages.
While we are hoping to get all work done on Friday, January 6, it's possible that based on the difficulty of travel and short days that some work will extend into Saturday, January 7.

4 January, 2023: Comments.

Network instability.

Over the past week, there have been network "issues". The precise nature of the problem has been hard to diagnose as there were several things happening at the same time - including issues with an upstream provider that make it hard to sort things out.
An ongoing problem may be TCP retries caused by a failing physical cable on one the first (of THREE) wireless hops between the remote WebSDR receive site and the fiber landing point. Unfortunately, this cable is atop a (now) snow-covered mountain. The repair of this has been complicated not only by the snow on top, but relative lack of snow on the bottom preventing use of snowmobiles (presuming the availability of such!) but also weather, sickness (there's a lot of "stuff" going around!) and time within several peoples' schedules to make a significant trip like this.
Having said that, work is tentatively scheduled for for a few days hence (possibly January 6 and/or 7) to effect repairs.

Synchronous AM (and "normal" AM) enhanced.

During the server work on 21 December, 2022 a change was made that allows up to 8 kHz of audio response (as opposed to about 4) for AM and SAM (Synchronous AM) reception to improve audio quality. This does NOT affect SSB, CW or FM reception.
When 8 kHz is enabled at the server, SAM now uses a nominal offset frequency of 450 Hz (rather than 150 Hz) as the offset, allowing more variation in AM carrier frequency. This is useful in an AM "round table" where the various stations may be several hundred Hz different in frequency - and the highest allowed offset frequency, which is about 1 kHz when using the normal 4 kHz audio mode is now increased to a bit over 4 kHz, allowing even wider variation - particularly if one purposely "off-tunes" (e.g. a few hundred Hz lower when listening on SAM-U, a few hundred Hz higher when listening on SAM-L).
A modification was made such that when the NCO (Numerically-controlled oscillator - used for Synchronous AM carrier recovery) is unlocked, audio is derived via the "square root of the sum of squares" of the I/Q channels. By doing this, one does not hear the "squeal" as the NCO locks to frequency when it is unlocked. The "lock detection" isn't foolproof so one can sometimes hear the squeal briefly as the NCO "slips" lock - typically on a signal with a lot of QSB, some interference or if it is drifting quickly.
By intent, the NCO will unlock when the frequency, bandwidth or any aspect of the waterfall (position, zoom) is changed: This is done because doing so causes the NCO to unlock, anyway, and by signaling that this is happening, audio disruption is minimized.
Due to the slight amount of NCO leakage, one may hear a tone until the NCO has locked and the notch filter removes it.

For "less-recent" (earlier) events, go to the "Latest News Archive" page - link.

Issues currently being investigated:

Power Line noise: There is an intermittent power line related noise that occasionally shows up - and we are working to resolve this issue - but the system's noise blanker seems to be able to remove most of it. This noise is typically the worst on 80/75 meters, but it seems to disappear at night as the band opens up and the ionospheric noise submerges it. Several poles have been identified

Audio/system drop-outs: There have occasionally been periods where the audio will drop and/or the waterfall will freeze briefly. While this is most often a result of the user's computer (e.g. your computer!) getting busy, pre-empting the browser's audio processing or congestion on your Internet congestion - particularly if you have Internet via Wireless, Satellite or phone - see "Miscellaneous Quirks", below for some causes and work-arounds.

A "pop" in the audio and an accompanying change in signal level: There appears to be an intermittent cross-connection on the antenna between a feed and guy wire that can cause noise in the received signals and levels to fluctuate during very windy periods on site - particularly on the lower (160, 80/75 and the 630M-AM-160M) bands. A similar-sounding - but unrelated - issue (described below) exists with the AM demodulator. Occasionally, this seems to be accompanied by an increase in intermodulation distortion from AM broadcast band signals - a problem that can affect the 75 Meter and lower-frequency bands.

Occasional outages: We are working to "neaten up" the installation so we occasionally have to take something off line to dress a cable, replace a connector, "permanentize" an installation. Tasks like this will cause outages of several minutes duration. Some work is also being done at one or more of the interim sites that provide the Internet connection that occasionally result in outages.

Low-level switching supply "birdies": With lots of computers comes the possibility of lots of QRM from them! Fortunately, there are no "strong" birdies, but there are some that, if they happen to sweep across the frequency to which you are listening, will cause some mild annoyance.

Miscellaneous quirks (e.g. "It's supposed to be that way!"):

If the WebSDR is not on an active window on YOUR computer: If the WebSDR is not the currently active window on your desktop, the computer will give it lower priority and this will make audio drop-outs/waterfall freezes more common. The same thing can happen if your computer is "busy" doing something else, such as other programs, updates, incoming emails, etc. The same is likely true with other platforms (phone, Mac, etc.) The first thing that you should do if you experience drop-outs is to switch to the window running the WebSDR. Don't forget that your own Internet connection/ISP can result in drop-out issues as well. It has been observed that on a typical Windows machine, if the processor utilization is over 65-70%, you may experience occasional drop-outs due to delays in the operating system providing processor time to the code that produces the audio and draws the waterfall.

Waterfall not updating when you switch to another window: When the waterfall is not visible (that is, you have switched to a window and moved the one with the WebSDR in the background) it will stop - which makes sense if you can't see it. What this means is that when you switch back to where the waterfall is again visible there will often be a clear line of demarcation between what the signals were when you switched away and when you switched back.

Occasional burst of noise across the band correlated with strong signals: This is sometimes the result of the noise blanker that is active on all bands being triggered by the peaks of the strongest signal(s) on the band. This effect is most easily spotted on 40 meters during the daytime where there is one signal that is extremely strong - often on the leading edge at the beginning of a transmission - and the band is otherwise quiet. This effect should not be confused with other things that cause similar-looking artifacts, such as static crashes from distant lighting storms or brief signals from ionospheric and ocean wave profilers.

When listening to AM, a sudden "pop" in the audio: It's not actually supposed to do this, but there a "quirk" (bug?) in the AM demodulator that can cause this to happen, occasionally. It seems to happen mainly when the signal level changes very quickly due to QSB (fading) but is less likely to happen on very steady signals or those with only very slow QSB. The only "fix" for this - if it becomes annoying - is to listen on USB or LSB and zero-beat the carrier.

The bands on the "other" server aren't visible to me unless I go to that "other" server: It is this way because there are several independent WebSDR servers.

If you notice some issues that are unrelated to those listed above feel free to use the contact info on the About page to let us know about it.

Additional information:

For general information about this WebSDR system - including contact info - go to the about page (link).

For technical information about this WebSDR system, go to the technical info page (link).

For a list of questions and answers, visit the FAQ page (link).

For more information about the WebSDR project in general - including information about other WebSDR servers worldwide and additional technical information - go to http://www.websdr.org

Back to the Northern Utah WebSDR