the Northern Utah WebSDR server(s)
This WebSDR server is located near Corinne, Utah, at a site
previously used for HF propagation research. It is about 60
north of Salt Lake City and 14 miles (23km)
east of the Golden Spike National Historic site where, in 1869,
the first transcontinental railroad was completed, linking the eastern
and western United States by rail for the first time.
receive antenna at this site is a TCI Model 530 omnidirectional Log
Periodic which is (mostly)
circularly-polarized and optimized for higher-angle incident waves,
having up to 6dBi gain. Go
to the "Technical
Info" page for more detail about the gear used at this site.
This WebSDR system was put online at this site on 28
February, 2018 with the
help of many local amateurs.
There are several WebSDR systems online at this location offering
coverage on all
of the U.S. MF and HF amateur bands:
- WebSDR #1 (the "Yellow"
This server covers the lower amateur bands - those that are
active all day or only at night, namely 160, 80/75, 60 and 40 meters,
along with the AM broadcast band and the 120, 60 and 49 meter shortwave broadcast bands.
- WebSDR #2 (the "Green"
covers the higher amateur HF bands - those that are active mostly
during the day and/or when solar terrestrial conditions permit such as
30, 20, 17, 15, 12, 10 and the bottom 1 MHz of 6 meters, along with the
31 and 13 meter
shortwave broadcast bands.
- WebSDR #3 (the "Blue" server):
also includes all of the 2 meter amateur
band using a 5 element Yagi pointed south toward the Salt Lake metro
area along with the 25 and 19 meter shortwave broadcast bands.
On this server there is also redundant
coverage of the very
popular 80/75 and 40 meter amateur bands so that it can
serve as a (lower-performance,
but usable) back-up to WebSDR #1 should it fail - and with
these bands we also get the 90 and 41 meter SWBC (shortwave broadcast)
bands for "free".
Finally, it covers the "new" 2200 and 630 Meter amateur bands
adjacent frequencies: Like 160 meters, 2200 and 630 meters
"winter" bands due to the crescendo of noise that accompanies the
Another type of Web-interfaced, multi-user SDR system at this site uses
KiwiSDRs that (theoretically)
have continuous coverage from 0 through 30 MHz. For more
information about those receivers read the
KiwiSDR section on the FAQ page.
and the Northern Utah WebSDR:
- Note: If
you are listening to amateur, mediumwave or SWBC frequencies that are
already covered by a WebSDR server, please use the WebSDR instead
KiwiSDR: Not only can the WebSDR servers handle many more
but its receivers are likely to be a bit better than those on the Kiwi!
This WebSDR system also functions as a major monitoring point for
WSPRNET activity in North America, receiving and reporting WSPR
transmissions on the LF, MF and HF spectrum. Please read
the page "WSPR Monitoring at
the Northern Utah WebSDR" for more information.
of this WebSDR system:
One of the growing challenges of amateurs that
wish to operate on HF is that of dealing with the crescendo of QRN at
typical home QTH, largely owing to the proliferation of devices that
are, in their own right, power oscillators - namely, devices with
switching power converters. Now ubiquitous, these devices can
found in almost anything that is powered from the AC mains, from
appliances to chargers to TV and computers. Even if one,
device contributes relatively little to one's own receive noise floor
on a given band, the sheer number of these devices - both in your
residence and those of your neighbors - may contribute to the overall
degradation of your receive capability, masking out weaker signals.
No matter your circumstance there are several reasons why you might
frequent a WebSDR:
It should be noted that there are some instances where a remote receive
system may be of limited benefit - specifically, some contest
situations where there may be rules that limit/prohibit the use of such
- If you do
have a noisy station, a remote receiver can augment your own -
particularly when it comes to digging out weaker signals.
- If you plan to just listen, it may be more convenient to do
so from your computer or mobile device.
- If you are participating in a round table or net, listening
"somewhere else" may allow you to hear stations that might not be
audible for some reason - such as your being so close that the signal
skips over you, too far to hear that station or just
due to band conditions.
- To test your
transmit antenna - or compare several antennas. Remember:
Conditions change, so one would usually do several "A-B"
rather than just one.
- A "sanity" check of your station: If you hear
nothing on your home station, you can tell if the band is dead.
- If you just want to "listen" - whether you have your own
station or not!
Having the availability of a "good" receiver site - that is, one that
is "RF quiet", when coupled with a system such as a WebSDR can provide
a wider benefit to a far larger number of amateurs than a single,
dedicated remote receiver. This system can accommodate a
of simultaneous users, each independently tuning around and thus
benefit the greatest number of users - not only from locations near
the WebSDR system itself, but also those across the country and across
other words, a system like this can provide a bigger
"bang for the buck" and benefit to more people than any other remotely
- Starting on a
specific band/frequency/mode: If you want this
to start on a particular frequency and mode, append "/?tune=<freq
in kHz><mode> to the end of the URL as
in: http://ip.address/?tune=7200lsb .
Valid modes are LSB, USB, AM and CW. After bringing
web page with this URL you may save it in your bookmarks - but remember
to name it to include the frequency and mode!
- Using the
"memories": You can save frequencies using the
"memory" functions on the web interface. Please be aware
that these settings are saved as cookies in your
browser, on the machine that you are using and NOT on the
What this means is that if you change machines or use a
browser program, these "memories" will not be carried over.
Furthermore, many browsers can be configured to erase cookies
when the program is shut down so if these memories don't "stick" it
will be up to you to figure out why.
drop-outs: Audio drop-outs are not uncommon if you have multiple browser
tabs open - including the WebSDR page - and you have changed
to another browser tab or window. Navigating away from the
browser window with WebSDR tends to lower the priority of that
non-active window which means that real-time audio processing can
suffer - even if you are using a very fast machine!
- Note that WebSDR servers 1, 2 and 3 have a button labeled
"Additional Audio Buffering" that can help reduce dropouts at the
expense of adding a bit more delay.
The waterfall may stop updating when you switch/minimize the
browser window such that it is no longer visible on-screen, causing
signals to appear/disappear when you switch back to the WebSDR and the
waterfall resumes updating. This is not
a bug but rather a means of reducing bandwidth/load on the server.
problems: If you can't see the waterfall and/or
can't hear any audio make sure that you aren't blocking scripts.
If you are using an older browser, consider upgrading.
If you are using the Chrome
browser and having audio problems, read the "Fixing audio with Chrome"
- Important note: You need both Java
page to work properly - particularly on older browsers. For a
detailed discussion about browser support, click here.
digital modes: While there are no decoders on
the WebSDR system for
digital modes like PSK31 and RTTY (the
processor load and system complexity would increase significantly!)
it is possible to use a program like "Virtual Audio Cable" to
route audio from the WebSDR running on your computer into such
applications. Note that some modes like WSPR, JT-65, JT-9 and
FT-8 require tight synchronization to UTC and the delay in processing
and propagation across the Internet - plus the possible, occasional
drop-out and re-sync of the audio stream - may make the reception of
such modes unreliable.
Who's behind all of this?
The installation and maintenance of this WebSDR system is a joint
effort of an informal group of amateur radio operators in
Utah with many locals offering support by donating equipment, their
time and money. This WebSDR is not associated with any
Helping to support the Northern Utah WebSDR:
If you wish to donate (check, money order, gold
bullion, cash in an envelope...) see the contact
information below and send an email letting me
know what you have in mind. (The PayPal link has been disabled for the time-being - it will be re-enabled after we get our connectivity issues sorted out.)
Acknowledgements of donations:
We would sincerely like to thank the following for their very kind $$$
Bill G.; Pat
O.; Bill L.; Sid B.; Jim P.; Robb K., Rick L.,
S., K7OW; Rick W.; Steve J.; James S.; USAF Flyer's Net; Ed C.
There have been been donors in addition to those above and we thank
them for their help!
amount - large or small - is very much appreciated and it helps keep
the system running, not to mention its further enhancements.
- While we have configured PayPal to
automatically notify us when someone donates, it doen't usually work
for some reason so
we have to log in and see: Please bear with us - we'll
acknowledge donations as soon as we can.
Again, we wish to thank all of those who donated equipment, their time
and/or money to make this system possible.
What are the future plans?
To make it better, of course! In the future we hope to:
- Resolve technical issues - see the "Latest
News" page for currently-known issues to read
about past problems.
- There is another antenna
on site that is NOT in
use at the moment - a large Log-Periodic antenna covering 6-30 MHz that
pointed due east. We are hoping to make this antenna usable
receivers to use it exclusively to enhance coverage on these bands to
Eastern U.S. and covered "DX" areas of the world.
- We are looking into adding additional services such as a
Skimmer, WSPR monitoring, etc.
- We now have
coverage on all of the U.S. HF, MF and LF amateur
bands! Cover some/all of the
HF bands that we do not yet cover.
- Add more of the "popular"
shortwave broadcast bands. We
currently have the AM broadcast band and the 120, 90, 75, 60, 49, 41,
19 and 13 meter shortwave broadcast
bands, some of these being covered because they are conveniently
proximate to amateur bands. Some of the SWBC bands that we
don't (yet?) cover
are the 90, 41, 22, 16. 15 and 11 meters. (All of these bands are, in
fact, covered by the KiwiSDRs.)
- We would like to add additional "wideband" coverage
receivers to allow some users to tune across the entire HF spectrum.
- If you have some (reasonable!)
suggestions for frequency coverage, drop us a line: If it
makes sense, we'll at least think
about trying it!
Why (have) there been
ads on these WebSDRs?
A WebSDR is not a
natural resource! To keep this WebSDR online there are some
"fixed" expenses that we need to cover:
While we'd rather not have any ads at all, they are one way of
providing a portion
of the money that we'll need to keep this WebSDR running - and we'll
try to make them as unobtrusive as possible. If you run
blocker on your browser we do understand why, but consider "allowing"
the ads on this site.
- Site rental.
While have a good rapport with the land owner, our
rent is definitely not
have been paying for the electricity out of our back pockets so far -
and getting the power (re)connected to the site after it had been
abandoned for a decade or so wasn't cheap!
maintenance. The antenna(s) on site do need
maintenance - particularly since they are decades old.
connectivity. Like electricity, Internet
connectivity is not free -
particularly considering the speed/data usage requirements of a WebSDR.
To get it online, a lot of computer, radio and networking
had to be brought together - and this was paid for out of our back
pockets: We could have bought a pretty nice HF rig for the
amount that was spent!
- Getting there.
As you may know, this site is in rural Utah, requiring 7-10
gallons (30-40 liters)
of gasoline for a round trip to from Salt Lake City where several of
our key people live. (We'll
let you do the math on this one!)
Thusfar, fuel and vehicle wear and tear has been willingly
donated - but like many other things we've done so far, it still comes
out of our back pockets.
- "Who knows
the future we'll be upgrading, fixing, maintaining - and some
of these things we won't know about until they happen! Of
what sort of future upgrades can occur depend on resources available.
be absolutely clear:
- We will be
pleasantly surprised if we can completely cover the
WebSDR's power bill and a portion of the site rental with ad revenue
which is why we also encourage donations. None of us
will actually be making money on this - we are hoping that it will
cover at least some of our ongoing expenses.
- We don't
say as to what type of advertisement is presented. As is
true of most Internet ads, cookies left on your
computer from your previous
browsing can influence the types of ads that you see. As with
all of these types of ads, it is your
computer that loads them, not the WebSDR itself.
of the ads that might appear on the WebSDR's web page(s) imply any
endorsement by us at the Northern Utah WebSDR, the author of the WebSDR
software or anyone else: As we stated above, we don't choose the ads, and we
have no way of knowing which ads appear on your computer!
Ads have been disabled
during the transition to the new ISP. We are in the process of
evaluating whether or not we will resume ads in the future.
If you wish to find out how you can contribute to this project, or if
you have any questions/comments that weren't answered on the "latest
news", "FAQ" or "technical
info" pages, you may
send an email to the following address: sdrinfo at sdrutah dot org - say it aloud if it doesn't make sense. Alternatively, you can send email/snail-mail to KA7OEI using the information found at QRZ or the FCC database.
If you wish to contact us,
please avoid using an email
service that has one of those "Please fill in this form to reply" type
of SPAM filters.
If you really
want a reply, please have the courtesy to allow us to do so without
having to fill out a form and supply extra personal
information to who knows where, etc. - I wasn't planning to sell or give out your
email address, anyway!
- For answers to possible questions, visit the FAQ
- 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
Go to the Northern Utah WebSDR