Northern Utah WebSDR landing page

Notice to Firefox users:  You must now press a button to get audio on a WebSDR!

As of Firefox version 103 (late July, 2022) it is now required that the user do something  - like click a button. - to enable audio and video on many web sites, including WebSDRs.  The immediate result was that it "broke" audio for WebSDR users that use the Firefox browser.  Users of the Chrome and Safari browsers have already had to do this for some time.

The Northern Utah WebSDR servers now have a Firefox/Mozilla audio start button that Firefox users MUST press to get audio.  If you do not wish to press that button every time you load the WebSDR page, please follow the instructions HERE.
The Northern Utah WebSDR's servers may be found at the links below:

The 2021/2 Survey results are now available:
Many thanks to those who took the time to participate in the 2021/2 survey:  Your feedback helps us improve the system - An analysis of the results may be found here.
Having trouble getting WebSDR audio on some Apple devices?

If you are running an APPLE device and/or using the CHROME browser, make sure that you click on the START button, above and to the right of the waterfall.

Having said that, there are occasional reports that users running Apple iOS 13 have have trouble getting audio on WebSDRs and KiwiSDRs.  While changes have been made to the Northern Utah Utah WebSDRs to fix an issue that had prevented the "iOS Audio Start" button from appearing, but it may not work in all cases.
  • Possible "no sound on iOS 13" work-around if the "START" button does not work:
    • The configuration change below has been reported to work for at least some users of iOS 13 devices using the Safari.  Do this ONLY if you don't get either audio or the "iOS Audio Start" button when using your iOS 13 device.
      • Go to: Settings -> Safari -> Request Desktop Website -> All websites.
        • "All websites" is enabled by default.  Disable this setting and try your favorite WebSDR systems.
  • If the above doesn't help,  READ HERE and HERE for more information about this issue.
If you discover issues that you might think are related to browser compatibility, please let us know via the contact information on the "About this WebSDR and contact info" page.

Other WebSDR systems

For different geographical coverage, here are a few selected WebSDRs:

Western U.S.:

  • KFS, Half-Moon Bay, CA  80, 60, 40, 30, 20, 17, 15 and 10 meters.  This is the best alternative to the Northern Utah SDR for "local" (e.g. Western U.S.) coverage.
  • W7NRA, Phoenix, AZ - KiwiSDR (Limited number of users). 
Eastern U.S.:
  • K3FEF & W3TKP , Milford, PA - 2 Servers:
    • K3FEF/W3TKP HF/SWBC- 7 bands that include amateur and broadcast on the MW/160, 90/80, 60/49/41/40, 31/30, 25/22, 20/19 and 17 meter bands.
    • K3FEF/W3TKP  VHF - 6 bands that include much of 10 meters, a portion of 6 meters and 2 meters 
  • NA5B near Washington DC - 2 Servers:
    • NA5B HF/SWBC:  - 8 bands that include amateur and broadcast on the MW/160, 90/80, 60/49/41/40, 31/30, 25/22, 20/19, 15/13 and 11/10 meter bands
    • NA5B VHF:  4 bands that include:  6 Meters (50-52 MHz), Air band (119-121 MHz), 2 meters (approx. 145.35-147.40) and NOAA Weather Radio (approx. 162.1-163.9 MHz).
For a complete list of WebSDR systems worldwide, go to the page.
Other things going on at the Northern Utah WebSDR

In addition to the WebSDR receivers, there are a few other things going on at the Northern Utah WebSDR, including:
  • KiwiSDR receivers.  These are stand-alone HF receivers capable of tuning from near DC to 30 MHz, continuously, and are capable not only decoding normal "voice" modes (USB, LSB, AM, FM) but they also have the capability of decoding other types of signals - including RTTY, FAX, SSTV (Slow-Scan TV), and decode CW.  These receivers are also part of a TDOA (Time Direction of Arrival) network that allow the approximate locations of received signals to be determined.  
    • Please note that these receivers can only support a few users at a time so please refrain from using them when receiving on a frequency/mode that is already supported by the main WebSDR system!
    • For more information about the KiwiSDRs, read HERE (link).
    • KiwiSDRs 1-3 are connected to the omnidirectional antennas while KiwiSDRs 4 and 5 are connected to the east-pointing beam and Kiwi #6 is connected to the northwest-pointing beam..
    • To visit a KiwiSDR at the Northern Utah WebSDR:
      • Click here to connect to a KiwiSDR connected to the omni antenna (KiwiSDRs 1-3).  These KiwiSDRs cover from a few kHz to 30 MHz.  Coverage below approx. 400 kHz is via an E-field whip and above this is via the TCI-530 omnidirectional antenna.
      • Click here to connect to a KiwiSDR connected to the east-pointing beam antenna (KiwiSDRs 4 and 5).  These KiwiSDRs cover from about 6 MHz to 30 MHz owing to the limitations of the beam antenna:  Coverage below 6 MHz is possible, but sensitivity is increasingly poor with lower frequency.
      • Click here to connect to a KiwiSDR connected to the northwest-pointing beam antenna (KiwiSDR 6).  This KiwiSDR covers over from about 10 MHz to 30 MHz owing to the limitations of the beam antenna:  Coverage below 10 MHz is possible, but sensitivity is increasingly poor with lower frequency.
    • Again, please refrain from using a KiwiSDR to listen to a frequency/mode already supported by the main WebSDR system.
  • "All band" WSPRNET monitoring.  Using the KiwiSDRs in conjunction with scripts running on another local machine there are virtual receivers monitoring the WSPR bands on all LF, MF and HF amateur bands (e.g. 2200, 630, 160, 80, 60, 40, 30, 20, 17, 15, 12 and 10 meters) using the callsign "KA7OEI-1".  These receivers are using the excellent antenna system on site to receive, decode and contribute WSPR spots and forward that information to the WSPRNET (link) web site where the results are aggregated and made publicly available.
  • HF Noise monitoring.  Also using the KiwiSDRs - and related to the WSPRNET monitoring - the HF noise floor is also being monitored at this site.  The results of this may be analyzed to discern band openings, the influences of the sun's activity, lightning static - and perhaps a few other things related to HF propagation and the Earth's geomagnetic field.  Results of this monitoring may be seen at the following links:
    • Grafana Noise Dashboard - This link automatically selects the Northern Utah WebSDR system and the 10, 20, 40, 80 and 630 meter bands - use the drop-down menus to select specific bands and/or receivers of interest.
    • WSPRdaemon - This site provides at-a-glance graphs of noise plots on the participating bands and receive sites.
Northern Utah WebSDR Logo - A skep with a Yagi
The Northern Utah WebSDR now has a YouTube channel - see it here!

Help support this WebSDR system:

Find out how to donate!

Donate via PayPal - or via cash/check/etc. if you don't wish to use PayPal

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The Northern Utah WebSDR is a non-profit 501c(3) organization
About this WebSDR and contact info
Technical Information
Hardware, software and related articles
Scientific Research at the Northern Utah WebSDR
Latest News and known issues
Northern Utah WebSDR FAQ
Are you having AUDIO PROBLEMS with a WebSDR?
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Featured Project:
Automatic computer audio muting for your HF transceiver.

Stop being driven crazy by the echo and eliminate the need to manually mute the WebSDR audio when you transmit!

Find out more!

Lightning cloud
Ever wonder where those static crashes are coming from?

Go to the live lightning map at the web page and find out!

The Northern Utah WebSDR
is operated by a group of volunteers in conjunction with a non-profit organization set up specifically for the support of the WebSDR.

  Many of these volunteers are members of other local amateur radio clubs, but the Northern Utah WebSDR itself is not associated with any of these clubs.

See the about page for more information.

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