WebSDR landing page
WebSDR's four servers
available via the
- Covers the 160,
meter amateur bands, AM
broadcast, the 120,
- Covers the 30,
meter (bottom 1 MHz)
amateur bands and the 31
meter shortwave broadcast bands.
- Covers the 2200,
and 2 meter
amateur bands and the 90,
- This server also serves as a back-up
for WebSDR1's coverage of the very popular 80/75 and 40 meter amateur
bands using lower-performance receivers.
- WebSDR4 ("Magenta")
- Covers the 40, 30, 20,
17, 15 and 10
meter amateur bands using an east-pointing
- For phones and tablets, there is a
simplified, mobile Version of WebSDR #4.
The 2020 Survey results are now
Many thanks to those who
took the time to participate in the 2020 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
issue that had prevented the "iOS Audio Start" button from appearing,
but it may not work in all cases.
If you discover issues that you might think are related to browser
let us know via the contact information on the "About
this WebSDR and contact info"
"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
to: Settings -> Safari -> Request Desktop
Website -> All websites.
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.
For different geographical coverage, here are a
Bay, CA - 160, 80, 40 and 20 meter coverage.
This is the
to the Northern Utah SDR for "local" (e.g. Western U.S.)
- W7NRA, Sedona, AZ
- 160, 80 and 40 meter coverage.
- AI6VN, Maui, HI
- 80, 60 and 40 meter coverage.
Milford, PA - 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.
Washington DC - 2 Servers:
HF/SWBC: - 8 bands that include amateur and
broadcast on the MW/160,
90/80, 60/49/41/40, 31/30, 25/22,
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).
list of WebSDR systems worldwide, go to the websdr.org page.
Dalhonega, GA - 2 bands that include amateur and
broadcast coverage on the 90/80 and 41/40 meter bands..
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:
These are stand-alone HF receivers capable of tuning from
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
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
- KiwiSDRs 1-3 are connected to the
omnidirectional antennas while KiwiSDRs 4 and 5 are connected to the
- To visit a KiwiSDR at the Northern Utah
- 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
400 kHz is via an E-field whip and above this is via the TCI-530
- Click here
to connect to a KiwiSDR connected to the beam antenna (KiwiSDRs 4 and 5).
KiwiSDRs over 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.
- Again, please refrain from using
a KiwiSDR to listen to a frequency/mode already supported by the main
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.
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
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
- This site provides at-a-glance graphs of noise plots on the
participating bands and receive sites.