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 miles (94km) 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" server):
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 120, 60 and 49 meter shortwave broadcast bands.
- WebSDR #2 (the "Green" server): This
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): It 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. Finally, it covers the "new" 630 Meter amateur band and
adjacent frequencies: Like 160 meters, 630 meters is primarily a
"winter" band due to the crescendo of noise that accompanies the summer
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.
- Note: If
you are listening to amateur, mediumwave or SWBC frequencies that are
already covered by a WebSDR server, please listen there instead of a
KiwiSDR: Not only can the WebSDR servers handle many more users,
but its receivers are likely to be a bit better than those on the Kiwi!
Purpose 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 the
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 be
found in almost anything that is powered from the AC mains, from
appliances to chargers to TV and computers. Even if one, single
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 from
"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" tests
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 large number
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
In other words, a system like this can provide a bigger
"bang for the buck" and benefit to more people than any other remotely accessible receiver
- 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" web page.
- 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 Northern
Utah with many locals offering support by donating equipment, their
time and money. This WebSDR is not associated with any particular
How can I donate to support this system?
Any monetary donations will be
gratefully accepted and the easiest way to do that is via PayPal using
the link below:
If you don't want to use PayPal and, instead, you wish to donate in another way (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..
Acknowledgements of donations:
We would sincerely like to thank the following for their very kind $$$ donations.
Ron J.; Bill G.; Pat O.; Bill L.; Sid B.; Jim P.; Robb K., Rick L.
There have been been donors in addition to those above and we thank
them for their help! While we have configured PayPal to
automatically notify us when someone donates, it doen't usually work so
we have to log in and see - please bear with us - we'll acknowledge as soon as we can.
amount - large or small - is very much appreciated and it helps keep
the system running, not to mention the possibility of further enhancing
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 is
pointed due east. We are hoping to make this antenna usable and add
receivers to use it exclusively to enhance coverage on these bands to the
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 and MF 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 120, 60, 49, 31, 25, 19 and 13 meter shortwave broadcast
bands because many of these were conveniently proximate to amateur bands. Some of the SWBC bands that we don't (yet?) cover are 41, 22, and 16 meters.
- We would like to add additional "wideband" coverage receivers to allow some users to tune across the entire HF spectrum.
Why are there 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 zero.
- Electricity. We
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!
- Antenna maintenance. The antenna(s) on site do need maintenance - particularly since they are decades old.
- Internet connectivity. Like electricity, Internet connectivity is not free - particularly considering the speed/data usage requirements of a WebSDR.
- Maintaining equipment.
To get it online, a lot of computer, radio and networking gear
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 what?" In
the future we'll be upgrading, fixing, maintaining - and some
of these things we won't know about until they happen! Of course,
what sort of future upgrades can occur depend on resources available.
To 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
have any 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 will all of these ads, it is your computer that loads them, not the WebSDR itself.
- NONE 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!
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 Clint, KA7OEI using the callsign at arrl dot net. (Example: If my call was "wh2xyz" the email address would be "email@example.com".)
If you wish to contact me, 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 me to reply, please have the courtesy to allow me 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 your email address, anyway!
- For answers to possible questions, 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
Go to the Northern Utah WebSDR