Software Defined Radio Receivers (SDR) located in many parts of the
world and hooked up to incredibly efficient high gain antennas can
easily be selected and accessed at:
https://skywavelinux.com/best-sdrservers.html
http://www.websdr.org/
This information that Tom W1TP sent along is from Claudio
Ruggieri, IZ0KRC.
The SDR in Trecastelli, Italy is at:
http://iw2nke.ddns.net:8073/?f=10000/-4000,4000amz10
If you type in the frequency you want to listen-to in the upper left
white box in the frequency and parameters screen on the lower right
your radio will be tuned to that frequency. You can play with
the other parameters such as selecting CW (Continuous Wave) for
Morse code transmissions or SSB for single sideband transmissions.
The waterfall spectrum display will show you the signals on the
frequency you selected and other transmissions above and below that
frequency.
It is a fascinating new world for those of us who are used to tuning
big knobs attached to huge radios and putting up ridiculously huge,
complex and unsightly antennas; often in horrible weather
conditions.
Last night I listened to some communications, in the links there are
some short clip on 7.933 MHz of the Russian army in Ukraine.
Dial up the frequencies if you want to listen in today.
While I was listening I used the google voice translator live, The
partial meaning of talks for example are about helicopters, problems
with ice on the wings, communication problems that improve as they
approach to the depot.
The communication is only partially translated due to the high
interference during reception and the various propagation
disturbances.
In the recording, the signal of the second correspondent is heard
quite well towards the end of the listening due to the fading out of
the interfering signals.
https://www.youtube.com/watch?v=hwHXP1OwSNQ
https://youtu.be/eEnV7TwmoWM
https://youtu.be/JPoJtVMIYr4
In a video begins the Jamming Ukrainian on communications and then
nothing more.
https://youtu.be/Se3PHgPbqz0
Others listening to 7.930 is in SSB (USB) to also listen to voice
communications.
On the frequencies there was an alternation of cw and SSB
transmissions.
Some friends yesterday also listened to communications on the
frequency of 7.932 and, 7.920 (say Ukraine) and 4.220 and 4.681
Russian Federation.
I'm surprised that they do not use satellite for communications or
encrypted these with radio communications.
In WWII I believe they may have had spectrum displays like the one I
had as a young ham radio operator in 1953. They were made by the
Panadapter Corporation and I believe first patented by Singer. They
showed the radio spectrum as a horizontal line on a cathode ray tube
screen with signals shown as upward deviations of the horizontal
line.
The waterfall display of an SDR is somewhat similar but it looks
just like a waterfall so that Time is shown as the downward movement
of the spectrum. Noise makes it look like a waterfall and brighter
colored areas indicate the presence of a signal. You can tune
to each signal by moving a cursor. With a panadapter, you were
always listening to the middle of the spectral display and could
tune your radio receiver to bring signals into the middle of the
display.
You can see my W1TP TELEGRAPH & SCIENTIFIC INSTRUMENT MUSEUMS at
http://w1tp.com/
73
Tom W1TP
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