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Author Topic: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC  (Read 11403 times)

Offline KM0NAS

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #30 on: April 21, 2020, 1356 UTC »
I ran TDoA on the signal last night and agree that it is coming from the Khabarovsk area. The Russian Navy transmitter site RAB99 is within the heat map of the signal and seems the most likely transmitter site to me.




Since my best heat map showed more of a bullseye on the Bolshekhekhtsirsky Reserve though just to the East though I decided to check it out on Google maps just to see if there was an obvious transmitter site I was missing.

There is a standard microwave radio tower in the middle of the park (likely on a high spot) and something else caught my eye (unrelated to the signal). There are two sites with similar buildings and fencing. They seem excessively heavily guarded. Each site has a series of four closely spaces gated fences and then a fifth perimeter fence around that. This seems excessive for a simple mining operation. My first assumption was an ICBM site but it does not appear to be listed as one online in this area. I wondered if they could just be underground mine entrances but then I would expect large tailings piles.  Any thoughts?


*KM0NAS*
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20 meter dipoles @ 40' height
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Offline ulx2

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #31 on: April 22, 2020, 1830 UTC »
Seems like this sample is used:

http://www.radiojamming.puslapiai.lt/sound/sound_speechresembling.mp3

There is looped recording with two mixed fragments of female and male voice speeches taken from programs of USSR All-Union Radio (the audio is NOT encrypted).

This sample is presented on Rimantas Pleikys' website, dedicated to deliberate radio jamming, as:
Speech-like signal (USSR 1976-1988, USSR/Poland  1980-1988)
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline Josh

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #32 on: April 22, 2020, 1853 UTC »
Seems like this sample is used:

http://www.radiojamming.puslapiai.lt/sound/sound_speechresembling.mp3

There is looped recording with two mixed fragments of female and male voice speeches taken from programs of USSR All-Union Radio (the audio is NOT encrypted).

This sample is presented on Rimantas Pleikys' website, dedicated to deliberate radio jamming, as:
Speech-like signal (USSR 1976-1988, USSR/Poland  1980-1988)

With the above in mind, as well as the tdoa near a naval facility, my rubles are on these guys;
https://planesandstuff.wordpress.com/2019/09/09/murmansk-bn-hf-ew-complex/
We do not encourage any radio operations contrary to regulations.

Offline ulx2

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #33 on: April 22, 2020, 2144 UTC »
The Soviet Union and its East European allies used six types of the jamming audio signals:

1.      To block out the "most anti-Soviet" stations, a wide spectrum electronically generated noise signal was used. RFE/RL, Voice of Israel, and Radio Tirana would experience this type of jamming.

2.      On August 3, 1964, one more source of interference was invented - Radio Mayak program, transmitted in FM mode and heard distorted on domestic receivers - to jam some "grey propaganda" stations such as VOA, BBC, Deutsche Welle, and R. Beijing.

3.      In 1976, Soviets started to use the speech resembling signal. Its advantage was that it conformed to the timbre of the human voice. This jamming sound, which used to be played back from open reel tapes, was composed of two voices of male and female Russian announcers.

4.      A unique case was the Polish service of RFE/RL: from 1971 until 1980 only light instrumental music was employed to jam it, both in clear AM and distorted FM modes.

5.      East Germany aired its domestic radio programs via medium wave transmitters tuned in to several hundred Herz outside of the RIAS frequencies.

6.      Czechoslovakia used the swinging carrier, also known as wobler, AM transmitters to jam RFE/RL.


"Radio Jamming in the Soviet Union, Poland and others East European Countries" by Rimantas Pleikys.
« Last Edit: April 22, 2020, 2206 UTC by ulx2 »
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline KM0NAS

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #34 on: April 23, 2020, 0408 UTC »
I'm case anyone is curious I found out the reason for the multiple layers of fencing around the buildings in the photo I posted. The site is part of the Korofskiy Nuclear Storage Facility aka Khabarovsk-47. Not a place you want people casually walking into. These buildings were far away from the main buildings and likely contain some pretty nasty materials. Unrelated to the signal being discussed but interesting.
*KM0NAS*
Yaesu FT-891
Kenwood TS-570D
Soft66RTL2
40 meter dipoles @ 40' height
20 meter dipoles @ 40' height
10 meter vertical @ 16' height
Beacon MN on 13562.8

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #35 on: April 23, 2020, 1446 UTC »
Seems like this sample is used:

http://www.radiojamming.puslapiai.lt/sound/sound_speechresembling.mp3


ulx2, nice find, that does seem to be the source.  I will look at it closer this afternoon to confirm it is the same, but it does appear to be.  Did you discover this yourself or did someone else point it out to you?  I will probably kick out a new video on the signal today or tomorrow and want to credit the right people.

T!
T!
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Offline ulx2

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #36 on: April 23, 2020, 1733 UTC »
Hi, Token. Yes, I found this by myself. I just recalled that I have already heard this sound formerly.
Now I compared this sample with your recording once again, and I'm sure they are identical: I hear the same words.
« Last Edit: April 23, 2020, 1822 UTC by ulx2 »
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #37 on: April 23, 2020, 2015 UTC »
Hi, Token. Yes, I found this by myself. I just recalled that I have already heard this sound formerly.
Now I compared this sample with your recording once again, and I'm sure they are identical: I hear the same words.

I was sure I had heard that sound (the one on 9024 kHz DSB) before myself, and I had looked at that jammer web site a long time ago.  However, I never connected the two, I just knew the 9024 DSB was familiar in some way.

T!
T!
Mojave Desert, California USA

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #38 on: April 24, 2020, 0020 UTC »
Hi, Token. Yes, I found this by myself. I just recalled that I have already heard this sound formerly.
Now I compared this sample with your recording once again, and I'm sure they are identical: I hear the same words.

I overlayed spectrograms of the two sources, from the web site and from my recordings, and they are absolutely identical and exactly the same length.  I suspect whoever is transmitting this today actually got the audio from that web site.  The original jammer was not just a 20 second loop like this.

T!
T!
Mojave Desert, California USA

Offline ulx2

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #39 on: April 24, 2020, 0105 UTC »
I overlayed spectrograms of the two sources, from the web site and from my recordings, and they are absolutely identical and exactly the same length.  I suspect whoever is transmitting this today actually got the audio from that web site.  The original jammer was not just a 20 second loop like this.

T!

I agree. I also think, the audio is not being played from original tape nowadays.
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #40 on: April 24, 2020, 0353 UTC »
New video up on my YouTube site.  I compare the received audio to the audio form the jammer web site.

https://www.youtube.com/watch?v=pFeGhR3_yXo

T!
T!
Mojave Desert, California USA

Offline KM0NAS

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #41 on: April 24, 2020, 1522 UTC »
Lol, I also put up a new video on this one last night. Gave you credit for finding it of course and put a link to your initial video in the description.

https://youtu.be/tmRqzk7i3JY

*KM0NAS*
Yaesu FT-891
Kenwood TS-570D
Soft66RTL2
40 meter dipoles @ 40' height
20 meter dipoles @ 40' height
10 meter vertical @ 16' height
Beacon MN on 13562.8

Offline Strange Beacons

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #42 on: April 24, 2020, 1523 UTC »
Nice work figuring this signal out, everyone.

It is this kind of research and dedication that keeps me in love with this forum. 🥰

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #43 on: April 24, 2020, 1538 UTC »
Not implying or suggesting any kind of connection at all, but it might be worth noting that Russian Electronic Warfare folks would have recognized / celebrated "День специалиста радиоэлектронной борьбы" (Electronic Warfare Specialist Day) a bit over a week ago, on April 15.  This is a recognition of the importance of a specific early EW event during the Russo-Japanese war in 1904, and in general to the importance of EW to combat capabilities.

T!
« Last Edit: April 24, 2020, 1541 UTC by Token »
T!
Mojave Desert, California USA

Offline Token

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Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC
« Reply #44 on: April 27, 2020, 0206 UTC »
Going over my logs I realized that I have seen, in the past, Link-11 on all 4 of the frequencies I saw the DSB Oddity on.  I did not see all those freqs in use by Link-11 while the DSB thing was on, but they have all supported Link in the past.  I did see Link-11 on 9022 kHz while the DSB Oddity was on 9024 kHz, so there was a slight overlap there.

But all 4 freqs, 5708, 9008, 9022, and 9024 kHz, have all been tuned freqs for Link-11 in the past.

As Link-11 can be DSB or ISB, it would take a jammer with enough width to cover both sidebands to be effective against Link.  By definition this signal had enough width.  It also did not waist energy on lower audio frequencies where Link-11 would not be.  At a guess, this signal would be at least moderately effective against Link-11.

But I really have a problem believing this looped audio clip from the Internet would be an "official" jam technique.

T!
« Last Edit: April 27, 2020, 0213 UTC by Token »
T!
Mojave Desert, California USA

 

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