Messages

241

HF Mystery Signals / Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC

« on: April 07, 2020, 0248 UTC »

And today, 07 April, 2020, the signal cam online sometime around 0220 UTC or so, but on a different frequency.  The format, timing, apparent content is the same, however the frequency tonight is 9007 kHz.

T!

242

HF Mystery Signals / Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC

« on: April 06, 2020, 0229 UTC »

This signal is up again right now, 06 April, 2020, 0220 UTC.  It appears to be identical to what it was in the video I posted.

T!

243

Utility / Re: Unidentified Military Comms 5757 USB 04:01 UTC 2 April 2020 (now with audio)

« on: April 05, 2020, 1318 UTC »

Heard callsigns  "straight flush" and "95 euchre" used and starting approximately at 9:11 of recording heard "turn left and go high at Wildcat Mountain".

I think "Straight Flush" was not a callsign, I think it was a threat callout.  I also heard them mention "Roland".  And I also heard them say something about "unable to track us through the clouds".  Both Straight Flush and Roland are radar guided SAMs (Surface to Air Missile) systems.  If they were over a training range, say over UTTR, it is very possible there were simulated SAMs on the ground engaging them.

T!

244

Utility / Re: Unidentified Military Comms 5757 USB 04:01 UTC 2 April 2020 (now with audio)

« on: April 05, 2020, 1313 UTC »

Nice jasmine, I have not reduced my receptions of this signal to audio yet, they are still in SDR format.  I started receiving this around 0320 UTC or so, and the last transmissions I heard were around 0650 UTC or so.

Sounds like aircraft over UTTR.

T!

245

HF Mystery Signals / Re: 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC

« on: April 05, 2020, 1308 UTC »

Sounds to me like Asian male and female voices reading news or something else, recorded and then transmitted as dsb or exalted carrier am for whatever reason. Tdoa? Jammer testing?

I tried to TDOA the signal, however too few receivers had it with sufficient quality to get a good result.  Lots of receivers heard it, but for most it was weak enough that Kiwi TDOA was not going to work well and the results I got were all over the place, but mostly within the US, concentrating towards the south west.  I would be very careful with that possible source region though, the plots were not confidence inspiring.  Call the region a "maybe".

T!

246

North American Shortwave Pirate / Re: Wolverine Radio 6930 USB 0056 UTC 05 APR 2020

« on: April 05, 2020, 0121 UTC »

Sounds really good into the Mojave Desert of California tonight.  S8 or more, and nice audio, as normal.  On the house sound system now, and wife enjoying the music also.

T!

247

HF Mystery Signals / 9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC

« on: April 04, 2020, 0103 UTC »

This is an oddity on shortwave that I don't think I have seen before.  If it is common then somehow or another I have missed it.

About 0420 UTC, 03 April, 2020, I noticed what appeared to be a DSB transmission on 9024 kHz.  DSB is not a commonly used mode these days, so I looked a bit closer.

The signal did appear to be DSB, it also appeared to be a repeating audio loop.  About every 21.6 seconds (start to start) the loop repeated, with about 1.6 seconds pause between audio segments.  The audio was not understandable, either it was distorted, processed in some way, or encrypted.  Longer observation showed that every 11th repeated segment included a longer pause, about 3.1 seconds.  This made a repeating cycle of 11 segments about every 239.6 seconds.

Every segment transmitted appeared identical.  Just the same 21.6 second segment (time includes the audio pause) over and over, with every 11th including an increased length pause.

I have uploaded a video of this signal to my YouTube channel.  If you watch the video I include spectrograms of the audio loops, and visual comparisons of multiple examples.  I also demodulate the signal using multiple modes, USB, LSB, AM, and NFM, to show the sound in each mode.  And the last minute or so of the video is the signal demodulated with LSB in the left audio channel and USB in the right audio channel, for comparison.

Video here:
https://www.youtube.com/watch?v=axqgrSzFzG8

T!

248

HF Mystery Signals / Re: Data transmission 4.997 to 5.005 MHz

« on: April 04, 2020, 0102 UTC »

Bet it's 4985 Davidsonville, MD S4481 fsk with spurs.

Unfortunately it probably is not, I compared the two signals and the 5000 USB signal was unique data to any S4481 FSK I could find for comparison.  I checked them all from 2000 kHz to 14000 kHz (propagation left nothing above that for me to check).

I agree, it looks like S4481 FSK, and my first thought was spurs, but I could not find a matching transmission anyplace.

T!

249

HF Mystery Signals / Re: Data transmission 4.997 to 5.005 MHz

« on: April 02, 2020, 1319 UTC »

I did not get a chance to look at this signal closely, however, at first glance it was 850 Hz shift FSK.  It appeared to have only two tones of actual data, however 5 or 6 tones were seen, making it very wide.  Each of the tones appeared to be a duplicate of one or the other of the two tones with unique data.

Total guess here, but it looked like a distorted STANAG 4481 FSK signal.  I would guess a spur or broken transmitter.

Unfortunately, I did not make any recordings of the signal, literally every receiver and PC here at the desk was tied up making other recordings at the time.

T!

250

Spy Numbers / Re: South Korean numbers station V24, March 21, 2020, 5150 kHz, 1400 UTC

« on: March 26, 2020, 1718 UTC »

Sure, I just have to figure out how to do that   Never really taken the time to learn anything about YT, I just upload vids and let them run.  YT is always telling me I need to monetize my vids, but I hate commercials so I can't see that happening.

T!

251

Spy Numbers / Re: V06 09:36z null format

« on: March 25, 2020, 1434 UTC »

TiNG,  I don't know where kalvados recording was made, but the signal was also heard on the Twente WebSDR, but was pretty weak there.

V06, while "inactive" has been heard a few times over the years, not sure if those are errors or testing.

T!

252

Spy Numbers / South Korean numbers station V24, March 21, 2020, 5150 kHz, 1400 UTC

« on: March 23, 2020, 0127 UTC »

The South Korean numbers station V24 has a fairly regular schedule.  However, it does change habits over time, adding and subtracting time slots periodically.  This month V24 has been more active than in many months past.  In fact, this month they reactivated a frequency and time slot that they had not used since May 2018.  So far this month they have hit every scheduled time slot except for the 1600 UTC 5900 kHz slots, which are traditionally less reliable.  It has been over a year since the last time the station was this active.

March 18 at 1400 UTC V24 was heard on 5150 kHz.  It used the same intro music and callup that was last heard on that frequency in May of 2018.  So for whatever reason they stopped using it (this frequency and time) for a while, and have now started again.


My recording of March 21 is better quality than the first recording I made on March 18th, so I have uploaded the later date to my YouTube channel.  The transmission was the same for March 18 and 21, and will be the same in two days for March 25.  It is normal for this station to send identical messages three times a month.

https://www.youtube.com/watch?v=D4NeBnIsvus


T!

253

Utility / Re: Bangkok Meteorogical Radio 6765,1 USB 0000 UTC 29 Jan 2019

« on: March 23, 2020, 0109 UTC »

I threw a video of this station up on my YouTube channel.
https://www.youtube.com/watch?v=xhhmsM2fRrY

T!

254

North American Shortwave Pirate / Re: WDDR 6950 USB 0319 UTC 22 MAR 2020

« on: March 22, 2020, 0458 UTC »

WDDR signed off 0457 UTC, thanks for the show DDR!

T!

255

North American Shortwave Pirate / Re: UNID 6955 USB 0438 UTC 22 March 2020

« on: March 22, 2020, 0441 UTC »

S7 or S8 here in the Mojave Desert of California.  Either off now after the one song, or a very long pause between songs.

(edit 0449z)  Probably the same station back up at 0449z and off at 0455z

T!