UNID 6830 USB 2324 UTC 17 OCT 2023

[Shortwave_Listener]

S9 with the KT4RS KiwiSDR.

2324 UTC-Noise, similar to but not the same as 6945

This can be heard on KiwiSDRs in Europe (strong) and Asia (weak), either a very powerful pirate or some broken utility. Also heard on 5714 USB. Presumably not pirate.

[N2MLP]

2339 UTC
s9 PEAK

STRANGE NOISES??

[myteaquinn]

0000: S9 signal with similar sounding noise as on 6945.
0021: Seems off.
0022: Nope, back.

[JustGreg]

I have it with a good signal, but, audio is very broken up. Maybe music.  Definitely strange.
0005, On my waterfall display this looks like the  6945 signal.

[Charlie_Dont_Surf]

IT'S THE WAR OF THE WORLDS!

Seriously, this is similar, I agree.

Bits of maybe kinda-sorta music.

The "distributed" frequency nature (showing up on multiple frequencies at once) makes me think that someone has a very severe Intermodulation Distortion (IMD) issue.

I'm going to check if 6830 is // 6945. --> Conclusion: They do seem to be sort of doing the same thing.

Off or stopped at 0021 UTC but only briefly.

[Charlie_Dont_Surf]

Presumably not pirate.

Agreed

[Traveling Wave]

0345 UTC - Signal is S9 in WNY on both frequencies (6830/6945). Hearing it on 5714 at an S5.

[shadypyro]

I send a message to the UDXF forum, see what answers I'll get with this oddly signal

[shadypyro]

So I got a answer that it is from Khabarovsk Russia and it has to do with a bad broadcast, so i would say mystery solved

[Ray Lalleu]

- again that strange signal on 6830 on 19 OCT 2023 at 0745,
also on 5715
heard here in Europe (while propagation is open from South USA)

- again on 6830 on 21 OCT 2023 à 0740 UTC (same conditions)

[~SIGINT~]

Hello Ray,

As for 6830 kHz, my copy of Roland Proesch's Frequency Handbook for Radio Monitoring HF this indicates South African Navy with an MHF-50 MODEM (B=54.3 Bd, Ch=32, Ch Spacing=64.5 Hz). Another user is Russia PTT Moscow in CIS ARQ mode, B=100Bd, S=500Hz.

No hits on the 5715 frequency and I have not been able to receive those signals to have a listen to them.

~SIGINT~

[Dr. Amp]

This is back right now on 6831, it sounds like bad SSTV or WEFAX.  It's S9 in central Pennsylvania, so I'm doubting it's from Russia.

[~SIGINT~]

01:11 UTC 28 OCT 2023 - Receiving it as well. I also came across it a few days ago when it was much clearer. It sounds like a broken FAX transmission with an echo in it. Listen to it for a while and you will notice the similarities to the FAX cadence.



~SIGINT~

[Dr. Amp]

Tonight the frequency is presenting a perfectly normal, albeit apparently encrypted, RTTY signal. 

[~SIGINT~]

Nothing my way tonight but I did catch the same signal in the 7 and 5 MHz band way early this morning and unfortunate did not have anything to write down the frequencies with.