MFA Moscow - X06 15920 USB 0510 UTC 28 JUL 2023

[~SIGINT~]

MFA Moscow - X06 15920.0 kHz USB 05:10 UTC 28 JUL 2023

05:10 UTC - MFA Moscow - X06 Russian Diplomatic Service with 6 repeating proprietary selective calling system tones; transmitting in USB with AM carrier (AME). Good readable;
05:22 UTC - Loud and clear on the University of Twente Wide-band WebSDR;
05:23 UTC - Transmission ended.

Tone Sequence (Hz): 815, 845, 875, 910, 950, 990 (test sequence)

MFA Moscow - X06
https://priyom.org/diplomatic-stations/russia/x06

RSPduo | Barker & Williamson T2FD antenna

[tiNG]

Hi.

Seems to be Russian MFA Moskau with its "Mazielka" X06.

Selcall to embassy for following transmissions in either Serdolik, Perelivt or OFDM-45 on another frequency.

Hope this helps.

[~SIGINT~]

Hello Thomas,

That signal is precisely what I heard. I had looked on Priyom for the frequency and had come up empty. I guess I was looking in the wrong place. Interesting proprietary selective calling system.

I played the audio recording back through Spectrum Lab for analysis and the tone sequence matches.
Tone Sequence (Hz): 815, 845, 875, 910, 950, 990 (test sequence)

MFA Moscow - X06
https://priyom.org/diplomatic-stations/russia/x06

Original post updated and thank you for the ID.