19 May 2015

RUS-ARQ 100Bd/2000

FSK  ARQ system 100 Baud and 2000 Hz shift heard this morning (19 May) on 12129.5 cf starting from 0640, s/off at 0650. It sounds like an ARQ system, possibly from Russian Governative (then the nickname RUS-ARQ). As far as I know, the signal is sent by an outstation to its main 'home' station, that in its turn operates in CIS 3x100 (VFT 3 x FSK-2 channels) on three correspondents. All these stations (main and oustations) operate in synchronous mode, usually not far apart in frequency.

The recordered signal can be downloaded from here:

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