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| Fig. 1 |
Tadiran/ElbitHF modem, probably the HF-6000 model, running in COMSEC mode using FSK 125Bd/300Hz Digital Coded Squelch (DCS) and scrambled voice-comms. The FSK segmentes (the DCS part) sent during the scrambled voice-comms have a speed of 125Bd and 300Hz shift, ie same parameters of the initial F7B (apparently MFSK-4) waveform, and cosists of a 160-bit period bitstream (Figure 2).
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| Fig. 2 - main DCS parameters |
It's worth note that the transmission was sent using LSB (Figure 3).
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| Fig. 3 |
https://disk.yandex.com/d/novPamUmQksXmg
I've caught some (by-passed scrambler) voice on 31 May 2023 and with the help of some guys we found that it was Slovenian language, it's rare to catch Tadiran equipments on LSB so I assume the next tfc spotted in LSB will be SVN MIL? again.
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