TADIRAN HF modem, probably the HF-6000 model, running in COMSEC mode using MFSK-4 125Bd/300Hz and scrambled voice-comms. Transmission heard on 5885.0 KHz/USB at 0755z with a very poor SNR. The sample marked as "A" is the "autocall" waveform: it follows the MFSK/scrambler session and terminates the link.
