Bursts copied on USB 16975.0 and 17157.0 KHz, in the 16-17 MHz Marine band segment. The waveform uses BPSK modulation at 4800 Baud and a bandwidth of 6 Khz, the copied bursts have a duration of ~386 and ~505 msecs.
Speed and bandwidth lead to think to MIL 188-110C App.C "WBHF" but this standard povides BPSK/4800Bd waveform only for 9 KHz bandwidth.
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