6 November 2016

BPSK 2400Bd 3Khz, QPSK 4800Bd 6 KHz (Maritime Band)

These are unidentified signals heard by me and my friend KarapuZ in the Maritime Band segments, mainly 8 and 12 MHz, during daylight. Transmissions are a mix of 3 KHz and 6 KHz wide channels and use PSK modulation, symbols rate is dependent on the bandwidth:
3 KHz BW: 2400 symbols/sec, BPSK modulation (fig. 1)
6 KHz BW: 4800 symbols/sec, BPSK and QPSK modulation (figs. 2, 3)

fig. 1
fig. 2
fig. 3

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