PSK125

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Principle of the phase shift in BPSK and QPSK modulation

PSK125 ( Phase Shift Keying , 125 Baud ) is a data transmission protocol for radio links.

The protocol is mainly used in amateur radio . Compared to the PSK31 operating mode , it has four times the baud rate , but also requires four times the bandwidth. Like PSK31, PSK125 can be operated either as binary phase shift keying ( BPSK ) with two or as quadrature phase shift keying ( QPSK ) with four phase positions , which doubles the channel capacity if the signal-to-noise ratio is sufficient .

With QPSK, the sideband must match at the transmitter and receiver, with BPSK not.

literature

  • Steve Ford: HF Digital Handbook. ARRL, Newington 2007.