Motorola PURC Tone Remote Control
Paging Modes: AFSK Paging Link - POCSAG - Glenayre Paging Link - PSK paging link - FLEX - ReFLEX - Golay Paging (GSC) - ERMES
Since the original POCSAG waveform is a pulse train, it cannot be used for PSKPhase-Shift Keying. Only AFSKAudio Frequency-Shift Keying. It has to be re-shaped to match an angled waveform in order to meet PSKPhase-Shift Keying specs.
The reason this signal is also rare in the world is because of the lack of infrastructure and modem design needed. This may be one of the only examples left.
example IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis.:
Spot is reserved for another time...
This example defined the symbol length of 8PSK8-Phase Phase-Shift Keying (3 bits per symbol), popular among hams. It has a center carrier of 1800 on each waveform. Varying waveforms can also exist, making it sound much like a V.27 modem. << one of them.
^^ A poorer example thats supposed to be utilizing binary PSKPhase-Shift Keying.