AFSK Paging Link

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Paging Modes: AFSKAudio Frequency-Shift Keying Paging Link - POCSAG - Glenayre Paging Link - Motorola PURC Tone Remote Control - FLEX - ReFLEX - Golay Paging (GSC) - ERMES

AFSK Paging Link
AFSK POCSAG pic 1.PNG
Frequencies 72 MHz,850 MHz,928 MHz,76 MHz,450 MHz,460 MHz,470 MHz
Frequency Range 72 MHz - 928 MHz
Mode NFM
Modulation AFSK
ACF
Emission Designator
Bandwidth 9 kHz
Location Worldwide
Short Description A variant of POCSAG/FLEX with audio FSK modulation as both waveforms utilize pulse trains. Typically found as uplinks/downlinks to pager network transmitters.
I/Q Raw Recording Download file
Audio Sample


POCSAG and FLEX are read as pulse trains in FMFrequency Modulation as their spectrum of FSKFrequency-Shift Keying is only 2 carriers switching on and off. With this in mind, additional transmitters can use that pulse train waveform to be re-modulated as AFSKAudio Frequency-Shift Keying modes in an FMFrequency Modulation baseband ranging from Bell-202, Lojack, or any other modes as uplinks or downlinks in the RFRadio Frequency bands.

Audio files:[edit]









I/Q:[edit]

https://drive.google.com/open?id=1weV6dasw3XuFUqomQhKPgW242Hk4Ma5q


Images:[edit]

other examples:[edit]

Some example photos and sounds of some simulated uplinks from audacity and from the dutch/German POCSAG encoder from SoRFmon, LO'd on several different frequencies in HDSDR, which is then FMFrequency Modulation'd outside the soundcard for realistic sounding transmissions:


The result when AFSKAudio Frequency-Shift Keying is mixed in with Flex @6400 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.: