POCSAG transmitter and APRS iGate QRV

Just an update as of January 10th. 2015.

As of January 2015 the POCSAG paging transmitter in its test environment is QRV at 439.9875 MHz. The range is now approximately 5km in the area around JO21QK. The POCSAG transmitter is not always QRV. During the weekend between 7:00 and 1:00 UTC and during business days between 15:00 and 1:00 UTC the system is on.

When the POCSAG transceiver is receiving it’s acting as an RX only iGate on 1200bd APRS on 430.5125 MHz.

The POCSAG paging transmitter is an FT7800 in combination with a Kantronics KPC9612 modem. The modem has been connected to the 9600 bd packet port of the transceiver. Firmware 8.2 of the modem supports the POCSAG protocol. A Python script running on a Raspberry Pi drives the modem. The messages sent are taken from my DX alert propagation system and delivers warnings for E-skip / aurora propagation on the VHF bands.

The APRS iGate relies on APRX running on the same Raspberry PPi. Therefore another modem has been connected to the 1200bd port of the FT7800 transceiver, which has been programmed on split frequencies.

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