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Published on Apr 26, 2010
Tecnomen HiQ 1000 paging transmitter driven using a self-built POCSAG encoder. The POCSAG binary code for the complete burst is generated using the new POCSAG::Encode perl module on a Linux host, transmitted using a KISS-like protocol called PISS to the Arduino Duemilanove 328 board, which then keys the transmitter and drives bits to the transmitter at the selected speed (512 bit/s in this case). The transmitter is a real FSK surplus paging TX, and puts out 200W. We're currently running on 144.975 MHz in Helsinki. The encoder can bundle a number of messages in a single burst, but there's a lot of space for optimisation in the message scheduling.
The software and instructions to build the modem have been released here: