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From: | Ian Wraith |
Subject: | Re: Subject: [Discuss-gnuradio] APCO 25 |
Date: | Mon, 20 Jan 2003 11:32:23 +0000 |
Hello If anyone wants to write a gnuradio module for one of the modern digital trunked radio systems then have a look at Tetra or Tetrapol. Both are semi-open i.e the full specs are online (well except for the crypto) but parts of the spec are the IP of various companies. Tetra is a 4 slot TDMA system with an 18K symbol rate and DQPSK modulation so it should be possible to do using a standard 44 KHz soundcard. While Tetrapol is an FDMA system using 9600 baud GMSK modulation. Regards Ian
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