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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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