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Re: Subject: [Discuss-gnuradio] APCO 25

From: Akshay Mishra
Subject: Re: Subject: [Discuss-gnuradio] APCO 25
Date: Mon, 20 Jan 2003 21:22:14 +0530
User-agent: Mutt/1.2.5i


Sorry if this is a repeat question.
I am a member of this group but did not have a ADC/DAC card as yet.

Can somebody suggest me a good card. Also it has to available in India. If I
have to import it I'll have to pay a 100% duty on it. :-(.

Akshay Mishra.

On Mon, Jan 20, 2003 at 11:32:23AM +0000, Ian Wraith wrote:
|      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.
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