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Author Topic: 1200/9600 bps connection  (Read 6588 times)
NN1I
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« on: December 24, 2001, 12:42:57 PM »

Radio-to-TNC wiring diagram for my radio is different for 1200 and 9600. In the first case I must use audio from the speaker, but in the second case there is a special 9600 audio output. Why is this different?

I want to make a PC soundcard adapter, and I like the idea of using 9600 output, because it is the same RJ-11 connector for the mic. What is so special about 9600 output on my radio? Can I use this 9600 output for ALL digital modes?

73 Igor NN1I
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W7DJM
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« Reply #1 on: December 24, 2001, 04:41:06 PM »

I no just about nothing about packet, but I'm sure that this is true.

The 9600 baud needs better audio response, which is available by tapping into the "discriminator output"  usually not provided as an output on the everydayradio.

I haven't really followed the packet thing, but I occasionally see "packet ready" or "9600 baud ready" radios advertised.   I assume that tx/rx switching time could also be an issue.

If you fiddle around with scanning a swl, this is also true of stuff like paging decoder software available on the internet, for soundcards.

Once the audio leaves the discriminator, and goes through the usual audio amp stages in the radio, the response curve is tailored, filtered, altered, and you lose some of the response.   This is where, for example, that PL tones (ctcss) gets filtered out so you can't normally hear them.
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K0HZI
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« Reply #2 on: December 25, 2001, 08:45:35 AM »

Sound card PACKET program, AGWPE: http://www.qsl.net/soundcardpacket/index.html
You can set up for 1200 and 9600 bps.
Also check TAPR: http://www.tapr.org/tapr/index.html it has a lot of info for PACKET.

Jerry
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