[aprssig] 9600 APRS
curt.we7u at gmail.com
Mon Feb 28 14:08:22 EST 2011
On Mon, 28 Feb 2011, Curt, WE7U wrote:
> On Sun, 27 Feb 2011, ml41782 wrote:
>> 9600 on VHF ? I have never really seen this work on even on packet
>> I have seen 2400 & 4800 on VHF but a true 9600 no because of bandwidth
> There's no problem running 9600 baud on 2 meters, 220 MHz, or UHF in the U.S.
> I've personally run 9600 baud on 2m. We used to have a full-duplex 2m
> repeater for 9600 baud in western WA.
To be clear, the G3RUH 9600 baud modem (The protocol we use for 9600 VHF/UHF) uses 4800 Hz modulation plus 2 symbols per transition to get 9600 baud throughput, phase-shift keying. This is the modulation that sounds like slightly-reduced white noise if you have your squelch open listening to it. If you don't have your squelch open, it doesn't open it.
Curt, WE7U. <http://www.eskimo.com/~archer>
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