[aprssig] Why do we not use APRS 9600?

DANA MYERS k6jq at comcast.net
Wed Feb 16 17:28:06 EST 2022

>     On 02/16/2022 2:19 PM david vanhorn <kc6ete at gmail.com> wrote:
>     Why is 9600 the magic number?
>     1200 sucks, but 2400 and 4800 suck proportionally less, and are proportionally more difficult.
>     No particular reason to stay in the standard baud rates either. 3200 might be the sweet spot.
By the time you go to the trouble to make anything faster than 1200 baud work -
which means finding the flat audio in/out path to the discriminator/transmitter - you
might as well do 9600, which fits in a standard NBFM channel.

Multi-level modulation schemes are neat, but require good end-to-end linearity
for decent performance. 9600 GMSK probably IS the sweet spot.

Dana  K6JQ
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