On 25/11/2010 05:34, Vitaliy wrote:
> William "Chops" Westfield wrote:
>> But that doesn't mean you couldn't have a 9600bps FSK modem over a
>> link with inherently higher bandwidth than a phone line (say, a radio
>> link.)
>>
>> Was the original poster looking for a 9600bps FSK modem, or a 9600bps
>> phone-line modem?
> Not a phone-line modem. The channel bandwidth is about 20 kHz.
>
> Given the number of responses and not a single "hit", I shall assume that=
 a
> 9600 baud pure-FSK modem IC does not exist. :)
>
> Vitaliy
>
Yes, I'd assume QPSK at very least, no FSK.

summary background info I used for a talk & demo of packet Radio about 6=20
years ago
http://www.wattystuff.net/amateur/packet/index.html
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.