1200 baud regen

Bill V WA7NWP wa7nwp at gmail.com
Thu Oct 8 09:46:47 PDT 2009


thanks Jeff,

This is all good info and please keep it coming.   I'm feeling the
need for a significant "1200 baud regen" project to explore the
various options and provide some solutions...

Hmmm.   If it's software, why limit it to 1200.  Should be easy to
also handle alternate speeds like 2400 and 4800...

Bill

On Thu, Oct 8, 2009 at 7:46 AM, Jeff King <king.robert.j at gmail.com> wrote:
> As I mentioned, Jack Taylor did the entire 1200 bit regen with a 7400 logic
> chip. He didn't even both to reclock the bits, it basically used a dumb
> 2206/2211 exar modem chip set, cross connected it and detected DCD logic to
> key the PTT with a bit of hang time. So dispite the fact it was hanging on a
> TNC2 disconnect header, no CPU was involved.
>
> I don't have the schematic handy, but given 5 minutes I'm sure it could be
> recreated. Of course, these days, a PIC could do a much better job, much
> cheaper, then a 7400. I suspect with the CCS compilier, it would be under a
> 30 minute programming job.


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