[aprssig] simple digipeater

Curt, WE7U archer at eskimo.com
Thu Aug 19 10:17:31 EDT 2004

On Thu, 19 Aug 2004, James Jefferson Jarvis wrote:

> On Wednesday 18 August 2004 19:42, scott at opentrac.org wrote:
> > For the other, near-term project, if anyone's got a good example of some
> > code for handling carrier detect and clock extraction from a synchronous
> > modem IC (XR2211 in this case, MX614 code would probably be applicable),
> > let me know.  I've already got working prototype code, but if someone else
> > has more robust, proven code to do this, there's no point in re-inventing
> > the wheel.
> http://jamesj.jarviscomputer.com/deskmedia/packet/pic/
> Above links to DCD code based upon the N7CL state machine.

I created a state machine in Altera chips several years back for a
9600 baud modem.  It was fairly simple but gave me clock and carrier
detect.  It was either 8 or 16 states, can't recall now.  I could
describe it further if need be, but finding currently working
examples like the above might get you there quicker.

Curt, WE7U			         http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
"Windows:  Microsoft's tax on computer illiterates." -- WE7U
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