[aprssig] Suggestions for modem designs?

Brian Riley brianbr at mac.com
Fri Oct 13 10:26:44 CDT 2006

  Rich, why not do it with one of John Hansen's TNC-X KISS TNC's  
(they are not very large and rather decently priced), rather than  
getting all bogged down writing and debugging HDLC code, just take  
FullDup.spin and adapt it to handle KISS ... IMHO, much lower "gray- 
hair quotient" project.

... and, of course, gotta ask, are you doing it on the PRC board? If  
you are and you want some more, contact me off list and I will make  
you a rock bottom deal as my contribution to the project.

cheers ... 73 de brian  riley,  n1bq , underhill center, vermont
   <http://web.mac.com/brianbr/>  Tech Blog
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On Oct 13, 2006, at 8:45 AM, Rich Mulvey wrote:

> Hi All:
>   I'm in the midst of working on an embedded APRS tool using the  
> Parallax Propeller chip.  ( http://www.parallax.com/propeller/ 
> index.asp ).  Right now, I'm working on having it decode APRS  
> packets over a serial link, as if from a TNC.
>   The next step is to actually have it decode APRS packets off the  
> air.  Therefore, I'm looking for a good design for a 1200bps  
> modem.  There are a number of MX614-based ones out there, for  
> example, some of which are pretty minimal, others that have more  
> front-end filtering, etc.
>   Can anyone suggest particualr implementations that work well?   
> They don't have to be 614 based - they just seem to be the most  
> common ones I've run across.  I want something that handles both TX  
> and RX, as well.

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