[ao16aprs] Re: PK232 PSK Transmit

["Tim Cunningham" <tim_cunningham@mindspring.com>]

I am working on it as time permits and will release any results when 
it is finalized.  I have one circuit working, but I am trying to minimize 
the parts required.  There are two ways to approach the problem:

1. Minimal parts using existing TNC circuitry.

2. Plug-in board for the modem disconnect header.


Is there anybody else working on this?  

If you see my beacon from the Gulf sometime this weekend, you 
will know that I will have option #1 completed.

I am using a TNC-2 compatible unit.  My first attempt failed with the
simple XOR of the TXC (1200 hz) and TXD.  A quick peek on a 
scope revealed some of the trouble as well as listening to the
output which was the first clue.  Synchronization of the data and clock
is the key before applying the signals to the XOR circuit. Since my
time is extremely limited, I work on this in about 10 minute time slots
each day on the weekend.



73's,

Tim - N8DEU




-----Original Message-----
From: Henry Moseley <hmose@sover.net>
To: TAPR AO-16 APRS Special Interest Group <ao16aprs@lists.tapr.org>
Date: Friday, September 03, 1999 8:09 AM
Subject: [ao16aprs] Re: PK232 PSK Transmit


>Did Pat McGrath ever get the info requested on how to make the $3.00
>modification to the PK232? Has anyone first hand info or comments on the
>specifics of this modification??  Has anyone actually done this??
>
>Thanks, Henry KA1RRT@amsat.org
>
>
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