[ao16aprs] Re: PK232 PSK Transmit

[Cliff Buttschardt <cbuttsch@slonet.org>]

Hi all.  Has the PK232 ever been sucessfully converted to PSK?  Seems
there were a few traps found here in these messages that would be well
to avoid!!
Cliff K7RR

Tim Cunningham wrote:
> 
> 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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