[ao16aprs] Re: PK232 PSK Transmit

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

I have a simple modification working with the TAPR-2 TNC clone
that I am documenting at the moment.

Since I do not have a schematic for the PK232 I cannot comment
on that model.  If anybody has a schematic for a PK232, please
send it and I will take a look at it.  If you can scan the schematic
and e-mail it, that would be great!


73's,

Tim - N8DEU
Huntsville, Alabama


-----Original Message-----
From: Cliff Buttschardt <cbuttsch@slonet.org>
To: TAPR AO-16 APRS Special Interest Group <ao16aprs@lists.tapr.org>
Date: Monday, September 13, 1999 1:41 AM
Subject: [ao16aprs] Re: PK232 PSK Transmit


>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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