[ao16aprs] Re: PK232 PSK Transmit

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

The TNC-2 clone I am using implements a J-K Flip-Flop with
the J-K inputs tied together on the output of that SIO chip to
apparently sync data.

Tim - N8DEU


-----Original Message-----
From: Bob Bruninga <bruninga@nadn.navy.mil>
To: TAPR AO-16 APRS Special Interest Group <ao16aprs@lists.tapr.org>
Date: Friday, September 03, 1999 10:22 AM
Subject: [ao16aprs] Re: PK232 PSK Transmit


>Concerning the Manchester mod, thats why I always specify a true TAPR-2
>clone.  In the PacComm Tiny-2, there is a D flip-flop that appears to be
>synchronizing the data to the 1200 HZ clock already,..U13B and there is
>even a spare XOR gate U12A (Or at least I cant find it anywhere on
>the schematic)...
>
>ONCE I get my real DSP-12 UPLINK fully reliable and quantified, then I
>will get around to making the mod and doing some testing.  But for now, I
>am concentrating on the overall systems analysis to determine if these
>satellites are going to be great for ARPS as I think...
>
>P.S.  Just saw 15 packets from KB2WQM on the last pass.  Way to go Jeff!
>
>bob
>
> On Fri, 3 Sep
>1999, 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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>>
>>
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>
>APRSdos REPLY/COMMENT:
>
>Reply mail addr:   wb4apr@amsat.org
>US mail address:   115 old Farm Ct, Glen Burnie, MD 21060
>See DAYTON97 HISTORY:    http://web.usna.navy.mil/~bruninga/dayton.html
>See Maryland APRS LIVE:  http://web.usna.navy.mil/~bruninga/aprs.html
>See GPS on ANY radio:    http://www.tapr.org/tapr/html/mic-e.html
>
>
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