[ao16aprs] Re: PK232 PSK Transmit

[Bob Bruninga <bruninga@nadn.navy.mil>]

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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