[aprssig] KPC3 Fix for Delayd Packets

John Gorkos jgorkos at gmail.com
Tue Aug 15 14:21:40 CDT 2017

I'm 90% certain the problem is actually an error in the firmware.
Kantronics would never admit it, and (obviously) refuses to release
their firmware so someone can fix it, but I believe it revolves around a
circular buffer in memory where the pointer would fall one packet
behind. I solved this by running a scheduled job that would periodically
(every 6 hours or so) it would take the TNC out of KISS mode and put it
right back in.
Seemed to do the trick for me.

John Gorkos

On 8/15/17 10:13 AM, Randy Love wrote:
> I remember the exchange, but can't find them either.
> There were two possible solutions, or combination of the two, that fixed it.
> One was tying the DTS RTS lines together.
> The other was disabling all flow control in the TNC settings.
> There's much less headache from this if you use something other than a
> KPC3+ in kiss mode.
> Randy
> WF5X
> On Tue, Aug 15, 2017 at 12:28 PM, John D. Hays <john at hays.org
> <mailto:john at hays.org>> wrote:
>     Doing a quick search, I cannot find a fix -- there was a reference
>     to it being a buffer issue.  It seems that most people just move on
>     to something that works.
>     On Sun, Aug 13, 2017 at 9:45 AM, Max Harper <kg4pid at yahoo.com
>     <mailto:kg4pid at yahoo.com>> wrote:
>         Anyone here remember a post or a link to a webpage about fixng
>         the KPC3 delayed packet problem when in kiss mode? It may not
>         have been on this list. I have searched using Google and Yahoo
>         and can't find what I'm looking for. The fix talked about the
>         handshaking lines in the serial cable as well as a setting in
>         the KPC3 and claimed it would fix the delayeing problem.
>         Thanks
>         Max KG4PID
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>     -- 
>     ------------------------------------------------------------------------
>     John D. Hays
>     Edmonds, WA
>     K7VE
>       <http://k7ve.org/blog> <http://twitter.com/#!/john_hays>
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