[aprssig] KPC3 Fix for Delayd Packets

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Aug 13 22:35:26 CDT 2017


Specifically the suggested serial cable fix:

> Matt Ackerman 
> <https://www.blogger.com/profile/07288273364619867465>said...
>
>     I was working with Kantronics support on this issue and I seem to
>     have solved it by shorting the RTS and CTS pins together within my
>     serial cable. (PINS 4/5 on DB25 and PINS 7/8 on DB9) I simply ran
>     a jumper between the two. This appears to be an issue with how the
>     APRS software and/or the AX.25 stack controls the RTS pin and
>     shorting the RTS and CTS together prevents the software from
>     holding the RTS pin low. If the RTS pin is at low voltage the
>     KPC3+ will start buffering and does not get caught back up. I have
>     been running mine for several weeks without showing this behavior
>     again. Before I made the change it would happen after about 12 hours.
>
>     July 16, 2012 at 8:57 PM
>     <http://blog.aprs.fi/2011/03/kantronics-kpc3-considered-harmful.html?showComment=1342461464554#c7869470599134569351> 

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 8/13/2017 12:45 PM, Max Harper 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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