Order Tray | Contact Us | Home | SIG Lists

[aprssig] Help with Interfacing a GPS to Kantronics KPC-3

EXT-Maetta, John john.maetta at boeing.com
Wed Jan 3 21:38:23 UTC 2007

Hi Earl,

Yep....I will worry about frequency choice and packet length, for this
new project, when the basics start working.

Ok, I can successfully see the Xmit LED illuminate when in CONV mode.
Text typed is transmitted, so the TNC is working. 

This is very frustating.  Are you using the KPC-3 with a GPS receiver?


-----Original Message-----
From: Earl Needham [mailto:needhame1 at plateautel.net] 
Sent: Wednesday, January 03, 2007 1:31 PM
To: TAPR APRS Mailing List
Subject: RE: [aprssig] Help with Interfacing a GPS to Kantronics KPC-3 

At 02:23 PM 1/3/2007, EXT-Maetta, John wrote:
>I have connected the TNC the laptop and sent the captured GPS strings 
>to the TNC.  Still no Xmit from the TNC.  I use the same cable to 
>configure the TNC so I know data is getting to and from the TNC.
>I am using Hyperterminal to setup the TNC and to also transmit the GPS 
>text file to the TNC. The KPC-3 does not seem to parse or recognize the

>$GPGGA or $GPRMC string headers, ethier from the GPS or the laptop.
>I have tried using a null modem solution from the GPS to the TNC, but 
>no luck.  Data does leave the GPS and I connect the GPS to the TNC via 
>pin 2(Tx in) and 7 (Gnd).
>My KPC-3 is version KPC3P-E6ED7265-8.2. Is my F/W capable of performing

>this GPS parse?

         I think it is, and one good thing about the APRSSIG is that if
somebody makes an error there are any number of friendly people anxious
to correct it, hi hi!

         Seriously, at this point, I think I'd connect the TNC to the
laptop, take the TNC out of GPS mode, and see if I could manually
command it to transmit.

         7 3

Clovis, New Mexico DM84jk
"Just say NO to DHL" 

aprssig mailing list
aprssig at lists.tapr.org

More information about the aprssig mailing list