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

EXT-Maetta, John john.maetta at boeing.com
Wed Jan 3 21:23:41 UTC 2007

Hello Earl,

Thanks for your reply.

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?




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

At 01:38 PM 1/3/2007, EXT-Maetta, John wrote:
>I can connect my GPS to my laptop serial port and receive NEMA183 data.

>I can view the $GPGGA and $GPRMC strings, along with several other 
>$GPxxx strings.
>These strings are updated every second, therefore I know my GPS is 
>transmitting data.

         I would suggest you connect the TNC to a computer and see if
you can read the strings from it.  If not, then you know the data isn't
getting to the TNC and there is something else going on.  If the TNC
doesn't have the strings in it, try putting a null modem between the GPS
and TNC and see if that fixes it.

         7 3

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

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