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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 20:38:37 UTC 2007


Greetings to all. 
 
This is my first post to the SIG.
 
I am experiencing problems interfacing my Magellan GPS Tracker to the
Kantronics KPC-3. KPC-3 settings are as follows:
 
GPSHEAD
1 $GPGGA
2 $GPRMC

LTP
1 GPS VIA DIGI
2 GPS VIA DIGI
3 GPS
4 GPS
 
BLT
1 EVERY 00:00:10
2 EVERY 00:00:20
3 EVERY 00:00:00
4 EVERY 00:00:00
 
LTRACK   1 LT1 LT2
 
ABAUD    4800
 
I set INTERFACE to GPS, power off KPC-3, connect GPS to DB-25 connector,
power up GPS and then power up KPC-3.  Using the above configuration,
the KPC-3 should Xmit the $GPGGA GPS string every 10 seconds and the
$GPRMC GPS string every 20 seconds.  
 
The Xmit LED does not illuminate so I assume that the KPC-3 is not
recieving the strings correctly or transmiting.
 
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.
 
The following is captured GPS data from my Magellan Tracker:
$GPGLL,3449.9685,N,12026.9276,W,202153.531,A*23
$GPGGA,202153.53,3449.9685,N,12026.9276,W,1,04,2.0,00032,M,,,,*30
$GPGSA,A,3,01,02,03,04,,,,,,,,,2.0,2.0,2.0*34
$GPGSV,3,1,11,12,87,265,,24,87,254,,05,81,265,,02,61,042,*72
$GPGSV,3,2,11,30,48,312,,10,36,137,,06,24,290,,04,19,046,*73
$GPGSV,3,3,11,09,18,203,,07,12,286,,31,02,327,,,,,*46
$GPGLL,3449.9886,N,12026.9276,W,202156.875,A*26
$GPGGA,202156.88,3449.9886,N,12026.9276,W,1,04,2.0,00032,M,,,,*3E
$GPRMB,A,0.00,R,SIM001,SIM002,3452.5112,N,12026.9276,W,002.5,000.,021.7,
V*00
$GPRMC,202156.88,A,3449.9886,N,12026.9276,W,21.7,000.0,030107,15.,E*75
$GPAPB,A,A,0.0,R,N,,,345.3,M,SIM002,345.3,M,345.3,M*71
$GPGSA,A,3,01,02,03,04,,,,,,,,,2.0,2.0,2.0*34
$GPGSV,3,1,11,12,87,265,,24,87,254,,05,81,265,,02,61,042,*72
$GPGSV,3,2,11,30,48,312,,10,36,137,,06,24,290,,04,19,046,*73
$GPGSV,3,3,11,09,18,203,,07,12,286,,31,02,327,,,,,*46
$GPGLL,3449.9886,N,12026.9276,W,202156.875,A*26
$GPGGA,202156.88,3449.9886,N,12026.9276,W,1,04,2.0,00032,M,,,,*3E
$GPRMB,A,0.00,R,SIM001,SIM002,3452.5112,N,12026.9276,W,002.5,000.,021.7,
V*00
 
I then tried send this text file from the laptop to the KPC-3 while in
GPS mode. Still, no Xmit LED or data from the KPC-3.  The KPC-3 should
be parsing the $GPGGA and $GPRMC strings and transmitting them.  
 
Please review my configuration and offer any suggestions.  
 
Thanks,
 
73
 
John N6VMO
 
 
 
 
 
 
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