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Legacy TNCs

 

Even if you don't have one of the funky APRS mobile radios, and don't have a TinyTrak kit, you can still send your position from a mobile station using a standard TNC setup. This page details how to use a few common TNC models as mobile trackers.

Most of the later firmware releases for these TNC's support APRS parameters. All you need to do is to connect your GPS to the TNC (refer to the TNC manual) and configure the parameters as shown in the tables below.

Kantronics KPC-3 and KPC-3+

(For KPC-3, connect GPS data to Pin 2, GPS Ground to Pin 7 of TNC DB-25 terminal connector)
(For KPC-3 Plus, connect GPS data to Pin 2, GPS Ground to Pin 6 of TNC DE-9 radio connector)

TNC SETTING KPC-3, KPC-3 Plus TRACKER (up to 8.2, not 8.3)

ABAUD

4800

BEACON

EVERY 10    (10 minutes - 600 seconds if config is in seconds)

BLT

1 EVERY 00:02:00
2 EVERY 00:02:00 START 00:01:00
3 NONE

BT

>(Text), begin with a > so it shows up in the status line of APRS software

CD

SOFTWARE

CMSG

DISC

GPSHEAD

1 $GPGGA
2 $GPRMC  
3 NONE  

HEADERLINE

OFF

UNPROTO

APRS V WIDE1-1,WIDE2-1

LTP

1 GPSMV V WIDE1-1,WIDE2-1 (See SYMBOL notes below)
2 GPSMV V WIDE1-1,WIDE2-1
3 NONE

MYALIAS

NONE

MYCALL

VK2xxx-9

MYREMOTE

(CALLSIGN SUFFIX)R-9 (EG GPSR-9).... up to you

RTEXT

(Secret text known only to the control operator)

INTFACE

GPS

If you have a KPC-3 Plus with 8.3 or 9.0 firmware, input the GPS data to the KPC-3 Plus DE-9 pins 2 and 6 (data and ground, respectively). This frees up the DB-25 port, so if you want to run it as a tracker, you can, and if you want to run APRS mobile with a laptop, just plug in the computer cable and go. No other changes are necessary. Additionally, make these settings in the KPC-3 Plus (8.3 or 9.0 only):

GPSPORT 4800 NORMAL CHECKSUM
INTFACE TERMINAL

Paccomm Tiny-2

Firmware releases after version 3 support APRS and GPS commands.

Refer to your manual for details, however parameters should be set as per the KPC3 example above.

SYMBOLS

*Check the latest SYMBOLS.TXT file to find the XYZ code for the symbol you want to set.

To get the desired symbol, place it in the TO CALL of the LTP line, e.g. LTP 1 GPSxyz via WIDE1-1,WIDE2-1 where "xyz" is derived from the symbols file. Most common symbols:

GPSMV = Car
GPSLV = Van
GPSHT = Running Man
GPSLJ = Jeep
GPSLK = Truck

 

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