The follwoing connections are for connecting the Garmin eTrex to the TigerTrak TM-1 encoder, and the TM-1 to the Yaesu/Vertex VX-150 VHF handheld radio. The cable color codes may vary. These cables were purchased from www.packetradio.com.
GPS to Encoder
This connector connects the eTrex to the TM-1. This connector is "backwards", and doesn't require a null-modem adapter to interface to the TM-1. It WILL NOT work for connections of the GPS to a computer, however. For the cables from the Purple Open Project, the data wire is brown and the ground is black.
HT Radio to Encoder
Using the right-angle plug available from www.packetradio.com the following wiring of radio to TigerTrak TM-1 works.
|TM-1 Cable||Mic Cable|
|Yellow||White (TX Data) (3)|
|Green||Red (TX Data) (1)|
|Blue||Black (Ground) (4)|
KPC-3+ to Yaesu/Kenwood 6-pin mini DIN
The diagram assumes the mini din connector sold by www.packetradio.com. Iím not certain if the color scheme is standardized for the 6-pin mini din connector, so double-check the colors with a voltmeter. This connector worked for Yaesu radios with a mini DIN and Kenwood radios.
GPS to KPC3+
A GPS as well as a radio can be connected to the KPC3+. If you constructed your GPS cables as per this document. That is, in such a manner as to not require a null modem adapter. Then wire your female DB-9 according to the diagram above. This will allow you to use your GPS cables on a TigerTrak as well as the KPC3+. Of course, you may want to wire it as per the KPC3+ manual, then use a null modem adapter to use any other cables. It depends upon your needs.