GPS to APRS

This is a detailed description of a system to interface a GPS to an amateur radio, in this case, a Kenwood
TM-D700A, for reporting into the APRS amateur radio system on the internet.

Not only do the following web pages describe an electronic system design, but, it is also an exercise in
designing web pages that will clearly illustrate and explain this GPS-to-APRS project.

The "GPS to APRS" is actually comprised of 4 sub systems.

GPS engine with active antenna.
Dedicated computer (Microprocessor).
Output interface.
Amateur radio transceiver.

The 2nd sub system is not absolutely necessary. The Kenwood TM-D700A has its own decoding circuitry
and therefore is capable of using the output of a GPS. However, other information is output from a GPS, i.
e., speed, time signal, of which can be fed to and analyzed by the computer and routed to a stand alone
display for useful ancillary information.

On the GPS side of the system I decided to use a Garmin 15H GPS engine. The Garmin 15H is a WAAS
Enabled, 12 parallel channel GPS receiver which continuously tracks and uses up to 12 satellites (up to 11
with PPS active) to compute and update a position.

Notice - For those persons using the information herein - A WORD OF CAUTION!!! The
Garmin GPS 15H as received from Garmin requires software running on a PC to program
certain parameters. The software is available for download from http://www.garmin.com