APRS must work everywhere to be a true resource to the mobile ham radio operator. In North America, 144.39 MHz is dedicated throughout the continent. In Europe, use 144.80 and in Australia use 145.175 MHz..
AVRT5 APRS Tracker VHF with GPS/Bluetooth/
(I came across this device last year online, took the chance and purchased one. After reading the forums and seeing several others having problems with the USB interface, I noted the following:
- users *MUST MUST first upload the firmware to the device before it will boot. This is a case of RTFM, and requires the USB cable (above) to work correctly.
Once you overcome these initial hurdles, it does work great! Simple, accurate, and extremely useful.
I have used this running 1W and a 5/8w on the roof of the car, with pretty decent results around South Texas. I added a 25w 2m amp to it I purchased used at a hamfest, and have experimented with both a 1/4w and 5/8w magmount with excellent results with daily use and for public service events. This unit has an internal battery that will run for several hours, but using a Mini-USB cable and 12v adapter it will run indefinitely. There are a few people on the forums who have replaced the expired battery with a set of electrolytic capacitors with good results.
Also, for high altitude balloon launches, there is a modification available for altitude limitations.)
Must read book about ARPA: