It should take just a few minutes to complete this crude GPS tracker. It is made out of FRS or PMR446 two-way radios and a Garmin GPS receiver. You could probably use any other GPS receiver and the range of this tracker is around 2-3km - depending on the two-way radios range.
What's interesting to me is that this configuration actually does work: RS232 output from Garmin is connected to microphone input of one radio with only two wires. At the other (receiver) side, instead of a speaker, a wire with a COM port connector is soldered and connected to PC with Google Earth and Earth Bridge installed.
It is a very simple hack that works but I would really like to see some opto-isolators here.
- From trax on 27-08-2010 at 08:04:48
I agree, some FSK modulation would be perfect for this (ham packet radio). That means it would
need FSK demodulator at the receiving end and that would be the real deal.
- From Pinko Pallino on 26-08-2010 at 20:02:17
Opto isolation is not needed, both are running on batteries, and if you have a common ground
that is perfectly O.K.
However the bit rate of most GPSs is 4800 bit/s so the signal sent over radio in this way is
not likely to work, or be a particular good design/robust/functional. Bandwith of your radio
is at most 11.5 kHz.
A small uC that acts as a modem however would make this a real system.
- From trax on 28-02-2009 at 03:46:54
Nemoj da mislis dzabe :-)
- From cih on 27-02-2009 at 10:40:41
U ovom sklopu ima samo jedan smer sto znaci da ne moze da kontrolise gps uredjaj. Ja mislim da
za svaki gps uredjaj trba i tx rx
- From pepi on 26-02-2009 at 11:16:43
Zasto ne bi radilo?
- From cih on 26-02-2009 at 07:57:27
Da li je neko probao ovo i dali je moguce da to radi??