Interesting. I am - well, I used to be a radio amateur (GW0VSC) but haven't
touched the key for a very long time I'm afriad! I'm not even familiar with
the APRS system - but I'll certainly be learning about it. Many thanks for
the links. There have probably been a lot of new developments in the field
of AR that I'm not even familar with.

If my amateur license would permit me to operate such an unattended
transmitter for tracking use then that would be something to look into -
though I'm quite certain that there are great restrictions on operating such
a 'station' in the UK.

I did originally wonder if I could use a cheap mobile phone or something
attached to a modem of some kind to transmit GSM data. I know zilch about
GSM modems so it's time to do some searches on Google...

Many thanks for the advice all.

Trev


> -----Original Message-----
> From: Michael Pettersson [SMTP:michael.pettersson@CPACSYSTEMS.SE]
> Sent: 11 February 2002 10:15
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: tracking system. was: Car burglar alarm, was Re:
> EE]: C ar MP3 player. (oh no, again!!!)
>
> > Sorry if this is something that's been talked about before (I'm
> relatively
> > new to the list) but has anyone here actually attempted some sort of DIY
> car
> > tracking system? I've pondered a few ways of doing this, such as using a
> > simple direction-finding method using a transmitter, to implementing a
> > system whereby a coordinates from a GPS receiver are transmitted over a
> > radio system of some sort. However, I guess that in practice it would be
> > pointless saving money by making one and not just buying a commercial
> one -
> > an approved tracker will save me more money on car insurance I
> suppose...
>
> Sounds like something that I'm using in my car.
> I'm a radio amateur and we have something that calls APRS,
> automatic position reporting system.
>
> There is a very small hardware that uses the 16f84 on www.byonics.com.
> This hardware takes the gps position in nmea and transmits this with the
> help of a radio.
> More about aprs one could find at www.aprs.net
> To see where different radio amateurs is, www.findu.com.
>
> The problem with sending the position via radio is the need of a receiver
> that hears
> the transmitter. A better way might be a gsm module that can send a sms
> with
> your position.
>
> /regards
>
> Michael Pettersson
> SM6XOG
>
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