Check out
http://www.telelink.com.au/
http://www.radiomodules.net/

As advertised on the back page of Silicon Chip Magazine.

We use selcom radio's at work - will need to find the address - Christchurch
I think.

ps I see u are in NZ

*************************************************

Roy Hopkins

rdhopkins@ihug.co.nz

*************************************************
> I like the idea of building a UHF transponder/beacon set. The unit sends
> a unique pulse train then listens for a reply. The beacon receives and
> decodes the pulse train, waits a preset time, then replys. The unit
> receives the reply and calculates distance from the signal's time of
> flight. Jittering the PRF and range gating would improve signal to
> noise.
>
> Max distance is around 1500m so a 2km range would be desireable. I'd
> like transmit status information in the pulse. Basically what I'm after
> is a low power UHF (~400MHz) version of the air traffic secondary
> surveilance radar.
>



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