Here's a very small PIC-controlled foxhunt transmitter called
"Microhunt". The circuit can be downloaded off this page too. Good
luck finding the ICS525 oscillator though.

http://www.silcom.com/~pelican2/PicoDopp/MH_MORE.html#MF

Cheers,
Zik

On 30/06/06, Luis Moreira <Luis.Moreira@jet.uk> wrote:
> Hi Guys,
> A few years back I found a few web sites about this competitions in the
> US where you go and track a radio signal, like "radio hunting", I can
> not remember the proper name for it.
> I am interested in info about the transmitter and receiver for these
> systems.
> I am looking for some kind of system where I would have a beacon and a
> detector that would be able to detect strength of signal. I do not need
> that much range, 5 meters would be plenty although more would be ok. The
> aim is to get a small detector that will give an analogue output
> proportional to the strength of the signal being transmitted but also be
> directional i.e. if moved around will detect where the stronger signal
> is coming from.
> The TX also needs to be small.
> Thanks,
> Best regards
>                 Luis
>
>
>
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist