But none of them work at the 2.4GHz of his EXISTING transmitters.
There is also no elevation information, which he also wants.

In principle he could use doppler with 4 non-coplanar antennas
(pyramid) if they were scanned sufficiently quickly for the data
bursts he is getting. TDOA has the advantage of getting a bearing
within a couple of carrier cycles. Doppler requires a full scan
of each sensing plane and his packetized transmissions may not
be on long enough to resolve to the accuracy he wishes.

I suppose there might be suitable PIN diodes which could give
the smooth gain transistion needed from antenna to antenna.

Robert

"Michael J. Pawlowsky" wrote:
>
> They sell them also at boating supply stores. Or look online at West
> Marine or sailnet.com.
>
> Rafael Fraga said:
> > snip
> >> I once looked round the control tower of my local airport, and they
> >> had a device which recieved the local comms channel, and had a crt
> >> which
> > "pointed"
> >> in the direction of the incomming signal so the controllers could see
> > where
> >> the aircraft was who was talking to them. It had an array of 4 dipoles
> >> on the roof of the control tower. Also look up "RF direction finding"
> >>
> >> Cheers.... Mike.

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