I don't know where this thread went, but... Perhaps I missed it, but try
searching on Gunplexer.

That should get you to the ham sites where such things are talked about and
sources named. Hams use them on 10 GHz and it would be a simple matter to
detect the Doppler freq and do some sort of frequency detect.

Oh hell. here's some of my links:
http://www.g3pho.free-online.co.uk/m...s/wideband.htm
http://www.kwarc.org/10ghz/10GHZ-4.htm


73, Steve, K,9.D;C'I


"RST Engineering" wrote in message
...
Back in the '60s and early '70s I did some work with Impatt and Gunn
diodes,
building a little self-detecting doppler for speed sensing. However, 35
years have passed and my notebooks for that stuff are somewhere in a dusty
archive along with my venerable sliderule.

Is there a cheap source for onesies-twosies of a radar front-end that will
give me doppler audio as a function of a large metal object's speed at a
range of 20 meters or so? I don't need to go into production on this
thing,
just build one. A surplus source would be ideal.

It seems that the little kids on our rural country lane have all become
teenagers at once and are trying to outdo the others in how fast they can
drive daddy's car up and down the lane. We've lost one dog this week and
unless I can put up some sort of a siren that goes off when they exceed
some
agreed upon limit, the carnage will continue.


Regards,


Jim