Dear Claudio,

I used a 10GHz "gunnplexer" made my M/A Com. I think M/A Com has
discontinued them and another company has now started to make them. In any
event, you can find them here:

http://shfmicro.com/gunn.htm
(go half way down the page to the 10GHz one)

I see that they have now gone up to US $86, though, I think they were about
$70 when I bought one.

Gunnplexers are a combination of a Gunn-diode oscillator with a schottky
diode mixer. Mine also includes a varactor diode for tuning the radar
frequency (but I don't bother to use it, just tie it to a fixed voltage).
The Gunn diode (which produces about 10mW in this one) not only produces
the output power but also excites the mixer. Any incoming signals are mixed
with the carrier in the mixer, and the output is low-pass filtered to the
audio range and then amplified by (IIRC, I'd have to take it apart again to
check) half of an LMC6482 dual op-amp and then an LM386 to drive the
headphones.

I also bought a metal-plated plastic horn antenna from the same company
(shfmicro, address given above) which is meant to mount right onto the
waveguide flange on the output of the gunnplexer.

Sean

At 11:52 AM 2/23/02 +0100, you wrote:
>Small question: what radar sensors and transmitter are inside that box?
>We had a small radar experiment also, but the sensor we used was
>discontinued...
>
>-----Original Message-----
>From: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Sean H. Breheny
>Sent: zaterdag 23 februari 2002 6:19
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [EE]: 10GHz and fluorescent light
>
>
>Hi all,
>
>A while back I bought a 10GHz gunnplexer (combination 10GHz low-power
>transmitter and simple homodyne receiver) and attached a sensitive audio
>amplifier in an attempt to make a simple doppler radar.
>
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>http://www.piclist.com hint: The PICList is archived three different
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