Hi Peter,

Actually, I was comparing the signal strength of the echo from the light
with the echo from my PC's power supply fan. I have not compared it to the
signal from a car at the same distance.

Since the discussion here, I was talking to a friend about this and he
suggested that possibly what I am hearing is actually microwave noise
emitted by the light(modulated by 120Hz), not an echo. Since the gunnplexer
needs to be transmitting in order to receive anything (in order for the
mixer diode to work it needs to be excited by the Gunn diode), the only way
I can think to test this would be to put an isolator in the signal path
between the horn antenna and the gunnplexer (so that the Gunn oscillator
can still run, the gunnplexer can receive, but no signal will be emitted).
However, I do not have an isolator for 10GHz so I can't run that test.

Sean

At 08:03 PM 2/28/02 +0200, you wrote:
>Sean Breheny wrote that the signal he gets from the fluorescent light with
>his Gunnplexer is several times stronger than the reflection from a car at
>the same distance (or did I read it wrong). Maybe if the fluorescent would
>have a wire wound on it to form a resonator/reflector at the Gunnplexer's
>frequency the echo and modulation would be even stronger.
>
>Peter
>
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