Re: [amsat-bb] 10GHz radar experiment

["KC6UQH" <kc6uqh@xxxxxxx>]

William,
The standard aproach is to FM the Gunn oscilator with a triangular wave and
the reflection mixed with the transmit frequency give an audio tone who's
frequency is releated to the distance. You are dealing with 200 nS per 100
Feet for a round trip requireing some very short pulses to make the
measurment on a pulse echo basis.

Art, KC6UQH
----- Original Message -----
From: "William Leijenaar" <pe1rah@hotmail.com>
To: <amsat-bb@amsat.org>
Sent: Sunday, November 28, 2004 10:45 PM
Subject: [amsat-bb] 10GHz radar experiment


> Hi AMSATs,
>
> Last weekend I did some more tests with my x-band setup and I find out
that
> the amplitude changes are not due to reflections. The only option has to
be
> the near field behaviour, but I have to investigate that more furture.
>
> The problem now is that doing radar-distance measurments is quet difficult
> with this problem.
> What I wanted to test is the possibility to measure distance closer than
30
> meters. The data of value is not the amplitude but the time delay, but
when
> the amplitude changes rapidly within a few cm then it is not easy at all
to
> measure.
>
> Is there any way to overcome this problem ?
> Maybe with use of a second (lower) frequency ?
>
> 73 de PE1RAH, William
> ---
>
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