The German magazine "Funk amateur" january 1999 issue has an article on how
to build a "private radar".
It uses the KMY-24 from Siemens (priced around 100 DM). It works at 2,54 GH.
The interface circuitry is build using 10+ "discrete"(no mcu's)  ICs, and
uses a ICM7217 to display distance or speed.
Caveat: max. detectable distance is 8 m! :-( But perhaps Siemens has other
and better units ?

-cp



-----Original Message-----
From: Peter Grey <martech@OZEMAIL.COM.AU>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: 17. januar 1999 04:26
Subject: [OT] proximity detector


>I wonder if anyone can help. I have an application where I wish to
>photograph a boat and people at night (IR camera) but need to be able to
>detect that they are there and in which direction (so I can point a camera
>at them). This is to monitor offshore property. I need to get a range of
>some 100 metres reliably. Hydrophones have been suggested but I am
concerned
>about directional capabilities and possible interferences. Does anyone have
>any ideas in this field?
>
>TIA,
>
>Peter Grey
>Neosystems