[MRCA] Dung shaped motion sensors

[Mike Feher]

I used to have several of these as they were readily available, and cheap,
in the 70's on the surplus market. I still may have a couple in the
basement. Here is a link I found that mentions them, but, I could not find a
photo. 73 - Mike

http://www.globalsecurity.org/military/facility/mcnamara-line.htm


Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960


-----Original Message-----
From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On
Behalf Of Robert Flory
Sent: Wednesday, October 20, 2010 4:52 AM
To: mrca at mailman.qth.net
Subject: [MRCA] Dung shaped motion sensors

Hi,
I was just googling around unsuccessfully using terms like Vietnam, motion,
sensor, dung, microphone, transmitter etc. but didn't find what I was after.

What is the proper nomenclature for the little dung-shaped intrusion
detector?  Are they hard to find?  What frequency and modulation mode do
they use?

Rob Flory
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