[MRCA] Dung shaped motion sensors

[B Smith]

They were referred to as "radio turds", VHF 
transmitters. I used to haul them by the box 
loads, there must be a million of them still in 
place.  (http://www.prc68.com/I/Geo_ID.shtml#Turd)

Z

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From: "Robert Flory" <robandpj at earthlink.net>
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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