Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uwm.edu!ux1.cso.uiuc.edu!phil
From: phil@ux1.cso.uiuc.edu (Phil Howard KA9WGN)
Newsgroups: sci.electronics
Subject: Re: Anti-shoplifting devices
Message-ID: <1991May9.191103.25998@ux1.cso.uiuc.edu>
Date: 9 May 91 19:11:03 GMT
References: <050691.224256WDBURNS%MTUS5.BITNET> <19934@slice.ooc.uva.nl> <1991May9.135021.22131@sparrms.ists.ca>
Organization: University of Illinois at Urbana
Lines: 14

The ones used in a local store are not angled, they are square.

The layers are separated, but there is an indentation at a couple
of points to "connect" the metallic layers.  They form a capacitor
and inductor (the spiraling metal lines).

I have no idea what the frequency is.  I don't have a generator to
set this with.  There are several frequency ranges the FCC has
authorized for motion detectors.
-- 
 /***************************************************************************\
/ Phil Howard -- KA9WGN -- phil@ux1.cso.uiuc.edu   |  Guns don't aim guns at  \
\ Lietuva laisva -- Brivu Latviju -- Eesti vabaks  |  people; CRIMINALS do!!  /
 \***************************************************************************/