Article View: sci.electronics
Article #18902Re: Library book detectors.
From: William Swan
Date: Mon, 21 Mar 1988 20:38
Date: Mon, 21 Mar 1988 20:38
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In article <2530@ihuxv.ATT.COM> tedk@ihuxv.UUCP (Kekatos,T.G.) writes:
>Does anyone know of the history of using L-C circuits. I heard
>that they were used in WWII. The term "Friend or Foe" circuit
>comes to mind.
The use of "L-C" circuits goes a ways back.. but not as IFF (Identification
Friend or Foe) gear.
IFF equipment was essentially a transponder device, designed to reply with
a coded radio sequence upon (as I recall) radio interrogation.
My father worked on this stuff for a while during WWII, and said it was a
bear to service, it was all wired with white wires with thermite charges
distributed throughout, and a .38? shell set up at one end of the chassis
to fire through all the vacuum tubes should self-destruct be required. Once
in a while, of course, a particularly difficult module would accidentally
misfire, making servicing it a moot point... :-)
--
William Swan {ihnp4,decvax,allegra,...}!uw-beaver!tikal!sigma!bill
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!bbn!mit-eddie!uw-beaver!tikal!sigma!bill From: bill@sigma.UUCP (William Swan) Newsgroups: sci.electronics Subject: Re: Library book detectors. Message-ID: <1574@sigma.UUCP> Date: 21 Mar 88 20:38:20 GMT References: <5398@swan.ulowell.edu| <1261@uop.edu| <2521@ihuxv.ATT.COM| <1674@uhccux.UUCP> <20719@bu-cs.BU.EDU> <2530@ihuxv.ATT.COM> Reply-To: bill@sigma.UUCP (William Swan) Distribution: na Organization: Summation Inc, Kirkland WA Lines: 21