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Re: [RFI] Keys, noise, resonance

To: "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] Keys, noise, resonance
From: KD7JYK DM09 <kd7jyk@earthlink.net>
Date: Mon, 31 May 2021 21:17:40 -0700
List-post: <mailto:rfi@contesting.com>
If memory serves me correct, playing around with an ultrasonic
receiver years ago I noticed that car keys gave off quite a bit of
'noise' (ringing and jangling) when shaken

It took me years to figure out that some keys, in a certain order on a ring, would trigger some EAS (electronic article surveillance) systems, as well as trigger some demagnetizers at checkouts. A real PITA.

Kurt

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