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Re: [Amps] RF Interference

Subject: Re: [Amps] RF Interference
From: Steve Thompson <>
Date: Sat, 11 Oct 2008 21:27:38 +0100
List-post: <">>
> Bob wrote,
> I don't know if this will help your problem but here is my experience.  
> My neighbor's garage door would open and close when I was on 10m CW.  
> Ferrites 
> didn't help, but we put a disc ceramic bypass capacitor across the leads from 
> the 
> inside (manual opening) switch for the door.  This cured the problem.  It 
> seems 
> the 
> wires for the switch were a pretty good 10m Rx antenna.

The point is to consider if a sensitive point might be high or low 
impedance. If it's low, a shunt capacitor won't do much, a series 
inductor will so the ferrite works - if it's high, the shunt 
capacitor has the dominant effect.

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