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Re: [RFI] Microwave RFI - radiated (?)

To: rfi@contesting.com
Subject: Re: [RFI] Microwave RFI - radiated (?)
From: Donald Kerns <dkerns@cruzio.com>
Date: Thu, 08 May 2008 22:55:15 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
rfi-request@contesting.com wrote:
> Date: Wed, 07 May 2008 16:31:30 -0700
> From: "Jim Brown" <jim@audiosystemsgroup.com>
> Subject: Re: [RFI] Microwave RFI - radiated (?)
> Try more toroids in the stack and use close-wound turns to lower 
> the resonant frequency, using the data for coax of similar size as 
> a guide. If that helps, it's being radiated by the power cord, If 
> it doesn't, it's probably being radiated by internal wiring. 
OK, four (4) turns of the power cord around four (4) of the toroids 
doesn't touch the noise.

That sort of says radiated rather than conducted to me.

The microwave was a wedding present, so it is at least (counts on 
fingers and toes) 13 years old.

I've put a recording up at http://www.kernsanalysis.com/ham/microwave.wav

7.131 MHz, AM mode 9.0 KHz filter  (note how noisy my location is even 
without the microwave...)

73 de Donald

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