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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