Richard,
I've heard that some microwaves use switching power
supplies instead of a *heavy*, conventional transformer.
If your appliance uses the switching supply, chances
are that it's "on" all the time so the controls are powered up.
That could be the source of your noise. You might try a
common mode choke on the power cord...see if that makes
a difference. Study the choke info on K9YC's website!!
73,
Charlie, N0TT
On Mon, 27 Aug 2012 13:09:47 -0700 "Richard Saunders (K6RBS)"
<g0ery@cox.net> writes:
> I've had a problem with nose on 10M for some time. It is continiuos
> and starts around 26 Mhz and drops off around 31.5 Mhz. In AM more I
> hear S7 wide band white noise with an embedded a/c buzz.
>
> This weekend I isolated the problem by turning the power off to the
> house and doing a biniary search with the breakers until I found
> that it is an in-built GE Microwave model PVM1870DM3SS.
>
> If does have an option to turn off the display but unfortunately
> that didn't help. For now it is unplugged and my noise on 10M is
> S0.
>
> Any help would be appreciated.
>
> Thanks,
>
> 73 - Richard K6RBS & G0ERY
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>
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