[Elecraft] Re: magnetic fields and phase noise?

[S55M]

What about only changing the plates with normal materials like YaComWood's
do?
I dont know if there would be any improvment?

Adi
----- Original Message ----- 
From: "Stephen W. Kercel" <kercel1 at suscom-maine.net>
To: <elecraft at mailman.qth.net>
Sent: Sunday, March 20, 2005 10:32 PM
Subject: Re: [Elecraft] Re: magnetic fields and phase noise?


> I've seen several mentions of mu metal in this discussion. I offer a few
> thoughts for what they are worth.
>
> Some years back, when I worked in the Electromagnetic Compatibility Group
> at Oak Ridge National Laboratory, we occasionally used mu-metal. The idea
> is that it directly suppresses magnetic field independent of electric
> field, and is thus supposed to be an effective shield for near-field
> situations where the constrained relationship between the electric and
> magnetic field breaks down. (Magnetic shielding of propagating waves is
not
> a problem; kill off the electric field, and the magnetic field vanishes
for
> free.)
>
> Mu metal is expensive, difficult to find, hard to work with if you can
find
> it, and if subjected to mechanical shock, it can lose its mu-ness.
>
> Personally, I would only use it as a last desperate measure.
>
> 73,
>
> Steve Kercel
> AA4AK
>
>
>
> At 01:54 PM 3/20/2005 -0500, you wrote:
> >Earl W Cunningham wrote:
> >
> >>It has been suggested that mu-metal shielding might alleviate the
> >>problem.  I'm considering making mu-metal bottom and side covers for my
> >>K2.
> >
> >If I were having that problem, I'd be thinking about shielding the
> >*source*...because it would likely affect other equipment in my shack.
> >
> >  73 de Maggie K3XS
>
>
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