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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