[Elecraft] K2/100 magnetic screening?

[Fraser Robertson]

Has anyone successfully improved the K2's immunity to magnetic fields, e.g. 
from nearby mains transformers?

I'm thinking of making a mu-metal cover to enclose the K2 (apart from front 
and rear), leaving room for air circulation top and bottom.  I think this 
should do the trick, but wondered if less drastic action would surfice, e.g. 
lining the bottom panel with steel or mu-metal.

In my case the nearest mains transformers are two feet away or more, off to 
the sides and rear, and it's not really practical to increase the separation 
further.  I've had reports of less than T9 and tests indicate it's due to 
these transformers, one in the linear amp. and one in the linear PSU that 
powers the K2/100.  No problem on receive, but the magnetic field is 
obviously stronger during TX.

Thanks / 73 Fraser G4BJM #4368.

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