[Hpsdr] Call for Comments - ALEX

[Chris Albertson]

> I don't think the shielding of aluminum is "High Performance" for
> EMI/HF
> signals, at least not for the magnetic field part of it.

What did Michael Faraday have to say about this? 

As I remember a hollow conductor will shield the interior from
electromagnetic fields.   All it has to do is conduct.  A good
example of non ferro magnetic shield is the braid on coax cable.
The way it works is there is current induced in the shield that
is opposite and exactly cancels the exterior field.  As long as the
magnetic field is not static the box wil take care of it.
But we don't care about static feilds they don't couple to the
electronics inside.

Sad part is that I used to remember the mathematical derivation
of this.

Chris Albertson
  Home:   310-376-1029  chrisalbertson90278 at yahoo.com
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