[time-nuts] Cheap Rubidium

J. Forster jfor at quik.com
Thu Dec 24 21:50:04 UTC 2009


How good are oranges compared to tanjarines? Different things.

Steel is good at high flux levels. MuMetal is good at low flux, but
saturates and looses it's shielding capability.

In fact, plated soft steel is pretty good stuff. The tin or copper is for
rust proofing and helps at RF because of their relatively thin skin depth.
The plating also aids solderability.

Typically, people use a steel box on the outside with MuMetal on the
inside...  like those Russian "nesting" dolls. ("The Tall Blond Man with
one Black Shoe").

Also, try Googling "Netic-Conetic"

-John

===========


>> If I had a bunch of mu metal sitting in the basement I'd certainly use
>> it in the setup. Last time I checked the stuff was not cheap ....
>
> How good is mu metal relative to typical steel?
>
> I'm interested in shielding/$.  If I have $X to spend on shielding (for a
> hobby project), am I better off spending it on mu metal or junk yard
> steel?
>
> In this case, space or weight is not a significant disadvantage.  (If I
> can
> also use it as a thermal layer, it might even be an advantage.)
>
> ------------
>
> Years ago, I was helping somebody with two displays.  They were
> interacting with each other in unpleasant ways.  We tried some thin mu
> metal.  It didn't help much.  A big chunk of 1/8 or 1/4 steel worked much
> better.
>
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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