[time-nuts] Cheap Rubidium

[J. Forster]

I'm NOT talking about a steel block. I'm talking about thin sheet steel,
typically 0.020 to 0.050 inches thick.

-John

==============

> Hi
>
> The nice thing about a chunk of soft steel is that it also has pretty good
> heat capacity for a given volume of material. Kind of two birds with one
> stone. The only drawback I can see is that it may need de-gaussing  to get
> it to be reasonably stable.
>
> In any case, you want a full shield, a gap and then another full shield
> inside it. Those pesky little flux lines love to find gaps in the shield.
>
> If you do have either one, you still have to gap it from your magnetic
> field generating currents. Otherwise you just make a better electromagnet.
>
> Bob
>
> On Dec 24, 2009, at 4:50 PM, J. Forster wrote:
>
>> 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.
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>>
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
>
>