As long as you don't saturate it, bend it, hit it or drop it. Depending on the 
ambient field a multilayer shield with outer layers of high saturation magnetic 
material may be required.
Bruce
 

    On Thursday, 25 August 2016 7:02 PM, David J Taylor 
<[email protected]> wrote:
 

 From: Bruce Griffiths

You'd need a rather thick copper jacket to shield effectively against the 
50Hz magnetic field.
Bruce
==============================

Would mu-metal be any use?

  https://en.wikipedia.org/wiki/Mu-metal
  http://mumetal.co.uk/

Cheers,
David
-- 
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
Twitter: @gm8arv 

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