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Forums | Crystal Radio Think Tank ** Advanced Forum | Tuner shielding Post Reply Send Topic To a Friend
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golfguruPosted - 2 October 2012 19:5  Show Profile  Email Poster  Edit Message  
In the event of wanting/needing to shield a tuner from unwanted signals (AM or FM) would an aluminium shield do?, or would a ferrous shield be required?

Could a ferrous shield protect without the need for grounding?

Thanks.

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Edited by - golfguru on 10/2/2012 8:23:17 PM

Bob WeaverPosted - 2 October 2012 20:56  Show Profile  Email Poster  Edit Message
Go with the aluminum.

In my experience, ferrous shields are only intended to protect against stray non-varying magnetic fields due to things like speaker magnets or the earth's magnetic field, and are used around things like CRTs.

On the other hand, a conductive shield made of copper or aluminum will keep out both alternating magnetic and electric fields caused by stray RF.

Edited by - Bob Weaver on 10/2/2012 8:58:12 PM

golfguruPosted - 2 October 2012 21:5  Show Profile  Email Poster  Edit Message  
Could it be floating (not grounded)?

Thanks, Bob

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Electronic TechnicianPosted - 2 October 2012 22:44  Show Profile  Email Poster  Edit Message
Ground it to your radios ground. Any shield should be big or it will degrade Q.

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