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Magnetic Shielding
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danfman:
I have a cocktail game and I am getting some magnetic distortion appearing on my monitor near one of my Ultrastiks.  Would I be OK if I put a sheet of steel to act as a barrier inside my control panel box between the magnets on the joystick and monitor?
protokatie:
If you do, make sure the shielding is grounded, it works better that way as it will be much more efficient at inducing a current and therefor "absorbing" the magnetic energy coming off of the stick. Query: Does this distortion happen only when you move the stick or is it just because the magnets are too close and distorting the shadow mask? If it is the later case, you may need to move the sticks a few inches further away. Dunno how much shielding will help in that case.
Beretta:
ya a piece of sheet metal will do the trick.. the thicker the better it'll dampin the magnetic field greatly.. put a sheet between teh monitor and the joystick.. if you're still getting it then put a 2nd sheet.
doctorhifi:
Perhaps a small bucking magnet?

Bucking magnets are used to reduce the stray magnetic field of a woofer.  This will allow you to put the woofer closer to a CRT TV screen.  The magnet is glued to the back of the existing magnet system with the magnets repelling each other.  When the magnet are centered, the magnetic field will cancel and it will be possible to glue the magnet on.

http://forum.arcadecontrols.com/index.php?topic=24297.0
BobA:
Magnetic shielding is based on the magnetic properties of the material used.   It works as both magnetic and RF shielding at the same time.   However RF shielding eg copper grid etc does not perform as magnetic shielding so the grounding and conductive properties of the metal are not important.  What is important is that it is responds to magnets and will divert the magnetic fields away from what ever you want to sheild.

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