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AM toroid rings?

E

engine the evaneer

Does anyone have a good site to order AM toroid rings from? I've ordered some in the past, but lost track of which toroid work for which frequencies, I have a complaint about our AM (1570 kHz) causing some problems to someone's laptop/charger, and I'd like to start with a toroid on the charger chord to trap out some of the resonance. Thanks!
 
Amidon Associates is a good place to start.
There are also some Ham Radio-oriented sites that specialize in them.
I think I ordered some from Newark a while back.

Be sure to get the correct "mix", though. The "Mall" stores usually sell ones that work from about 25 to 250 MHz...that's why some of the commenters on their websites will claim they "don't work".

Here's a link to somebody who has studied this stuff to the max:
http://audiosystemsgroup.com/RFI-Ham.pdf
 
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