Check out K9YC Jim Brown's page here. He's done a lot of work on this subject.
http://www.audiosystemsgroup.com/K9YC/K9YC.htm
The specific type of ferrite is critical. The front runner for low HF (where
most issues are these days) is type 31. It's
exceptional.
73, Jeff ACØC
www.ac0c.com
-----Original Message-----
From: DAVE WHITE
Sent: Tuesday, October 26, 2010 1:39 AM
To: amps@contesting.com ; dezrat1242@yahoo.com
Subject: Re: [Amps] construct ferrite "line isolator"
Interesting. So I guess the question is "why?"
Why would powdered metal work better? Is it more lossy at HF?
cheers
Dave G0OIL
For what it's worth - I have found ferrites to be all but useless at HF
for preventing RFI, even when used in large numbers. I have had much
better success with powdered iron toroids.
73, Bill W6WRT
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