On Wed, 29 Oct 2008 15:40:52 -0400, Bill Tippett wrote:
>On-site I tried about 8 turns of the
>power cord through a Mix 31 2.4" toroid, but that didn't dent the
>noise enough.
I wouldn't expect it to. You need at least 14 turns on a single #
31, and more turns or more toroids in the stack is better. Use my
measured data for RG8X on these cores as a starting point. In
essence, you've got to move the low Q resonance of the ferrite
choke down to 2 MHz. 8 turns on a single #31 puts the resonance in
the 5-7 MHz range.
http://audiosystemsgroup.com/RFI-Ham.pdf
It's good to hear that the Corcom filter worked for you. A surplus
warehouse in the Bay Area has a bunch of filters like you
describe, and they have an internet presence. I've seen Corcom,
Delta, and several other brands there at good prices.
http://www.halted.com/
There's also good data for Corcom and Delta on the internet.
Google on part numbers to find it.
73,
Jim K9YC
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|