[RFI] Ferrite prices

[Jim Brown]

On Mon,12/5/2016 12:19 PM, Tony Fagler wrote:
> Ok I will through this out there. do we have a good reference site on which
> ferrite to use? I have done a few and had mixed results. Doesn't seem to be
> a good laymen page to explain the difference in strength and benifits.

Here are two. One is text with photos, the other slides for a talk I did 
at Pacificon a few months ago. Both include part numbers and "where to 
buy" info. I'll add Arrow to that list.

http://k9yc.com/KillingReceiveNoise.pdf

http://k9yc.com/KillingRXNoisePPT.pdf

And here's material on transmitting chokes (sometimes called current 
baluns).

http://k9yc.com/RFI-Ham.pdf

http://k9yc.com/CoaxChokesPPT.pdf

This material was added to the ARRL Handbook beginning in 2010 or 2011. 
I'm currently working on the update for the 2018 edition.

73, Jim K9YC