On 9/4/2021 2:03 PM, jerry wrote:
I made up a short length of RG8/U with 4 Palomar 31-mix giant ferrite beads

Palomar SELLS these cores, at high prices. Fair-Rite MAKES them.

 - a common mode choke.  No difference.

This is only a good choke at VHF. If your problem is HF, multiple turns must be wound through the core. Study choke recommendations here.

http://k9yc.com/KillingReceiveNoise.pdf

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

73, Jim K9YC
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