[TowerTalk] Snap-on Ferrites

[john at kk9a.com]

A lot of the examples on K9YC's site show snap-on ferrites. Also the part
numbers for some snap-on models are shown in your "Ferrites useful to hams
for suppression and chokes" list. Of course we know from Jim's site that
to be effective at HF they require multiple turns. No reason was given by
WB8IMY as to why they were not effective and I assumed that they were
wrapped the same way that the solid cores were in his examples.

John KK9A


To:	towertalk at contesting.com
Subject:	Re: [TowerTalk] Snap-on Ferrites
From:	Jim Brown <jim at audiosystemsgroup.com>
Reply-to:	jim at audiosystemsgroup.com
Date:	Sun, 18 Jun 2017 20:00:35 -0700


He's absolutely correct. Many times I've posted a link to my tutorial on
the topic. I spent years learning how this stuff works, and months writing
it up. I won't repeat it here. Only the link. k9yc.com/RFI-Ham.pdf

73, Jim K9YC

On Sun,6/18/2017 7:44 PM, john at kk9a.com wrote:
I was reading the recent QST article RF Mayhem by WB8IMY. The author said to
avoid using snap-on ferrites for problems caused by HF signals as they
rarely work well at HF. It is best to stick with circular cores.

Is this correct?  I was not aware that snap-ons were less effective.

John KK9A