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Re: [RFI] Snap-on Ferrites

To: rfi@contesting.com
Subject: Re: [RFI] Snap-on Ferrites
From: Dave Cole <dave@nk7z.net>
Date: Sun, 18 Jun 2017 22:18:51 -0700
List-post: <mailto:rfi@contesting.com>
Snap on Ferrite's have their uses...

Perhaps a better way to look at it might be to think of snap on ferrite material as a substitute for when a more normal core can not be used.

I have some snap ons that work very well. Well being defined as the ability to stop an RFI event. I use at least two snap ons on every wall wart, one at the wall wart, and one at the device. I take up all slack in the power cable by wrapping half the the excess power cable on each core.

Snap on cores are far less effective than a solid core, however if you can get enough impedance at the selected frequency, a snap on will suppress RFI well enough.

73s and thanks,

On 06/18/2017 07:44 PM, john@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

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