[RFI] Snap-on Ferrites

[Dave Cole]

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,
Dave
NK7Z
http://www.nk7z.net

On 06/18/2017 07:44 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
>
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