Not just any ferrite will choke rf at HF frequencies. The most efficient
ferrite mixture for RF choking at ham frequencies is Mixture 73 and Mixture 77
It may be worth a few bucks to get the proper ferrite material to eliminate a
pesky rf problem with a keyboard.
Fraser Robertson wrote:
> Does anyone have any top tips on improving PC keyboard RF immunity?
> I get a problem on 7MHz with one particular antenna. Ferrites on the cable
> don't help.
New Orleans, Louisiana
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