Re: [CQ-Contest] Wireless keyboards and RFI

[Jim Brown <k9yc@audiosystemsgroup.com>]

On 9/14/2021 9:27 AM, John Geiger wrote:
> I put a torrid on its cable before
> hooking it to the computer for the first time, but that doesn't seem to
> help.
If this is on HF, turns must be wound through a #31 core to form a choke 
that's effective on HF.
There are many conditions that can put RF in the shack. For example, 
antennas very close to the shack, end-fed antennas without a choke at 
the feedpoint, end-fed antennas without a counterpoise.
73, Jim K9YC
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