[Elecraft] RF feedback problems with P3 and external keyboard

[Jim Brown]

Good advice, Kevin, especially winding as many turns as practical.  I 
wouldn't add the extension unless a choke without it didn't solve the 
problem.

73, Jim K9YC

On 11/26/2017 8:52 AM, Kevin Stover, AC0H wrote:
> The mix of the toroid's used does matter. Mix 31 is best.
>
> Here is what I did with a USB mouse.
> I bought four mix 31 snapon's and installed two 18 inches back from 
> the mouse and another pair 18 inches back from the connector, winding 
> as many turns as would fit. I bought a USB extension cable and wound 
> most all of it on a mix 31 2.4 inch toroid. This choke was installed 
> on the computer end and the choked mouse cable was plugged into that.
>
> All of this assumes you have things properly bonded, especially the 
> computer case/chassis.