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.
On 11/24/2017 2:34 PM, ANDY NEHAN wrote:
After LOTS of experimentation I think I have found that just recently I have
some RF feedback into the usb keyboard on the rear of the P3. This manifests
itself particularly badly with the Genovation keyboard but is also present with
a standard usb keyboard. Oddly enough it is MUCH worse when using the Perwerx
psu than my linear psu - but that may of course be due to different cable
layout for the power cables. I have applied clip on ferrites with great
enthusiasm but to no avail.
I noticed a message on my external vga screen saying "usb device removed" shortly after
starting to transmit and then shortly after that (but whilst still transmitting) "usb device
connected". This is also not present when on low power (say 5 watts) but reappears at 20 watts.
Has anyone else experienced this problem??
Andy
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R. Kevin Stover AC0H
FISTS #11993
SKCC #215
NAQCC #3441
ARRL
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