I haven't connected a keyboard to my P3 yet, but I have had issues with the
shack PC.
It's been fine on 160m thru 20m but I had issues above 20m when I changed
keyboards. As the original keyboard that I used was OK re-connected it and
forgot about it.
Last Wednesday with the original keyboard connected, I was on 20 metres when
the lights on the keyboard went off and there was no output to the PC. I
found the cure was to use a large Type 31 ferrite ring and wind 4 turns of
the keyboard USB cord onto it, right close to the USB connector at the PC
end.
Perhaps this will help you with your P3 issue.
73,
Alan. G4GNX
-----Original Message-----
From: ANDY NEHAN
Sent: Friday, November 24, 2017 8:34 PM
To: [email protected]
Subject: [Elecraft] RF feedback problems with P3 and external keyboard
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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