Jim,
There are probably a few RF bonding holes in our ham shack. 😀
As for finding a auitable ground, I could check to see if the shield of the
HDMI or USB porta are grounded.
Frankly, the easier way to handle this is to try cores on the cables. I have
done this for other Evolve III laptops here, and haven't yet gotten to this one.
73,
J. Gordon "Gordie" Beattie, Jr., W2TTT
201.314.6964
W2TTT@ATT.NET
Gordon.BeattieJr@VIAVISolutions.com
Get On The Air!
________________________________
From: RFI <rfi-bounces+w2ttt=att.net@contesting.com> on behalf of Jim Brown
<jim@audiosystemsgroup.com>
Sent: Sunday, December 25, 2022 10:10:04 PM
To: rfi@contesting.com <rfi@contesting.com>
Subject: Re: [RFI] Another Solar Panel RFI System
On 12/25/2022 6:23 PM, James Gordon Beattie Jr wrote:
> The other day I was running 600W on a dipole close to the ham shack on 40m
> and 80m and a newish Evolve III laptop had its touchpad lock up or randomly
> "left click" when I was transmitting. My desktop machines and other laptops,
> an HP and Dell have no issues. This is a "new" problem that will probably
> get addressed when I move the dipoles in a week or so as planned.
It might also get addressed by filling in any holes in bonding in your
station. Laptops are tricky, but we SHOULD be able to get to the chassis
with the shell contact of I/O connectors if the mfr didn't screw that
up. The most convenient is the D-connector for video, if it has one, but
it should be possible to sacrifice a well-made USB cable and hit the
chassis. :) With D-connectors, I slip a small lug with a wire soldered
to it under the retaining screw.
K6XX and I experienced RF feedback from our antennas to our K4s via a
boom headset plugged into rear panel jacks that are not bonded to the
chassis at the point of entry. It is QUITE bad -- I experienced it when
setting up the the 10M contest, with my TX antenna 200 ft away and 120
ft up, pointed with its back to the shack. This is a classic Pin One
Problem. Symptom is that the rig chatters into and out of TX as soon as
you plug the mic in. To make it work, I had to throw a half dozen or so
ferrite chokes on stuff plugged into that rear panel.
Each time I've visited mfrs booths at Visalia and Dayton, I've studied
the rear panels of their rigs to check for this defect. I've yet to find
a rig that didn't have the defect at most or all of their accessory I/O
connectors. Elecraft got it right for most of the connectors on their
KX3 -- the mic connector is bonded, but I/O for control are not. Last
time around for that was spring 2019, at Visalia.
73, Jim K9YC
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