I’m not 100% certain….I just don’t recall now Pete. It’s been a few years since
I’ve installed it.
I’d assume the shell (rectangular metal end that slips into the laptops USB
port) ties to the shield on the cable?
I couldn’t find any other good place to tie into the ground on the laptop,
being 99% plastic (at least on the outside)
Someone told me (and I don’t recall who) that even if I had found some kind of
ground on the laptop, that the USB shield may not be at the same potential, so
that’s the first place (usb port) I tried a wire and shockingly, it worked.
YMMV and if you blow up your laptop/computer, it’s not my fault ! hi
CU in RAC Winter I hope. GL with your RFI
Mike VE9AA
Mike, Coreen & Corey
Keswick Ridge, NB
From: N4ZR [mailto:n4zr@comcast.net]
Sent: December 18, 2020 4:21 PM
To: Mike Smith VE9AA
Subject: Re: [RFI] USB RFI
Fascinating, Mike - did the #26 pigtail actually make contact with the shield
on the USB cable (assuming it was shielded? My PC's chassis is bonded to my
ground bus.
73, Pete N4ZR
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On 12/18/2020 12:54 PM, Mike Smith VE9AA wrote:
I can only speak to what worked here. I used to constantly lose connection
to N1MM and also to my Winkeyer (and later, my YCCC SO2R+ box).all on
separate USB cables.
Occasionally, even at QRP levels.
I was plagued with it. My shack looked like a stockpile of Ferrite had
gobbled up all my cables.
In the end, the one thing that proved most valuable was actually super
simple. I took a teeny tiny wire...perhaps a #26, stripped a couple inches
of insulation off the end of it and wrapped it around the shell/shield of
one of the USB cables entering my (plasticky) 10yr old laptop. I attached
that wee pigtail of wire to my station ground with a larger wire.
Voila! 99.9% of my RFI instantly went bye bye.
Good luck.
Mike VE9AA
Mike, Coreen & Corey
Keswick Ridge, NB
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