[RFI] Bonding to a PC
Jim Brown
jim at audiosystemsgroup.com
Thu Feb 28 17:12:25 EST 2019
On 2/28/2019 11:34 AM, N4ZR wrote:
> I want to try to manage RFI in my shack, among other things, by
> bonding all chassis together, including my shack computer, but the
> question has come up - where can I find chassis ground on a PC without
> serial or parallel ports? Is there a design standard, such as
> connecting the power supply chassis to ground buses on the
> motherboard, that makes this easy or does it have to be figured out PC
> by PC?
Bonding should always be to the shielding enclosure (chassis) if there
is one, and this is the required connection point for the Green wire.
DB-connectors are sometimes bonded, so consider the VGA connector (if
there is one). To make that connection to my laptops, I solder a short
bonding conductor to a lug small enough to fit under the retaining screw
for the DB connector, with a single Power Pole on the other end.
If your PC only has USB ports, try making the connection to the shell of
one of them by sacrificing a USB cable like one of these.
https://www.amazon.com/Cable-Matters-USB-Black-Feet/dp/B00C7RXR72
USB is carried on twisted pairs, and cheap cables are often unshielded.
If you're experiencing RFI, using shielded cables might help.
73, Jim K9YC
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