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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