[CQ-Contest] Optical and galvanic isolation

[Bill Turner]

ORIGINAL MESSAGE:

On Wed, 20 Dec 2006 22:07:09 -0500, "Dallas and Lucy" <ludal at dmv.com>
 wrote:

>Single point ground?  I don't believe this exists for even a modestly 
>equipped station.  Please identify where you think the single point is.

------------ REPLY FOLLOWS ------------

The single point is at the wall outlet box for your AC wiring. This is
where all your power supply and chassis grounds should come together.
Please excuse me for using the word "ground", an old habit. "Common"
would be more accurate.

What you want to avoid is having one chassis "grounded" at one wall
outlet and another chassis "grounded" at another. That is what leads
to ground loop currents and thereby to hum in your audio.

Bill, W6WRT