Yes, in today's digital systems, we maintain (or should maintain) an analog
ground and a digital ground. Nary the two shall meet except at one common
point. For if they do, one can be most assured of digital noise surfacing
in the analog circuits.
73
Bob, K4TAX
----- Original Message -----
From: "Duane A Calvin" <ac5aa@juno.com>
To: <tentec@contesting.com>
Sent: Tuesday, April 20, 2004 10:55 AM
Subject: Re: [TenTec] Orion Jupiter mic connections
> Decades ago, when I was a systems test technician on the big IBM
> mainframe computers, it was very important to have all gounding systems
> (logic ground, power ground and frame ground) separated for the first
> sections of testing. Then, at a point when all the critical checkout was
> completed, they were bonded together at ONE point. This was specifically
> to eliminate ground loops. It's the same principle. I'd like it if the
> ARRL Handbook did a better job of covering how ground loops are formed
> and how to avoid them.
>
> 73, Duane
>
>
>
> On Mon, 19 Apr 2004 21:35:49 -0500 Robert & Linda McGraw K4TAX
> <RMcGraw@Blomand.Net> writes:
> > Ground loops in any system are serious problems. Often they manifest
> > themselves as humm or buzz in audio, which to most, indicates that
> > poor
> > grounding exists and thus more grounds are needed. Quite the
> > opposite is
> > typically true! If one has a ground loop problem then it is
> > reasonable to
> > conclude that more than one ground path exists.
>
> etc . . .
>
>
> Duane Calvin, AC5AA
> Austin, Texas
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>
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