[Boatanchors] 2nd Newbie Q

[Mike A]

On Wed, Sep 10, 2014 at 11:40:08AM -0400, L L bahr  wrote:
> Reason: To prevent Ground Loops. If a shield is grounded at both ends the
> potential may be different from one end to the other. Hum can be produced
> in the center wire because of this especially in very low current carrying
> wires such as in audio circuits. The idea of grounding one end is to "break"
> the loop. It most likely won't matter which end is grounded. The most
> convenient end would be my choice.

That said, I have found that using double-shielded cable (center conductor,
insulation, shield, insulation, shield, maybe insulation), with one shield
grounded at each end, can drop noise in really bad enviroments. Think bad
dimmers, arc welder, plasma cutter in a theatre shop, where it all was getting
into the theatre sound system. This was a while back.

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin