[Boatanchors] 2nd Newbie Q

[W2HX]

The reason is, if you attach shield on both ends, you have a risk that the ground potential of the two ends are not the same exactly the same (Think of interconnecting two different devices together with coax. Like an exciter and amplifier plugged into different house circuits). If they are not exactly the same, a current will flow. If the current has any AC component on it, it will induce an AC signal on the inner conductor(s) of the cable which is exactly what you are trying to avoid by using a shield in the first place.  

With only one end attached, you get the shielding properties and no risk of a current on the shield. Hope this helps

73 Eugene W2HX

-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Bob Jackson
Sent: Wednesday, September 10, 2014 11:30 AM
To: porch.boat; puck.boat; qth.boat
Subject: [Boatanchors] 2nd Newbie Q

I've noticed that some construction articles involving the use of shielded cables advise that the shield be connected at only one end but they don't say which end, i.e. near or far. Also, when is this practice most useful and why?

Thanks again,

Bob  AG5X
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