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Cable Shielding Theory

post #1 of 3
12/8/02 at 8:45pm
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I have a technical question for you geeks. Why do cable manufacturers recommend terminating the shield of a cable at only one end on cables of balanced design (i.e. 2 conductors + shiled) when terminated with single ended connectors? How can this help eliminate hums and buzzes if the ground conductor still has to be connected at both ends? Using cheater plugs works on power cords to eliminate buzzing because you are eliminating a redundant ground connection. But on cables this is not the case. It would seem that connecting a shield at only one end would ruin its shielding properties altogether, to me anyway, because the whole point of the shield is to be connected at both ends. Thanks in advance for any insights here.
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post #2 of 3
12/9/02 at 6:12pm
See the section on shields here:http://www.geocities.com/jonrisch/i1.htm
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post #3 of 3
12/11/02 at 1:28am
Shielding is a very different thing when you are comparing balanced to unbalanced signals. It makes little sense in an balanced (differential) system to not terminate the ground connection at both ends. In an unbalanced system connected with a two conductor shielded cable, connecting the shield at only one end can reduce noise.
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