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Re: capacitance and static build up

Are you talking about the build-up of resistance (Ohms) in RG-6 cable? If so, read on. If not, disregard...

a lot of rookie techs will see poor picture (or the dreaded One Moment Please) on the television, but when they check the signal with their meter, levels are good. Then they screw the cable back into the box and, POOF! They fixed the problem. But, over a period of a couple hours or a couple days, the same problem returns. This is caused by a fault in your cable, and resistance is increasing over time. 

How to diagnose: you will have to check both lengths of cable: the jumper and the outlet wire, and the wall plate. Disconnect the jumper from the wall plate and screw on a barrel to the end and cap it with a 75 ohm terminator. On the other end use your multimeter and put your black lead on the outside of the f-connector, and your red lead touching the center conductor. You should read something in the neighborhood of 75 ohms. Hold it there for a few minutes to see if the resistance increases. If it does, that's your bad cable. If not, repeat with the outlet cable and then the wall plate. I'm pretty sure you resistance will read higher: by 2 ohms/50'. So if you have a 100' span, your base measurement will no longer be 75 ohms. It will be 79 ohms.

What your looking for is that increase from your base and the steady climb upward into the 100 and 200 ohm region. 

Good luck,

-r0kK

side note: you can also use this method to find your line in an MDU if you don't have a toner. Just look for the cable with the resistance.
This is CABL.com posting #359325. Tiny Link: cabl.co/mbFDJ
Posted in reply to: capacitance and static build up by Exclusivitytech
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