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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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bad ground = phone hum?
There is a heavy wire running from the outside phone box (company side)
to a big spike in the ground. I clipped that with hedge clippers some years ago, then I repaired the break merely by twisting the ends back together and that worked okay for many years.. Today there is a bad, constant hum on all phones. When I plugged a phone into the outside box jack, the hum was the same. It has also been raining for several days. Can a bad ground cause a hum? Vigorously shaking the ground wire caused no static. What should I expect if I disconnected the ground entirely? (As I write this, I'm thinking maybe with corrosion the path to ground is now non-existent.) Also, there was a wasp nest in the customer side of the outside box (but not in the company side). The nest didn't seem to create any obvious destruction, though. If I connect a phone to the jack on the customer side, then the nest seems to have no involvement anyway since the terminals on that side become irrelevant - but you never know. |
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