I just wondered if anyone had any thoughts on this curious little fault.
For several weeks now, I have been plagued by a lot of crackle, pop and hiss on my telephone line.. Lastnight, I lost the line completely.. So, annoyed at this interference with my nightly "web-fix", I took to tapping around the sockets and junction boxes, only to find that the outside junction box on my incoming line was the cultprit.. It was too late and too dark to star messing with it, but a couple of sharp taps restored my line for the night.
Earlier this evening (Saturday) I climbed up to have a look inside the box, expecting to find a broken wire - but it was not so.. Instead, what I found was two loose terminal screws on the terminal strip.. Just poking them was enough to cause the line to be lost and regained, so without further ado, I tightened the screws which seemed to solve the problem, however, as I tapped and probed about looking for any more problems, I was aware of a definite microphony from the junction box.
What I was wondering is this.. If those screws have been loose for many years, then there is likely to be a layer of oxide inside the junction block, and on the screws.. Is it even remotely possible that that such an oxide might have a seniconducting, or resistive property about it that might cause the microphony?
In all other respects, the line is fine now, and noise free, as long as I don't go whacking the junction box with the handle of a screwdriver.. Obviously though, the connection is not perfect, and as such cannot be good for my broadband, even if it isn't real issue for voice traffic.