"kloud9y2k" u39589@uwe wrote:
professorpaul wrote:
What is going on here is pretty simple. You must be close to an AM or
FM transmitter. Either a semiconductor part or corroded connection is
acting as a rectifier -- "crystal set," if you like. See if there are
any clearly corroded connections in the system, especially if you live
by any body of water. Here at the Delaware shore I've used a lot of
silicon grease on stuff for just that reason. Also see if one
telephone is more of a problem than another.

/paul
W3FIS

Thank you for the information professorpaul. The house has just been rebuilt
so all wiring and materials are brand new. The framing of my house is steel,
could this add to the issue?

Well, it can't be an FM station, only an AM one.

Generally it isn't as easy to be quite as assertive
about causes and effects as it is in this case, but
three lines and three phone and only in one room...
sorta eliminates a lot of things!

Generally modern telephones (with more active
electronics inside them) are a bigger problem with this
sort of thing than older ones. Normally swapping
telephone sets is a good idea. But, with three of them
you are doing that. Same with the lines.

The key is probably the fact that it only happens in one
room, and the "framing of my house is steel". There is
still some question as to *exactly* what is going on,
but the best bet is that the cable to your phone lines
in that room was damaged, or at least in some way
compromised, when it was installed. Telephones
basically depend on a "balanced" circuit to prevent a
variety of things, and it sounds as if the balance on
your lines is not good. But only in that room, and
probably only at relatively high frequencies. As in,
somebody tightly wrapped the cable around a piece of
steel. I'd expect that if the cables were actually
broken open and wires were bare and touching something
that you would also be complaining about a loud hum.
Lacking that, it is more likely not that bad.

If this cabling is all in one sheath, it is very likely
that the grounding has been damaged. In that case it
might have an outer shield of aluminum, and that has
been allowed to touch a steel beam or something like it.

There are all sorts of odd possibilities, but the same
corrective action is require for any of them. Replace
the cable.

Before you do that though, get a roll of CAT5 cable and
go to the next nearest room with a telephone jack, and
run CAT5 from that jack into the problem room, and hook
a phone up to it. It should be without the music. If
so... replace the existing cable.

That may or may not be easy. If it goes into a crawl
space or in any way allows inspection of significant
parts of the run you might want to go looking for
anything odd. Kinks, twists that break the sheilding or
even just the sheath, etc etc. But most likely it is
run through walls and not only is inspection going to be
impossible, but replacement may be danged difficult too.

--
Floyd L. Davidson http://www.apaflo.com/floyd_davidson
Ukpeagvik (Barrow, Alaska)