Several ideas, pull the pair loose at both ends.
check for high resistance (in megohms) from the pair to ground. If you get a reading, the cable is wet or has creep paths somewhere. make sure there are no "taps" to other cable if there are blocks in a basement mounted on a backboard, make sure they are dry and clean. mold will form a creep path in cool damp locations, especially on plastic devices. make sure all cable is pair twisted (like cat 3 or 5), just a short piece of the old style "station D" cable will add hum and crosstalk to a perfectly good install. Any of this r/gn/y/bk unpaired/untwisted should be removed, this stuff is questionable for even doorbell wire use ;-) ultimate test, lay a piece of good cable from the demarc to the ksu, see if the noise is still there, it still could be a telco problem. (this is a temp cable layed point to point just to test, thru the doorway, window etc) If the noise is still there, it's not the in-place cable. a "ground loop" (ac voltage differential in the power line grounds) will make the hum appear when you connect a ksu, but won't show up with a butt-in set. -larry --- Collin <[EMAIL PROTECTED]> wrote: > Greetings Masters of Low Voltage! > > I have hum problem I'm trying to figure out. From > where the phone line comes in to a back house, it > travels about 150' underground via CAT5, then > another 75' in the attic of the front house to the > KX-TA625. Another CO line comes in directly to the > front house. The line traveling the distance from > the back house has a noticable hum, while the front > house line does not. > > This hum is not at the demarq. point, so I don't > think it is the phone co. > > Anyone have any suggestions? > > Thanks, > > Collin > __________________________________________________ Do You Yahoo!? Find the one for you at Yahoo! Personals http://personals.yahoo.com ********************************************************* * To unsubscribe, e-mail [EMAIL PROTECTED] * * The KXT-Digest Home Page: http://kxthelp.com/ * *********************************************************
