Hi all responding, When the cable is 4 wire, it is likely that there are 2 twisted pairs in it. If the landlord used 2 wires from different pairs the balance will be bad. Look at the cable and see whether there is used one twisted pair. When u have luck this can save u the digging!
Regards, Harry > The cable itself is probably the problem. I'm no phone expert, but I install > phones once a year, for a convention. The best phone wire is twisted pair > single strand. If your landlord used four wire multi strand, not only will > you have a hum, but also some loss over the distance. Can the wire be changed? > Declan Moriarty > > Was it Jeremy N. E. Proffitt who wrote on Sunday 06 October 2002 14:38: > > It is an extension to my landlord's shop. The hum didn't exist till after > > installation, they used standard four wire phone cable - not sheilded. My > > landlord installed this line himself. If you are in the shop and turn on > > the compressor or table saw, the hum gets worse. Is there a filter I can > > add or something? > > > > Cheers > > Jeremy > > ----- Original Message ----- > > From: Syd H. Levine > > To: Multiple recipients of list CHIPDIR-L > > Sent: Saturday, October 05, 2002 11:48 PM > > Subject: Re: Eliminating 60 Cycle hum on phone line > > > > > > How do you know that is the direct cause? Buried phone lines are > > normally shielded, and power line hum is usually related to a ground fault > > of one kind or another. Another common cause is rodent damage in pedestals > > that can make those spots act like a semiconductor and pick up all sorts of > > noise. Did the hum get worse over time? Did it start suddenly? Has it > > existed since the installation? Who was the wise guy that put em in the > > same trench? Is this a telco installation, or private? ----- Original > > Message ----- > > From: Jeremy N. E. Proffitt > > To: Multiple recipients of list CHIPDIR-L > > Sent: Sunday, October 06, 2002 2:23 AM > > Subject: Eliminating 60 Cycle hum on phone line > > > > > > Anybody out there have any good ideas on how to eliminate a 60 cycle > > hum from a telephone line. The hum is directly related to the phone wire > > being run with 500 feet of power cable in the same trench. > > > > Any ideas would be appricated. > > > > Thanks > > Jeremy -- Author: H.C. Croon INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
