Get the proper shielded stuff. It is available from any telephone supply house. There are special bonding clamps that clamp the foil shielding ay each end. The tough poly insulation coupled with the shield makes an effective armor also. Three or four inches deep is fine and can be done manually with a flat shovel for short distances.
----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Sunday, October 06, 2002 12:23 PM > I am thinking of re-running the phone line for him. The trench has been > closed but I can work in a phone line 1" below the ground on a wet day here. > > I'm thinking of using CAT5 cable for the phone line, would this be best? > > Cheers > Jeremy > ----- Original Message ----- > To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> > Sent: Sunday, October 06, 2002 8:58 AM > > > > 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? > > > > > > -- > > Regards, > > > > Declan Moriarty > > > > Applied Researches - Ireland's Foremost Electronic Hardware Genius > > > > A Slightly Serious(TM) Company > > > > Without the optimist, the pessimist wouldn't know how happy he isn't > > > > > > > > > > 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 > > > > ---------------------------------------- > > Content-Type: text/html; charset="iso-8859-1"; name="Attachment: 1" > > Content-Transfer-Encoding: quoted-printable > > Content-Description: > > ---------------------------------------- > > -- > > Author: Declan Moriarty > > 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). > > -- > Author: Jeremy N. E. Proffitt > 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). -- Author: Syd H. Levine 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).
