Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site fritz.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!zehntel!dual!amd!pesnta!pertec!felix!fritz!zemon From: zemon@fritz.UUCP (Art Zemon) Newsgroups: net.dcom Subject: Having trouble with a cable under a parking lot Message-ID: <1600@fritz.UUCP> Date: Wed, 16-Jan-85 16:23:17 EST Article-I.D.: fritz.1600 Posted: Wed Jan 16 16:23:17 1985 Date-Received: Sun, 20-Jan-85 07:57:28 EST Organization: FileNet Corp., Costa Mesa, Ca. Lines: 36 I just installed a cable between two buildings (under a parking lot) and am very mystified by something. There is 180 Hz, 0.5 V peak-to-peak triangular wave on the lines. Does anybody have any idea what might cause this or how to get rid of it? Is this a "common" problem? More information on my installation: The cable is 12 twisted pairs of 22 guage wire. Although each pair is not shielded, the cable has a shield consisting of braid and foil. The cable shield is grounded to AC ground at both ends. The cable is about 600 feet long. The cable runs through two electrical power distribution rooms and past an industrial 480 V -> 208/115 V transformer. Remember, however, that the interferance is triangular, not sinusoidal. A 60 Hz signal is also apparent on the cable but is of much lower magnitude (about 0.2 V peak-to-peak). The total voltage of the interferance is up to about 0.7 V and this is too high for me to run my Micom 400 local datasets above 2400 baud. What really bothers me about this is that I had been running the same datasets over 6 *miles* of telephone company lines at 4800 baud without problems. Any help would be greatly appreciated! Should you wish to call, my phone number is (714)966-2344. -- -- Art Zemon FileNet Corp. ...! {decvax, ihnp4, ucbvax} !trwrb!felix!zemon