Article View: sci.electronics
Article #11804Re: Phone line monitor
From: Jim Cathey
Date: Thu, 12 Nov 1992 18:45
Date: Thu, 12 Nov 1992 18:45
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In article <1992Nov11.130157.21099@email.tuwien.ac.at> ch@eiaut2.tuwien.ac.at (Christian Kral) writes: >There is a simple possibillity of getting rid of this kind of problems, >using a two channel scope which can add both inputs and invert one. _Provided_ that the two signals lie within the common-mode rating of the vertical amplifiers. (For phone lines, this is probably OK. For something evil like an RS-485 line driven by a 'hot-chassis' power supply, you might have some trouble!) -- +----------------+ ! II CCCCCC ! Jim Cathey ! II SSSSCC ! ISC-Bunker Ramo ! II CC ! TAF-C8; Spokane, WA 99220 ! IISSSS CC ! UUCP: uunet!isc-br!jimc (jimc@isc-br.isc-br.com) ! II CCCCCC ! (509) 927-5757 +----------------+ "PC's --- the junk bonds of the computer industry"
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Path: arc1-ca.pugleaf.net!sparky!uunet!gossip.pyramid.com!olivea!isc-br!tau-ceti!jimc From: jimc@tau-ceti.isc-br.com (Jim Cathey) Newsgroups: sci.electronics Subject: Re: Phone line monitor Message-ID: <2819@tau-ceti.isc-br.com> Date: 12 Nov 92 18:45:54 GMT References: <BxGK30.K71@mtholyoke.edu> <27344@oasys.dt.navy.mil> <1992Nov11.130157.21099@email.tuwien.ac.at> Organization: ISC - Bunker Ramo, Spokane, WA Lines: 18