Article View: sci.electronics
Article #2920Cable losses
From: Jeff Lindstrom
Date: Tue, 14 Apr 1992 11:14
Date: Tue, 14 Apr 1992 11:14
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U>Shouldn't the long cable attenuate the signal or even roll of the high
U>frequencies?
It IS attenuating the signal, but too little to notice for the low frequencies you mentioned and the moderate cable lengths you are using.
U>How can I determin the maximum cable length before signal degradation begins?
First, determine an acceptable degradation. Then look at the specs for the cable you wish to use. The major loss will be distributed capacitance (commonly expressed as picofarads/foot or nanofarads/foot). Multiply by the cable length and take the RC time constant from the circuit (can you say Thevenin's Rule? I knew you could.).
Another source for degradation is outside noise coming through the shielding. That will be a function of the shield's construction.
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Jeff Lindstrom
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Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!news.claremont.edu!ucivax!ofa123!Jeff.Lindstrom From: Jeff.Lindstrom@ofa123.fidonet.org (Jeff Lindstrom) Newsgroups: sci.electronics Subject: Cable losses Message-ID: <9843.29EBEDDF@ofa123.fidonet.org> Date: Tue, 14 Apr 92 04:14:08 PDT Organization: Universal Electronics Inc. (Public access BBS) Lines: 19