Article View: sci.electronics
Article #5835Re: Ridiculous Impedance
From: Jim Durham
Date: Mon, 27 Aug 1990 06:19
Date: Mon, 27 Aug 1990 06:19
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1196 bytes
In article <1770009@otter.hpl.hp.com> tgg@otter.hpl.hp.com (Tom Gardner) writes: >Mini quiz: > >Most coax cables have a characteristic impedance of 50 ohms or 75 ohms. > >Why does TAT-7 (Trans-Atlantic Telephone cable number 7) have a characteristic >impedance of 61.8 ohms? > >I'll give a piece of wedding cake to the first person with the correct >answer. Well, I dunno about why, but 61.8 ohm cable would sure be handy. A 1/4 wave section of this would match 75 to 50 ohms very nicely for those of use with lots of 75 ohm aluminum hard line available and 50 ohm antennas. Where can we get some? -Jim -- Jim Durham internet: durham@w2xo.pgh.pa.us ham packet radio: jcd@cs.pitt.edu w2xo@w2xo.#wpa.pa.usa.na
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!dsl.pitt.edu!pitt!w2xo!durhamReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!dsl.pitt.edu!pitt!w2xo!durham From: durham@w2xo.PGH.PA.US (Jim Durham) Newsgroups: sci.electronics Subject: Re: Ridiculous Impedance Message-ID: <128@w2xo.PGH.PA.US> Date: 27 Aug 90 06:19:48 GMT References: <1770009@otter.hpl.hp.com> Reply-To: durham@w2xo.UUCP (Jim Durham) Organization: Jim's Basement , Gibsonia, PA. Lines: 23