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Article #5500Re: Boosting output of a little walkie-talkie
From: John Logajan
Date: Tue, 07 Aug 1990 18:25
Date: Tue, 07 Aug 1990 18:25
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peter.saulesleja@f630.n250.z1.fidonet.org (peter saulesleja) writes: >Why high current? There is very little current travelling through >the antenna, so you'd require a higher voltage, wouldnt you? After >all, P=VI... And air is a very good insulator. A high current would >be impossible, at reasonable (below 1,000,000 Volts) voltages. The impedance of the antenna/radio wave interface is generally on the order of 50-300 ohms. Given this "resistance" you can come up with the voltages needed for a given power. For simplicity, to drive one watt into a 100 ohm load would require 10 volts. -- - John Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428 - logajan@ns.network.com, john@logajan.mn.org, 612-424-4888, Fax 424-2853
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!nic.MR.NET!ns!logajanReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!nic.MR.NET!ns!logajan From: logajan@ns.network.com (John Logajan) Newsgroups: sci.electronics Subject: Re: Boosting output of a little walkie-talkie Message-ID: <1990Aug7.182544.7140@ns.network.com> Date: 7 Aug 90 18:25:44 GMT References: <90080614412836@masnet.uucp> Sender: news@ns.network.com Organization: Network Systems Corporation, Mpls., MN Lines: 14