Path: 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

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