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Path: utzoo!watmath!clyde!burl!hou3c!hocda!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!hao!cires!nbires!opus!rcd
From: rcd@opus.UUCP (Dick Dunn)
Newsgroups: net.physics
Subject: Re:  Passing large amounts of information thru water
Message-ID: <819@opus.UUCP>
Date: Tue, 18-Sep-84 04:04:08 EDT
Article-I.D.: opus.819
Posted: Tue Sep 18 04:04:08 1984
Date-Received: Tue, 25-Sep-84 05:35:50 EDT
References: <13433@sri-arpa.UUCP>
Organization: NBI, Boulder
Lines: 20

> >re-Re: wavelength vs size of antenna
> 
> >My AM radio is about 1/3000 the size of the wavelengths that it
> >receives.
>...
> And it receives a 50,000 watt signal probably no more than 10-15 miles
> away!

Nice misinterpretation of both intent and facts.  Oh, sure, it's true that
the little radio will receive the 50Kw signal 10 miles away.  It will also
receive a 1 Kw station 20 miles away--a factor of 100-200, but who's
counting?  The interesting fact is that the same little radio can, under
some circumstances, receive a 1 Kw signal from 1000 miles or more.  My
point (lest I be misconstrued as well as >> (Gino)) is that you really
DON'T need an antenna that's a large fraction of a wavelength; you just
have to work on it a little harder.  It means that you might not be able to
use $5 AM radio technology in your underwater ELF receiver.
-- 
Dick Dunn	{hao,ucbvax,allegra}!nbires!rcd		(303)444-5710 x3086
   ...Never offend with style when you can offend with substance.