Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site opus.UUCP 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.