Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2.chuqui_test 8/21/84; site nsc.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!nsc!chongo From: chongo@nsc.UUCP (Landon C. Noll) Newsgroups: net.physics Subject: passing water Message-ID: <1366@nsc.UUCP> Date: Sun, 26-Aug-84 22:08:16 EDT Article-I.D.: nsc.1366 Posted: Sun Aug 26 22:08:16 1984 Date-Received: Mon, 27-Aug-84 03:26:00 EDT Organization: National Semiconductor, Sunnyvale Lines: 23 the other day while in a boat on Ceater Lake with some 1900 feet of water between me and the bottom, i began to wonder what the bottom looked like. so in my mind i constructed a probe with a camera on it to float down to the bottom and explore. but one problem got to me, how was i to pass control signals to the probe, and how was the probe to send pictures back? connecting a L O N G wires to the probe was not the answer i wanted. (i wanted to control the probe from the rim, so a 7 mile wire is the wrong choice) i have heard that radio waves have a hard time passing through large distances of water. is this true? what about other forms of electromagnetic rad? from what i can tell, visable light does not go more than 300 feet. what about micro-wave? etc? note that i am talking about high bandwidth transmission. sonor may not cut it. any ideas? any values on distances would be helpful. does salt water make it worse? chongo <> /\../\ -- 2 is the greatest odd prime because it is the least even prime. Dan Romulus Jurca Cal State Hayward