Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cmcl2!adm!lhc!nih-csl!uunet!comp.vuw.ac.nz!gp.co.nz!zl2tnm!don From: don@zl2tnm.gp.co.nz (Don Stokes) Newsgroups: sci.electronics Subject: Re: Data xfer UNDERWATER ! Message-ID: Date: 23 Mar 91 12:57:04 GMT References: <430.27e07fdb@brb.isnet.inmos.co.uk> Organization: The Time Machine Room Lines: 22 robw@brb.isnet.inmos.co.uk writes: > I need to transmit some data between two systems about 10 feet apart > without being physically connected. > They will not always be line-of-sight, and they may be UNDERWATER ! > > Any suggestions ? How about an acoustic coupler? Make it a bit more sensitive than the norm, and perhaps a bit louder, and error correct to the max. It may not be too hot on dry land but should work wonders underwater. Don't expect terribly high throughput though -- with the vaguaries of the media, I'd expect you'd be stuck with FSK. Failing that, I think you're looking at a low powered radio link, water may be a problem in that respect (I haven't actually tried taking my HT swimming with me 8-). Don Stokes, ZL2TNM / / don@zl2tnm.gp.co.nz (home) Systems Programmer /GP/ GP PRINT LIMITED Wellington, don@gp.co.nz (work) __________________/ / ---------------- New_Zealand__________________________