<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.17107"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV><FONT size=3>Good questions; underwater com is something we all want to
improve. Could you please introduce yourself, tell general location?
There may be some PSUBS members close to you.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Best regards,</FONT></DIV>
<DIV><FONT size=3>Jim Todd</FONT></DIV>
<DIV><FONT size=3>Missouri, USA</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 6/2/2014 4:27:44 P.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>Hey I am
a submersible enthusiast and an expert engineer.<BR><BR>One thing that is
bugging me is why communication with devices at great depths (the very bottom
of the ocean) seems to be so hard.<BR><BR>The thing I am working on is
miniature drones fully equipped and deployed en masse to scan and collect data
from the bottom of the ocean.<BR><BR>Primarily, I want to find Amelia Earharts
wreckage ;)<BR><BR>My question is, would it be difficult to create an
underwater device that can communicate via microwave to
surface?<BR><BR>Microwaves on the electromagnetic spectrum can pass through
things in a line of sight manner if there is nothing obstructing
them.<BR><BR>But I am weak on my physics and maybe the several billion tons of
water that it has to pass through would squelch the signal.<BR><BR>Is there a
means of telecommunication with high enough bandwidth to transfer signals from
that distance and that depth?<BR><BR>Although our earth is covered 70% of
water. I think we have seen technology come to the point where a mass
deployment of small controllable drones equipped with detection devices could
search the sea floor.<BR><BR>I would great appreciate your input.<BR><BR>Sent
from my
iPad<BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>