[Ronja] Underwater Ronja as a thesis

[CD930]

Zajimava, ale kacirska myslenka.
1) Nikde se zde nepise o sladke vode (prehrady, jezera)....Nechranice mam 
14km ode me, na letni pokusy dobry....
2) Jaka vhodna vlnova delka svetelneho zdroje po sladkou vodu?
3) Ten FM TRX bych po vodou nahradil spise dlouhovlnnym systemem, prece 
jenom 10-20kHz se pod vodou siri lepe (audio, pomala data) nez svetlo...i 
ponorky pracuji v tomto pasmu.

Podle meho by tohle mel prakticky smysl tehdy, kdyz pod vodou pracuje keson 
a potreboval by spojeni s povrchem, ktere mu zajisti povrchova retlanslacni 
boje.
Takto se to bezne pouziva...i u nas.

Na druhou stranu je zajimava myslenka pouzit 10W laser diodu, ale cena 
takove diody je vetsi nez dlouhovlnne radio.
Leda pro prenos 10MBps dat (video)...to se na DV pretahnout neda.
Mluvim o bezdratovych systemech....

-=RYS=-



----- Original Message ----- 
From: "Karel Kulhavy" <clock2 na centrum.cz>
To: "ronja" <ronja na lists.pointless.net>
Sent: Wednesday, December 26, 2007 12:59 PM
Subject: [Ronja] Underwater Ronja as a thesis


There is a thesis about short range underwater optical link based on Ronja
from Mark Alan Chancey from North Carolina State University
http://www.lib.ncsu.edu/theses/available/etd-07252005-171301/unrestricted/etd.pdf

It´s an interesting idea and experiment. Just his receiver PCB/mechanical 
design apparently opens way to a lot of crosstalk between the individual RX 
stages
and he describes problems with sensitivity and signal integrity. He says he 
uses a NTE 415 dual gate MOSFET for which I was unable to find a datasheet 
online.

CLK


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