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Hi, Max - sorry for the late response, I've been
overseas.
Thanks for the great info. Now to decide
whether VLF would be easier to implement than a hard-wire to the float.
Guess the ham guys will fill me in there. I know that VLF carries less
information - or is that ULF . . .
Cheers and thanks again :-)
Rick
----- Original Message -----
Sent: Saturday, March 08, 2008 7:04
PM
Subject: Re: [PSUBS-MAILIST] radio
link
Rick,
My HAM friends tell me you are looking for a Very
Low Frequency (VLF 3KHz - 30KHz) set up like the military uses, and the good
news is that you can DIY one fairly easily. (So they said.). I
believe that this frequency gets some 20 meters of penetration, but that's
just a ballpark rumor I have.
I haven't built one, but I'm connected to
some hams in Napa and Washington state and would be happy to get you some
contact information if you're interested in talking to them. They will
have the math at their fingertips to tell you what your power and range
requirements will work out to. They'd also know how to avoid stepping on
any legal and military toes.
http://www.radio-flier.com/diy_corner.html
- you'll find VLF for an example receiver. I would advise
google/shopping around for more information.
I'd bet the HAMming
community would be happy to help someone building a PSUB. It just seems
like the hard-science, unique kind of projects they enjoy.
--Max
Elliott
On Sat, Mar 8, 2008 at 6:29 PM, Rick and Marcia < empiricus@telus.net> wrote:
Has
anyone figured out how to establish a radio/video link with a surface
vessel?
My somewhat non-tech mind is thinking of a hard-wired connection with
the antenna attached to a diver's float.
How far from the transmitter can you run an antenna?
I have offers from the Canadian Coast Guard to act as standby divers
but I'd like to give them a play-by-play on her maiden voyage.
Rick Lucertini
Vancouver,
Canada
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