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Re: [PSUBS-MAILIST] radio link
Thanks for the link, AG. Will check it out.
Cheers
Rick
----- Original Message -----
From: <ag@desertstar.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, April 10, 2008 6:36 AM
Subject: RE: [PSUBS-MAILIST] radio link
>
> All,
>
> FWIW, there is a company in the UK which claims to have made some
> advances in underwater radio comms. There literature is short
> on technical detail, but they have done some demos and are funded.
> http://www.wirelessfibre.co.uk/
>
> I am not aware of any one else offering production underwater rf systems
> commercially.
>
> Their data sheet for their S1510 claims 100 bit/sec, which can be done
> pretty easily acoustically. The don't specify range. Their broadband
> modem claims 100 Kbit/sec but at a range of only 5m.
>
> I would still go with a hydroacoustic system unless broadband acoustic
> noise was a huge factor.
>
> -a
>
>
> > Rick,
> >
> > Yes it will, you just have to be careful of submerging the antenna while
> > transmitting which will result in blowing your transmitter. The tourist
> > sub
> > I was considering being the maintenance manager for used a similar
> > arrangement but didn't dive deeper than 50 ft. Anything trailing from a
> > sub
> > is at great risk of fouling especially in thrusters/prop. Ultrasound
> > (UQC)
> > is the best way to go.
> >
> > R/Jay
> >
> >
> >
> >
> >
> > Respectfully,
> >
> > Jay K. Jeffries
> >
> > Andros Is., Bahamas
> >
> > Vive vt vivas
> > - Live that you may live
> >
> >
> >
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Rick and
> > Marcia
> > Sent: Thursday, April 10, 2008 01:25
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] radio link
> >
> >
> >
> > Hi, Jay - so if I have a VHF onboard and run an antenna cable to a
float
> > (with the antenna attached above water) that would work?
> >
> >
> >
> > Rick
> >
> > ----- Original Message -----
> >
> > From: Jay K. Jeffries <mailto:bottomgun@mindspring.com>
> >
> > To: personal_submersibles@psubs.org
> >
> > Sent: Friday, April 04, 2008 3:48 AM
> >
> > Subject: RE: [PSUBS-MAILIST] radio link
> >
> >
> >
> > The antenna length for VLF and energy requirements for the radio will
far
> > surpass that of a VHF radio.
> >
> > R/Jay
> >
> >
> >
> >
> >
> > Respectfully,
> >
> > Jay K. Jeffries
> >
> > Andros Is., Bahamas
> >
> > Vive vt vivas
> > - Live that you may live
> >
> >
> >
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Rick and
> > Marcia
> > Sent: Friday, April 04, 2008 07:29
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] radio link
> >
> >
> >
> > 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 -----
> >
> > From: Max Elliott <mailto:max.elliott@gmail.com>
> >
> > To: personal_submersibles@psubs.org
> >
> > 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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