Hi,
Just so everyone knows. The safety committee is
looking into possibilities for underwater
communications since radios have limitations
underwater. We have yet to come to any conclusions for
a reasonable cost recommendation.
Currently we are looking at scratch built, kit built,
or off the shelf alternatives for sub-to-sub and
surface-to-sub communications. If you have any ideas
or recommendations we can look at by all means speak
up.
Our tenative schedule is to have something decided for
use for the 2009 PSUBS Convention. Which means soon
enough that owners can retrofit their subs in time.
Other projects the safety committe is working on are a
standardized buoy and more fomalized dive operations
plan. Both are going to be critical when operating in
USCG waters at the 2008 PSUBS Convention.
Just thought you would like a glimpse of some of the
behind the scenes work. Details will be shared when
appropiate.
Regards,
Ray
--- Emile van Essen <emile@airesearch.nl> wrote:
James,
Sorry for the language. One click further was
English .
But the price was noted there. 1100,- Euro for one
unit. Maybe somewhere
else for 2 units a better price.
Team Nemo and the C-quester from U-boatworx uses
this sets; Sound quality is
perfect but I don't know how the transducer is built
in.
Both OTS and ocean reef can work on 32.768 KHz. So
you can chat with other
psubbers ;-)
Regards, Emile
-----Oorspronkelijk bericht-----
Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
Namens James Frankland
Verzonden: woensdag 24 oktober 2007 15:01
Aan: personal_submersibles@psubs.org
Onderwerp: RE: [PSUBS-MAILIST] RFC - Radio
communications for submersible
dive operations
Hi Emile
That ocean reef system look really good.
My Dutch is a bit rusty, so Ive found the page in
English here!
Thanks
James
http://www.oceanreefgroup.com/
----- Original Message -----
From: Emile van Essen [mailto:emile@airesearch.nl]
To: personal_submersibles@psubs.org
Sent: Wed, 24 Oct 2007 12:49:56 +0200
Subject: RE: [PSUBS-MAILIST] RFC - Radio
communications for submersible dive
operations
James,
A CB does not work in salt water. The more
electrical conductive, the worse.
It is good to have a CB or VHF for surface and a
acoustic for submerged.
The Ocean Reef surface station is a option for sub
to sub or sub to surface.
www.divequipment.nl/producten.asp?categorie_id=15&product_id=325##
or some more expensive
http://www.oceantechnologysystems.com
The trancducer may have a depth limit.
Emile
-----Oorspronkelijk bericht-----
Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
Namens James Frankland
Verzonden: woensdag 24 oktober 2007 10:11
Aan: personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] RFC - Radio
communications for submersible
dive operations
Hello Carsten and all.
Interesting to hear that CB penetrates the water to
24 feet. Would the
range of the radio be improved if the recieving
antene was dangled into the
water? Does it work in salt water?
Does anybody have any sort of submerged sub to ship
communication that works
with salt water? I believe its quite hard to
achieve except at low
frequencies.
I checked out a company that make data communication
devices for oil rigs.
They are very expensive, but apparently they are
developing a new system for
divers that is more reasonably priced. ok, its not
voice, but a txt message
from 1km away is still pretty good!
Here is a copy of an email i recieved from the
company.
regards
James
Hi James,
We have done some work on acoustic through-water
communication using subsea
acoustic modems and have supplied several systems to
date. Each has been
different as each has been tailored for specific
applications.
Typical applications have been to send data from a
subsea sensor to the
surface, but we have also worked on a few AUV
projects where commands have
been sent to the vehicle from the surface, and data
has been sent from the
vehicle to the surface.
However, to my knowledge we have not yet transmitted
speech through water.
It may be something we are looking at, as we are
developing a new ?micron?
modem which, amongst other things, will hopefully be
very useful to the
diver market.
Our acoustic modem systems currently range in price
from around UKP 11,000
to UKP 25,000 depending upon the setup.
The new micron modem, able to transmit low data
rates up to 1km, should be
around UKP 2,000 per subsea head.
I hope this initial information helps.
Best regards,
Paul
Paul Hudson
Marketing Executive
Tritech International Limited
Peregrine Road, Westhill Business Park, Westhill,
Aberdeen, AB32
6JL.
++ 44 (0)1224 744111 (tel)
++ 44 (0)1224 741771 (fax)
www.tritech.co.uk
Tritech International Limited is registered in
Scotland.
Registered number: 85501. Registered office: 34
Albyn Place, Aberdeen.
----- Original Message -----
From: MerlinSub@t-online.de
[mailto:MerlinSub@t-online.de]
To: personal_submersibles@psubs.org
Sent: 23 Oct 2007 18:11 GMT
Subject: Re: [PSUBS-MAILIST] RFC - Radio
communications for submersible dive
operations
Nemo and Peppers has CB-Radios for communication,
with support boats
but this works also underwater in fresh water on
short distance as sub to
sub communications.
CB works underwater to surface support about 18-24
feet. Sub to sub about
9-18 feet.
Euronaut has both CB and VHF marine radio.
In Germany you need a radio-operator licence to
handle a vhf-radio - for a
CB not.
For a freshwater lake boat the (here) cheaper CB is
okay,
- a offshore sub should have better vhf.
External antenna is required on steel hull subs in
both cases.
regards Carsten
" Dan. H." <jumachine@comcast.net> schrieb:
> I don't have a marine radio in my sub. I just use
a CB type walkie
talkie,
> but I should have one and so should every boat. I
think it's a good idea
> and I'll get one installed in my sub for next
season.
=== message truncated ===
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.488 / Virus Database: 269.15.8/1089 - Release Date:
10/23/2007 7:39 PM