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RE: [PSUBS-MAILIST] RFC - Radio communications for submersible dive operations
Ray,
I use two Divelink surface comm sets, one in the sub and one on the
surface. Basically I'm happy with the audio clarity, but I have had a
few issues with it's (lack of) ruggedness. I've used it up to maybe 300
feet from the boat with good reception, and haven't yet discovered what
the practical range is. By all reports the OTS units are much sturdier,
though of course more expensive.
I'd suggest if you want to establish a standard, we shouln't do so on
any manufacturer. Instead, we should look at different manufacturer's
operating frequencies and settle on whatever is most common, if there is
something common.
To me at any rate, comms are really a fundamental safety feature.
Thanks,
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Ray Keefer
Sent: Wednesday, October 24, 2007 2:08 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] RFC - Radio communications for submersible
dive operations
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 ===
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