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RE: [PSUBS-MAILIST] RFC - Radio communications for submersible dive operations
Way to go Al! If you can come up with a build-it-yourself design or even
a buy-it-from-Al design, that would be a huge contribution given the
prices for the off the shelf comms. I'm going to pass your email to a
friend who just possibly could help with the transducer issue.
Thanks,
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Al Secor
Sent: Wednesday, October 24, 2007 8:25 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] RFC - Radio communications for submersible
dive operations
Hi Guys,
I have been working on a design for U/W comm for a couple of years now
and have a design that works but needs refining. My design operates on
Double Side Band at 32.768Khz. I chose this frequency to be compatible
with the OTS Buddy Phone on my Aga full face mask.
Now the problem and why I am not ready to release the design....
The biggest problem is securing an omnidirectional transducer with full
electrical specs that doesn't cost an arm & a leg or requires buying
1000+ quantities. The one I'm using now I purchased from OTS for $200
but don't have specs on it so my driver circuit is not optimum. I would
also like to modify my design to be true SSB (Single Side
Band) with a
supressed carrier for better power efficieny. I have an idea on how to
do this but won't get a chance to work on it until the end of December.
We will also need to settle on a frequency since the transducers have a
pretty narrow bandwidth. I obviously vote for 32.768 Khz USB.
I'll try to keep interested parties posted on my progress.
Al Secor - WA3PWX
----- Original Message -----
From: "Ray Keefer" <psubs2001@yahoo.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, October 24, 2007 2:08 PM
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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