David lays out a reasonable choice for communication equipment. Keep in mind that even though you might lower your transducer down 100 ft. in open water, there are other noise sources that must be contended with that most people don’t realize. The most prevalent throughout the oceans is the croaker which produces a grunting noise and there are usually scads of them making this noise (I have heard the recordings of croakers here on our range which can be quite loud even in 6000 fsw.). The other source of marine life noise originates with snapping shrimp. There is a constant snapping and crackling in the background when you dive on the coral and worm rock reefs here in Florida. If you try to amplify the incoming sound produced by another transceiver that is operating in the audible range, this background noise will become over powering. Ft. Pierce has a preponderance of worm rock with a relatively loud background noise level. Before a whole lot of audible transceivers are built, testing of a few units under realistic open ocean conditions should be made so that a lot of time, effort, and money is not wasted.
R/Jay
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of David Bartsch
Sent: Saturday, February 20, 2010 8:59 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
Alan,
Yes, these SSb systems offer much more reliable communication and greater range.
The simple system I am aiding others in acquiring is of a non critical application where simple casual talking at relatively short ranges is desired. That others need no specialized equipment to listen and talk to you will greatly aid you should rescue efforts to aid in you time of trouble arise.
I feel the most cpmplete and desired equipment inventory would have a VHF radio/ broadband underwater communications console with a SSB UQC system use as the primary underwater communications system...
Console #8 being built for Alec will try something different altogether. His SSB system has a jack used for recording communications during filming operations. This should be broadband and it is this that will be fed into this cheaper broadband system I will be providing him. It is hoped that with this interconnection between the two systems, when he talks on his SSB system, it will also be transmitted so that divers and other submarines not equipped with SSB communications will also be able to hear and understand him...we are trying to marry the two differing systems into one. The returning reply should also be heard as well.
David Bartsch
From: alanjames@xtra.co.nz
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] revelation
Date: Sun, 21 Feb 2010 14:35:47 +1300
Just looking at this underwater communications system. This might give you an idea
of what you can expect with regard to performance variation depending on conditions.
The divers unit goes for $668-, not sure what the boat based unit costs.
They give a range of between 50 to 500 meters depending on noise levels & sea conditions.
I looked at a couple of text message based underwater communication systems, but they
----- Original Message -----
Sent: Sunday, February 21, 2010 5:15 AM
Subject: RE: [PSUBS-MAILIST] revelation
Jim,
That's not a problem at all. In fact, I need to produce a transducer/hydrophone pair for kyle's surface boat and an additional pair for Alec's for use at this coming convention. I will gather...ok, you have me curious, did you have an idea this would work as an underwater comms unit already?
In the next few days or weeks, I'll get an idea as to how many will be needed and mass produce them in an assembly like fashion. Ordering the two part molding plastic in larger quantities will save costs too.
Will your hailer be used as a dipping system for surface boat deployment or for aboard your sub? i ask this to figure interface cable length.
Anyway, no this is not a problem at all. We will discuss this further in the next few days.
David Bartsch
Date: Sat, 20 Feb 2010 09:37:33 -0600
Subject: Re: [PSUBS-MAILIST] revelation
From: kocpnt@tds.net
To: personal_submersibles@psubs.org
I just purchased a GS3000s hailer/VHF Radio on ebay. I hope you can help me put the rest of the system toghther when it arrives!
On Sat, Feb 20, 2010 at 4:39 AM, David Bartsch <dbartsch2236@hotmail.com> wrote:
To all:
Ever heard of a marine hailer?
These things are designed to allow bullhorn type communications from one's dry wheelhouse during rainy and windy weather to other nearby boats.
Take the airborne bullhorn away and replace this with an underwater voice transmitter and also replace the returning pickup microphone with an HBH-2 hydrophone and you have a ready made underwater broadband communications unit!
To make this even more appealing, some newer units are about he size of a new cb console and even contain VHF radios to boot!
Go to ebay and just look at the Standard Horizon Matrix GX3000s Marine hailer and VHF radio. This is for a new unit and its $188.00 and this includes shipping!
Too pricy?... boat yards frequently sell off new but old stock items to make room for incoming merchandise.
Take the Cybernet CTX 100 Marine hailer and intercom also showed on ebay. This old but never sold hailer is going for $49.99 with a $12.00 shipping fee. This is its second such listing.
These hailers run circles around anything I have thus far produced and some have extra desired features to boot...seems I am soon to be out of a job short the transmitters and hydrophones. I can live with this as It was my goal to inspire interest in passive sonar and underwater comms to the point that most subbers look into building or buying something. My goal I feel is soon to be met.
If your not quite convinced, have a look at Alec's old stock but never sold Ray Jefferson in action at the coming convention. He has graciously allowed us to us it for the support vessel and this gives us a chance to run one thru its paces first hand.
To anyone who buys any hailer, I will be here to aid in the construction of the voice transmitters and passive hydrophones or I can assist you in making them as these are not too difficult.
David Bartsch
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