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Hi David, thanks for the monitor link.
Was looking at a similar Chinese one recently. Have bought
a video recorder that doesn't go, to
see if I can use the lense & screen from
it.
Had a thought that with your communications device, maybe
for boat to sub communication you
could have a unit from the boat suspended on electrical
cable 100 ft below. All the noise like waves
breaking, outboards etc happens near the surface, so you
may be able to eliminate a lot of this, this
way.
Also along this vein you might find that boat to boat communication could
be good
at depth; especially if the motors were turned off.
Alan
----- Original Message -----
Sent: Sunday, February 21, 2010 2:35
PM
Subject: Re: [PSUBS-MAILIST]
revelation
David,
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
were "up to 500 meters".
Alan
----- 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
Hi David,
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!
Best Regards,
Jim K
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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