OK thanks for the explanation, David. Still sounds good to play
with. If the shipping cost doesn’t kill me, I’ll give it a try. Chs Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
Sent: Sunday, 21 February 2010 10:21 a.m.
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
Hugh,
I can't claim full credit for having discovered how these hailers
do such a great job at what i was attempting. Doug Jackson tried a similar
unit following our lake testing in Tulsa we did together in March of last year
and said it worked quite well. Where I tried to build it, he is more of an off
the shelve guy. Together, we reached this same conclusion that for the money,
these rock!
Think of the underwater speakers some rich people place in their
swimming pools to hear music while swimming...we are exploiting this just a bit
further. We are replacing this "music" with our own voice and adding
a way to talk back as well.
Its not high tech and is broadband in nature. We are simply
talking underwater at broadband levels. This means anything that makes noise
and can be hear will interfere with your talking and thus shorten your range.
Its also very simple and should provide the range most desire
(500' or less) The other aspect that makes this so appealing is cost. If your
on Alvin 1/2 mile down, this just won't do you at all but at anywhere fro
$20.00 to $800.00 for he more elaborate units its really not bad.
The range? truth is no one really knows for sure and the use of a
working system that cost me only $1.00 (plus $17.00 shipping) in Fort Pierce
should leave most questions answered and the fact we will use it in salt water
should really be a bonus.
I plan to study this unit in particular as it has a maximum
output that matches the highest output our transmitter can safely work
with...30 watts! The study of reverberations, clarity of sent and received
messages and just the overall simplicity of use are all items I am anxious to observe.
Its hands on fun at its best.
See you in Florida God willing!
David Bartsch
From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
Date: Sun, 21 Feb 2010 09:25:29 +1300
Hi David, Sorry to be so backward but what is the
capability of what you are suggesting. Is this setup with the bullhorn
capable of transmission between sub and surface? If so, then what would
you expect the range to be and what frequency would it operate at. Seems
a wonderful way to go but I want to understand fully what you are suggesting.
I’m a bit slow on these things. Chs, Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
Sent: Saturday, 20 February 2010 11:40 p.m.
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] revelation
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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