David,
We have spent many hours arguing over the crackling you hear on
boats which is amplified at night. Used to think it was the hull
shrinking or expanding. Then it was the shell fish opening and closing
the shells and now its shrimps snapping. Didn’t even know we had
shrimps. It happens on wooden boats or fiberglass. As too our fish
stock, Our Government in their wisdom is selling fishing quotas to everyone in
sundry and we have Japanese, Chinese, Russians, etc etc all raping our oceans
and local fishing people going out of business. They have stuffed the
North sea and now going to stuff our coast. They come in at night and
fish illegally and our solitary Navy ship, or is it two, is too PC to do
anything to them. So why am I building a Sub? Well, next thing
after I get a noise direction finder is to find how to attach it to a
torpedo!! ;)
Chs Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
Sent: Monday, 22 February 2010 10:05 a.m.
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
HUGH,
seriously, its interesting you could actually hear these. You must have
quite a fish stock there.
David Bartsch
From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
Date: Mon, 22 Feb 2010 09:53:44 +1300
Alan, evidently we do have white croakers. Never
seen them and they are not on the most common fish charts but on google it says
we do. However we definitely have those snapping shrimp or whatever they
are. You hear them at night when you are lying down trying to sleep.
Chs, Hugh
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jay K.
Jeffries
Sent: Sunday, 21 February 2010 6:29 p.m.
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] revelation
Alan,
It is the most prevalent “noisy” fish on SONAR
throughout the world…you just call it something different. J
R/Jay
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Saturday, February 20, 2010 10:17 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] revelation
was
just sighting the stats on variation in range wich could also be applicable to
your unit. ie their range of between 50 & 500 meters
means
you could possibly get a result 10 x better or worse from one days testing to
another.
Do
understand that you are trying to acheive something cheaper than what you might have
on
JAY,
we don't have "CROAKERS" in pristine NZ waters.
-----
Original Message -----
Sent: Sunday, February 21,
2010 2:58 PM
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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