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David thanks for the answer,
You're worse than Brent, I make it about 4AM your
time.
Don't you Americans sleep?
Alan
----- Original Message -----
Sent: Tuesday, July 28, 2009 8:39
PM
Subject: RE: [PSUBS-MAILIST] collision
avoidance sonar pics
Alan,
What I found so funny when I first
started working at the Postal Service was just how far some of these people
would go so as not to seem ignorant about anything...
Being new at
the job and unfamiliar with the various terms and phrases, I asked a seasoned
employee what "TARE" weight meant as I had seen this term on the side of
various shipping containers. His reply was "if too much mail was placed within
the container beyond this recommended weight number, the container would tare
open!"
For those of you who are unfamiliar with this term as I was,
TARE weight is the weight of the container void of any contents. Once weighed,
one simply subtracts this tare weight from the total weight to derive at the
weight of the contents. (A useful tidbit if using a postal scale to measure
the amount of water within a given container)
As to the
dirrectionality of the broadband underwater communications systems, these are
omni-dirrectional and should be able to pick up incomming transmissions from
any dirrection as well. Thus far, Dean has talked to and from two seperate
stations from over 300 feet but the maximum range one can communicate with
this type of system has yet to be established.
As per earlier
discussions, background ambient noise will reduce the overall effective range
one can both talk and recieve this type of voice transmission. The louder this
background noise, the shorter the range. For lake submarine operations
with low to medium suface traffic, it is hoped that this simple form of
communications will prove adequate for most
submarines.
David Bartsch
From: alanjames@xtra.co.nz
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] collision avoidance sonar pics
Date: Tue, 28 Jul 2009
19:47:46 +1200
Hi David,
Is the broadband communications system fearly reliant on
being in a set direction ?
ie would it have to be upward pointing to communicate
with the boat or set horizontally at a right angle
to communicate with a sub in that direction, or will the
trial be testing this.
Where I fish a lot there are schools of fish feeding
noisily on the surface throughout summer, with larger fish
underneath.
The passive sonar would be great for tracking the action
in a submarine.
I beleive you said you worked for the Postal Service;
you'll be looking at those Post Office scales in a differant
light from now on.
Regards Alan
----- Original Message -----
Sent: Tuesday, July 28, 2009 6:43
PM
Subject: RE: [PSUBS-MAILIST] collision
avoidance sonar pics
Alan,
I too am anxious to find these
things out as well as much of this is unknown or just "gestimates".
One thing for which I am sure of is that many things
that would normally not be heard will be easily picked up such as boat
traffic even your own boats motors. You could even know when motor
bearings are showing wear long before you would otherwise be aware of
it.
I am holding my breath and patiently awaiting Kyles in-water
performance evaluations. From his report, future sonar system might have to
be altered depending upon that which he finds.
His set up
incorporates a new type of passive hydrophone that no longer requires an air
filled resonance chamber in order to operate. Initial testing results show
this hydrophone actually works better when compared side by side with
earlier HBH-2 units. The greatest advantage would be a much deeper depth of
operation with no air bubble to maintain.
Another bit of sonar
news would be that Dean is soon to launch his sub with the first deployed
broadband voice underwater communications system installed. Once in the
water, He will be in a position to communicate with his other complete
system deployed on his support craft and should let us know how well this
system works in the field. Console #6 will be installed aboard his friend
Kyle's submarine that is already in the
water.
David
Bartsch
From: alanjames@xtra.co.nz
To:
personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] collision
avoidance sonar pics
Date: Mon, 27 Jul 2009 09:19:07 +1200
That looks good David,
Be interesting to see what kind of range it has &
how wide an angle it picks up on.
Alan
----- Original Message -----
Sent: Sunday, July 26, 2009 10:35
PM
Subject: [PSUBS-MAILIST] collision
avoidance sonar pics
To All:
Kyle is in the process of
installing a collision avoidance sonar system I recently produced for his
K-250 submarine. Take a look under special projects and photos under
collision avoidance and my name for some neat pictures! The system was
built with small submarines in mind where space is premium.
This
system should be under testing in about two weeks and promises to become a
must have item.
In that it contains but a single amplification
channel, it really represents the most basic passive sonar I can
conceive.
It is made from an easily acquired Radio Shack project
box and other equally available items for you do-it-yourselfers.
Schematics and construction assistance will be available as well as
complete builds once the system has been placed thru its paces.
I extend a special thanks to Kyle for trying this set up out for us! I
eagerly await is operational analysis and
critique.
David Bartsch
Windows Live™ Hotmail®: Celebrate the moment with your favorite sports
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Windows Live™ Hotmail®: Celebrate the moment with your favorite sports pics.
Check
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Windows Live™ Hotmail®: Celebrate the moment with your favorite sports pics.
Check it out.
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