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RE: [PSUBS-MAILIST] Passive sonar
OK, I just went out to the sub and took a look. The cable
has 9 conductors and the penetrator is a 10 conductor, so I do have one
available for a shield. Currently I've got a foot of standard wires coming out
on the inside, wired to the cable that came with the sonar. That cable is coiled
up, so I'm not sure the exact length, but would guess I probably have 10 feet
inside and about the same outside. It would be hard if not impossible, for space
reasons, to solder the original sonar cable to the penetrator directly, although
it would be possible to greatly shorten the leads. The run from penetrator to
instrument could be about 5 feet if I cut the cable. There appears to be no
grounding of the original cable at either the transducer or instrument
end.
What if I find external braid shielding, wrap the whole
inboard cable assmbly in that (including the one foot of plain wires), and
ground to the hull?
thanks
Alec
Alec,
How long of a run do you have from the bulf head connector inside to the
Interphase display? Are you just using the plain wire that came with the
connector or did you solder the other end of the cable internally to the
connector? If I understand you correctly, your whip from your sonar head coming
to the penetrator has numerous sielded twisted pairs inside wraped with the
impregnated mylar tape? Typically that tape is just used to seperate the
conductors in the cable, there would not be a physical connection on the device.
If it was shielding it would typically be a bair wire with the twisted pair or
an actual shield, similar to what you would find in coax at which point there
would be a physical connection. As for as a differant connector, I would not go
that for yet, it sounds like a simple stray ground or ground loop problem. I
have used the Subconn's for years and have pumped everything from HD Video to
Imaging sonar through them with no problem. Every time I h! ave had a problem,
no offence intended, it was something I created.
A couple things to check would be;
The potting where you joined the whips together, you might try a re-due on
the external whip, I would recommened 3M Scotchcast 2130 for the finished
product using a mold our a good shrink tube.
Check your manual on the Interphase and see if the display needs to be tied
to the hull for ground.
Does the problem get worse during a dive? When I was working with the
Deepworker subs in Hawaii we had a problem with condinsation inside the vehicle,
during a dive the condensation would slide down the internal wall and go write
to the penetration plate, causing all kinds of weird s%*t, which of course would
go away when you tryed to diagnose on the surface. Turns out, the connectors
were not water blocked internally. Replaced the connectors, with water blocked
ones, and the problem went away.
Regardless of the fix, keep me posted, sounds like a good bug.
--
Craig Bussel
--------------
Original message --------------
From: "Smyth, Alec"
<Alec.Smyth@compuware.com>
This hits right on one of my unresolved nuisances. I have
an InterphaseVista sonar in my K-250. The product manual has dire
warnings about cutting the cable to the transducer, but I wasn't comfortable
putting the cable through a compression gland into the hull. So I went ahead
and cut it on the basis that I'd rather risk the instrument's performance than
the integrity of the hull. I used a Subconn bulkhead connector,
and had the intention of putting the shielding through the penetrator by
using one of the pins for that purpose. However, I found it impossible to do
because of how the cable was constructed. Each of the conductors had it's own
shielding, but they're incredibly flimsy tin foil thingies that all
unravel and break up. The penetrator itself is not shielded, it's all
plastic besides the pins.
The result is that the depth sounder reading on the
instrument works fine, but the forward looking sonar image does not correspond
to what's actually in the water. It doesn't actually look like electrical
noise on the screen, but I think that's just because the screen refreshes only
periodically. The sonar image looks proper, but it just isn't what's out
in front of the sub.
Any suggestions would be most welcome. Perhaps a
different kind of penetrator?
thanks,
Alec
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Steve,
If you are looking for a simple gland, as long as your cable is water
blocked, you can purchase stainless steal ones from McMaster-Carr. I have used
the ones from McMaster on pressure balanced oil-filled (PBOF) housings
down to 1000 meters. The cable has to be water blocked though. You can
purchase water blocked cable from Impules, Subconn, our any connector
manufacture. Falmat cable company makes the water blocked umbilcals for
numerous ROV companies, they might have some in stock to purchase a short
piece.
If your gland in coming directly into your sub, I would recommend a bulk
head connector, unless they are pressure compensated, most will leak at or
below 80 psi.
Hope this helps,
--
Craig Bussel
--------------
Original message --------------
From: "Stephen Pearce"
<sjpearceqld@bigpond.com>
G-day
everyone
Does
anyone one in the group have any information on what type of through hull
glands are used for video coaxial and power cables like those used on ROV?s
or maybe subs owned buy group members?
Are
there any good suppliers that any members know about?
Any
help will be appreciated!
Regards
Steve
Pearce
-----Original
Message-----
From: David
Bartsch [mailto:dbartsch2236@hotmail.com]
Sent: Tuesday, 18 September 2007 8:34
AM
To:
sjpearceqld@bigpond.com
Subject: FW: [PSUBS-MAILIST] Passive
sonar
> Date: Mon, 17 Sep
2007 09:38:22 -0700
> From: ronleonard@shaw.ca
> Subject: RE:
[PSUBS-MAILIST] Passive sonar
> To:
personal_submersibles@psubs.org
>
> Try these:
>
>
http://www.ancorproducts.com/scpt/SectionPage.php?loadSubs=Ancor_WIRE%20MANA
>
GEMENT%20PRODUCTS_WIRE%20SEALS
>
> Good to 300'
>
> Ron
>
> -----Original Message-----
> From:
owner-personal_submersibles@psubs.org
>
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
> Sent: Monday, September 17, 2007 6:18 AM
> To:
personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Passive
sonar
>
> Peter,
>
> I have reestablished the omni
dirrectional option to the sonar. It was ! !
& gt; ; one of those
very simple problems that was so easy to solve, I could not see
>
> the answer.
>
>
>
> David
Bartsch
> P.S.: The flooding took place at the point in which the
hydrophone interface
>
> cable entered the hydrophone. We will
be patient and give Stephen some time
> to work it over and hopefully
redesign it.
>
>
> >From: "David Bartsch"
<dbartsch2236@hotmail.com>
> >Reply-To:
personal_submersibles@psubs.org
> >To:
personal_submersibles@psubs.org
> >Subject: Re: [PSUBS-MAILIST]
Passive sonar
> >Date: Mon, 17 Sep 2007 08:15:28 -0400
>
>
> >Peter,
> >
> > Stephen Pearce is working
on an upgrade to the hydrophones...It is only
> >good now to 40
FSW! He tested it in a pressure tank and it started flooding
>
> >at 18psi. Good to know thow.
> >
> >
>
>! ; > David Bartsch
> >
> >
>
>
> >
> >>From: "Peter Madsen"
<peter@submarines.dk>
> >>Reply-To:
personal_submersibles@psubs.org
> >>To:
<personal_submersibles@psubs.org>
> >>Subject: Re:
[PSUBS-MAILIST] Passive sonar
> >>Date: Mon, 17 Sep 2007
09:35:51 +0200
> >>
> >>
> >>Hi,
>
>>
> >>I really hope for your sucses !
>
>>
> >>Peter Madsen / UC-3 Nautilus
>
>>
> >>----- Original Message ----- From: "David Bartsch"
> >><dbartsch2236@hotmail.com>
> >>To:
<personal_submersibles@psubs.org>
> >>Sent: Monday,
September 17, 2007 5:57 AM
> >>Subject: [PSUBS-MAILIST] Passive
sonar
> >>
> >>
> >>>PSUBS,
>
>>>
> >>> The passive sonar I have been ! working !
on for so long is completed! The
>
> >>>omni
dirrectional mode was ommitted as problems existed with this mode on
>
> >>>initiall installation.
> >>> Testing
aboard a small pleasure craft will be conducted during the
>
>>>Spring of 2008. Although trainable search mode is operational, I
must
> >>>determine the exact cone of geographical coverage
of each hydrophone so
> >>>as to avoid "gaps" of contact
detections between hydrophones.
> >>> In shop testing proved
very good with the selected hydrophones
> >>>"active" once
selected.
> >>> The premp/amp console has "extra" jack inputs
for cavitation and
> >>>other own ship noise monitoring
purposes.
> >>> We are on our way!
>
>>>
> >>>
> >>>David Bartsch
>
>>>
> >>>_________! _______ _! _______
_________________________________________
> >>>Gear up for
Halo® 3 with free downloads and an exclusive offer.
>
>>>http://gethalo3gear.com?ocid=SeptemberWLHalo3_MSNHMTxt_1
>
>>>
> >>>
> >>>
>
>>>
>
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>
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>
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