[PSUBS-MAILIST] USB thru hull

Thu Nov 30 22:49:38 EST 2017

Just another thought. You could use standard off the shelf cables run through suitably sized armoured hose, pipe, or tubing, with a standard non locking (friction fit) connector positioned in-line just beyond the hull, and run it through a generously sized ball valve just inside the hull for emergency isolation. The cable could be potted in beyond the in-line connector to limit water ingress in the event of a failure, and then if you do spring a leak, just yank the inner cable out and isolate.

Sean

Sent from ProtonMail mobile

-------- Original Message --------
On Nov 30, 2017, 20:39, Sean T. Stevenson via Personal_Submersibles wrote:

> HDMI is going to be tougher. Four shielded twisted pairs (+ other conductors) with 100 ohm characteristic impedance. Your talking about hundreds of MHz data rates. Finding a through hull / connector that doesn't induce reflections is going to be difficult. You'll need low loss RF quality connections.
>
> Sean
>
> Sent from ProtonMail mobile
>
> -------- Original Message --------
> On Nov 30, 2017, 19:59, Brian Cox via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>
>> Alan,     That was my thought and fear exactly !    I'm probably over thinking this as I usually do.  I will probably be wanting to do the same thing to an HDMI cable.
>>
>> Brian
>>
>> --- personal_submersibles at psubs.org wrote:
>>
>> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] USB thru hull
>> Date: Fri, 1 Dec 2017 15:37:14 +1300
>> Brian,
>> can you find a cross sectional diagram of the wire you are talking about?
>> Have attached one I found on line as an example. Looks a nightmare to pot.
>> This item has a plastic jacket & could be put in a compression fitting,
>> however I would do what Carsten & Emile have done & put a blue globe
>> fitting on the inside of the hull as well as the outside.
>> My only reservation about this is that depending on how the wires etc are
>> arranged inside the jacket, it could compress unevenly. You could try & fill
>> the area of the cable that is inside the compression fitting with expoxy by
>> cutting into the jacket & shielding & squirting a low viscosity epoxy in there.
>> Alan
>>
>> [image1.JPG]
>>
>> Sent from my iPad
>>
>> On 1/12/2017, at 2:28 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>> Sean,   I'm using and squeeze fitting now for a co-ax line that is good for 600 ft, but there is a plastic core in there that the squeeze fitting can press against,  with regular wire it seems like water might try to migrate through.
>>>
>>> Brian
>>>
>>> --- personal_submersibles at psubs.org wrote:
>>>
>>> From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
>>> To: personal_submersibles at psubs.org
>>> Subject: Re: [PSUBS-MAILIST] USB thru hull
>>> Date: Thu, 30 Nov 2017 20:21:23 -0500
>>>
>>> No, I meant that the shield should be contiguous from start to end, regardless of how many connectors are in line.
>>>
>>> Sean
>>>
>>> Sent from ProtonMail mobile
>>>
>>> -------- Original Message --------
>>> On Nov 30, 2017, 18:18, Brian Cox via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>>>
>>>> Sean,    So not necessary to have the wire shielded through the short thru hull area?
>>>>
>>>> Brian
>>>>
>>>> --- personal_submersibles at psubs.org wrote:
>>>>
>>>> From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
>>>> To: personal_submersibles at psubs.org
>>>> Subject: Re: [PSUBS-MAILIST] USB thru hull
>>>> Date: Thu, 30 Nov 2017 20:12:22 -0500
>>>>
>>>> Yup. +5V, data+, data-, and ground. Any 4 pin connector should work, but to avoid noise issues you'll probably want to use twisted pair shielded wire, carry the shield through the connector, and depending on the total length of the cable run, 28 to 20 AWG wire (0.81m to 5m length, according to USB 2.0 spec).
>>>>
>>>> Sean
>>>>
>>>> Sent from ProtonMail mobile
>>>>
>>>> -------- Original Message --------
>>>> On Nov 30, 2017, 18:03, Brian Cox via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>>>>
>>>>> Hi All,
>>>>>                Has any one ran usb cable thru the hull and out to a camera or other device?  I think it's just 4 wires.
>>>>>
>>>>> Brian
>>>>
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>>>
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