[PSUBS-MAILIST] USB thru hull

[Alan via Personal_Submersibles]

Brian,
you got me interested so I googled & found this...
https://maritime.org/doc/cabling/part4.htm
There are diagrams of potting arrangements for coaxial cable.
They attach a wire to the shielding & send that through the potted through
hull fitting, then ground that wire.
Alan

Sent from my iPad

> On 1/12/2017, at 3:37 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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
>> _______________________________________________ Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> _______________________________________________ Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171201/27ddfd65/attachment.html>