[PSUBS-MAILIST] USB thru hull

[Sean T. Stevenson via Personal_Submersibles]

You could connect the connector body / shield to the hull on both sides. The point is just to prevent the cable from picking up any high frequency noise by providing a continuous shield that sinks to ground somehow. On a sub, your hull is "ground". Which USB spec does your camera require? USB 2.0 has a lower data rate and will be less susceptible to noise errors than USB 3.0, for example. I don't like potting multi-conductor cables where there is a leak path within the cable jacket. Break out the conductors to pot, or use a fully water blocked connector.

Sean

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-------- Original Message --------
On Nov 30, 2017, 18:21, Brian Cox via Personal_Submersibles wrote:

> Or imbed shielded wire in epoxy?
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Brian Cox 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: Thu, 30 Nov 2017 17:18:12 -0800
>
> 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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