[PSUBS-MAILIST] Sonar thru hull wiring

[Alan via Personal_Submersibles]

Brian,
I did a quick Google on shielded cables & I can't see that they are of
any advantage in our situation. Unless you are running them next to
another cable. Perhaps more of an advantage inside the hull.
Maybe with saltwater being a conductive medium there is more chance of
Electrical interference, but I don't know.
Anyone got any thoughts on this?
Alan


> On 23/06/2019, at 1:05 AM, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alec, that's how I ran my prior transducers, but ...
> 
> As I haven't yet cut through the wiring I don't know for sure, but I suspect it's more than the usual two, hence the question. I'm debating attempting the simplest approach: tie a tight knot in the cable and run it through a 90° elbow, the part facing out being at least 1/2" larger than the thru hull.  I have an extra 1/4" NPT I could use.  Plug the narrow end with epoxy, and top the large end with 2 part hard rubber.  I know Mark does this with his subs, but he dives shallower than I'll be going.
> 
> Hmm ... or maybe a gland tightened around the cable, same deal as above, but embedded the gland base in the 2 part hard rubber. Or maybe a stainless cap tapped for the gland base, and fill with hard rubber from the other end. I used to make canister dive light heads that way, using turned down D cell mag light heads with LED replacement bulbs. Hmm ...
> 
> I can shorten internally and splice correctly.
> 
> Reflections?
> 
> Brian
> 
> 
> 
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