Source for 22 gauge, 12 Conductor Cable

[scherzoja]

I'm reinstalling my W-H Autopilot after a refit and need to extend one of the cables, but can't find a source that will sell only 50 feet. AP model is P-3C.

The cable that is too short is the one that runs from the Pilot House Control box (PHC) to the Headings Electronic Box (HEB). This cable is made of a pair of cables composed of twelve 22 gauge conductors in a shielded sheath (22/12C SHIELDED CMR-CL2R).

This cable bundle is hardwired into the PHC and terminated on the loose end into a single DB25 male connector. My goal is to build a 20' extension cable with a male DB25 on one end and female DB25 on the other end. This should reach between the new locations of the PHC and HEB.

The problem I am encountering is that I can't find any source what sells fewer than 250' or 500' reels. I only need 50' total.

I have found some sources with reasonable prices on cut-to-length of 24/12, but I don't know if 24 gauge is large enough. Nothing in documentation regarding amps sent through this specific cable, so I can't calculate voltage drop/ampacity.

Does anyone know where I can buy 50' of 22/12 shielded CMR or if 24 gauge will be adequate for this? From what I can tell, there is just signal communication between PHC and HEB, so smaller gauge might be OK.

An alternative is to buy a pre-made serial cable like this one, but I don't know the wire gauge of each conductor.
25ft. DB25 Male to Female MLD Cable ZT1232190 at Ziotek.com


Thanks

[dlj]

Did you try contacting Ziotek and ask about what the gauge of the conductors are in that cable?

dj

[scherzoja]

Not yet, it's the weekend, they're not open. I'll check on Monday.