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Old 06-10-2017, 23:39   #1
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Simnet cable splicing

A few years ago I fitted a Simrad IS20 wind instrument and masthead sender, foolishly connecting the two with a single 30 metre simnet cable. Now that I am looking at pulling out the mast again I would ideally like to cut this cable and rejoin it when the mast goes back in, either by splicing directly or by cutting in half a 300mm cable I have and splicing those ends onto the bare ends created by cutting the 30m cable. Would then use the simple male/male cylindrical simnet joiner.
I could also un-run the cable from the mast back to the instrument; leave it coiled in a locker abaft the mast and buy another 10 metre cable and joiner to run back to the instrument.
Any ideas what might work or not?
Thanks
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Old 07-10-2017, 00:19   #2
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Re: Simnet cable splicing

I would cut it and get 2 nmea 2000 field ends. Male / female. To rejoin.

I have never seen simnet ends. Maybe they exist. Same cable though. N2k connectors will work.
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Old 07-10-2017, 04:35   #3
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Re: Simnet cable splicing

These days Simnet is essentially the same as N2K. You can splice, but adding connectors would be battery and more flexible in the future.
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Old 07-10-2017, 05:05   #4
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Re: Simnet cable splicing

Some comparisons of Simnet and NMEA2k cable.

As per the other comments, cutting and installing a connector pair seems the best idea. Field-installable NMEA2k connectors would work.

If you have time to experiment, you could also try connectors like this or this.
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Old 07-10-2017, 05:51   #5
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Re: Simnet cable splicing

You can't beat the simnet plug when it comes to fitting it through tiny openings. Makes it much better than the clunky field connector. I think most of the simnet cables on my boat have been "cut and shut". Never had a problem. Just take care to ensure the connection is watertight and reasonably protected in service. I use dual wall heat shrink for the job. if I planned to remove the mast occasionally (and didn't have a Swan neck gland), I'd just make the lead a bit longer and use waterproof joiners that are quick and easy to replace.
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Old 07-10-2017, 10:15   #6
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Re: Simnet cable splicing

The simnet connectors are certainly low profile, but they a friction fit and have been known to pull out of their sockets.
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Old 07-10-2017, 14:07   #7
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Re: Simnet cable splicing

Thanks for all the comments; great forum.
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