Marine Electronics Forum - Cutting Radar Cable - Furuno NavNet 1933C

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reeldeep22
03-26-2012, 08:33 AM
Hi all,

I have relocated my 10.4" Furuno NavNet 1933C to my hard top because I purchased another GPS for reduncy. As a result of this move I will have approximately 20' of open array radar cable that I cannot find a place for. My hard top is not accessible and is filled with coring material. Can I cut this cable and resplice the connections? And, will I need to re-calilbrate the radar and is this an easy operation? Thanks!


reeldeep22
03-26-2012, 05:51 PM
Any thoughts? Desperate and need guidance........Thanks!

mstyle8517
03-26-2012, 06:09 PM
You should have at least 5m of cable for proper radar operation. So, assuming you have a 10m cable, yes, you can take 20' off of it. Your best bet would be to pull as much excess cable as you want to cut through the open array radar itself, leaving about enough extra to reach the board for all the plugs. Then you can cut the cable and use Japan Solderless Terminals to make the plugs - those are the little metal clip/pin looking things going into the white plastic plugs. Use an interconnect diagram on your unit, usually in the back of the install manual, and the little numbers molded into the white plastic plugs to figure out which wires go where. There are two sizes of the terminals you will need, Furuno tech support should be able to supply p/n's. This is a PITA to do on a workbench, let alone a hard top - if you have any way of coiling the 20' or so of cable inside the hardtop - DO IT!


reeldeep22
03-26-2012, 06:27 PM
Max, thank you! I have very little space and cannot find any room to coil up the 30' coil. I need to cut it and am thinking I could hide 15'. So, if you think 15' will be ok thats great. Also, is it better to splice or reconnect the pins? Do I need to recalibrate the radar after shortening? Thanks!

mstyle8517
03-27-2012, 06:32 AM
I've always been partial to the pin method as in the business of reselling used pulls, which is a big chunk of what we do, bringing the radar back to "stock" specs is always the most desirable.

However, I see nothing wrong with leaving a 12 inches of wire on the connectors and splicing them together with solder and heat shrink tubing. However, where it gets interesting is with the coaxial video cable. If I've got to splice a cable that was cut so far down the cable that I need to splice the two pieces together, on the video cable, I'll solder the center conductor, heat shink 2x or teflon and heat shrink around it, then solder the outer shield, and heat shrink that. It takes some creative thinking to "line up" the heat shink tube on the cable so that you can perform the splice correctly. The other wires, however, should be pretty straight forward. If we were in the business of installation, which we are not, I would go with the pin method on a customer's boat, but if I needed to do this on my own boat and didn't want to deal with ordering pins, etc., I would probably go ahead and splice away.

reeldeep22
03-27-2012, 08:14 AM
Has anyone else done this? I just got off the phone with Furuno technical support and they said absolutely not, do not cut the cable. The radar will be junk and will not function. The head unit cannot be timed or recalibrated. I dont want to question them but it doesnt seem right......

CMEBoston
03-27-2012, 08:18 AM
I have done it, its the only way to go with a sailboat that has a radar on the mast.

mstyle8517
03-27-2012, 08:27 AM
Timing can be adjusted, the procedure is outlined in the installation manual. Any manufacturer will tell you not to cut the cable...

nsh
03-27-2012, 08:45 AM
I always understood that shorting the cable for radar was a no-no. ???????

reeldeep22
03-27-2012, 08:58 AM
I can understand splicing the cable would be ok but shortening it from 30' to ~10'?

PtJudeRI
03-27-2012, 09:07 AM
Coil it up in the console... Better to not mess with it.

reeldeep22
03-27-2012, 09:18 AM
I wish I could coil it up. There is zero room unless I core out the resin materials in my hardtop. I could fit a foot or two in my navpod and maybe another foot or two in my open array but I cant find any space for the other 20'+



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