It is not a coax, but a multi-wire cable with proprietary connectors on the
ends. You might be able to splice in some cable extensions and recalibrate;
haven't tried it. I bought a 15m cable and sold my 10m on eBay. Good luck!
"Mark" wrote:

I'm installing a Raymarine SL72 radar and will end up about 2 meters
short on the display to radome cable. Rather than use the expensive
Raymarine extensions, I plan to build my own. I assume that the coax
should be 50 ohm, not 75, but I don't know for sure. Anyone know?
Thanks.