Sounds simple, maybe I'm just trying to make hard work for myself. I need to extend a coax cable by about 20m. The cable is RG-213/U. By what I have gathered from google this is favoured by radio hams although my app is different. To make life easier, the cable that I need to extend has really oddball end fittings which are of the crimped on (non-removable) type with screw-on terminations. Just to make it interesting these fittings are left hand thread and I think they could be Outer Mongolian Gas Thread. I can find the cable required to make the extension but cannot find any suitable hardware to join a middle bit to the 2 ends. The whole has to be weatherproof but I can do this with suitable enclosures if req'd. Any ideas please.
DBF