Peter Crosland wrote:

You cannot just join it electrically, the impedance must be maintained. You
could fit connectors and then seal it all with self-amalgamating tape.
Unless it is a very long run the best solution is to replace the cable. If
it is more than five years old it is probable that it will have deteriorated
enough to reduce the signal significantly.


True if pedantically interpreted, but untrue in practice.

To join coax the procvess is as fillows.

First of all stribp backl the outer insulation, then fold back the
braiding and get it out of the way to expoose the inner isnulation.

Strip about half an inch of that on each cable.

Now slip some BIG heatshrink tubin over one of the cables outers, and
another smaller diameter bit over the inner insulators.

Solder the inner conductors together by laying them parallel and
flooding with solder.

Pull the heatshrink over the inner and seal down with ahirdryer/heta gun
etc.

Thats teh conductor done, and insulated

Now pull the braids together and just solder em someohow to make a
connection. needent't be perfect.

Now get some aluminium foil and wrap teh lot with a thin layer of that.
Don't try and solder it. It won't.

Silde the big heatshrink tubing over he joint, slap some silicone sealer
or epoxy resin inside and seal with heatgun.

If you are really worried about corrosion, wrap the whole thing in a few
layes of cloth soaked in silicone

VSWR won't be exactly 1, but will be better than most plugs and sockets :-)