I’m working on a project involving antenna installations on a navy ship. The specifications call for using triaxial antenna cable, i.e. coaxial cable with two separate AND insulated shields.
I’ve done a lot of antenna installations in many sorts of environments and normally I use double braided cable like RG-214 or foil+braid cable. This normally satisfies all requirements for shielding as foil+braid cable has a shielding efficiency of around -90dB.
I’ve been searching the internet for more knowledge, and I’ve found some manufacturers like Times that makes triaxial cable and others like Trompeter and King that makes connectors.
The cable specs are not so impressive, they seem to be equivalent to the foil and braid double shielded coax. The pricing is however very impressive
. Also the connectors look very expensive.
So what are the true benefits of using triax for HF and VHF shipborne antennas? Has it got something to do with EMP protection levels?
I would appreciate any input on this from someone more knowledgeable then I.