Eiron wrote:


It's about the same diameter (3.1mm) as cheap audio co-ax and has a
conductive layer with drain cable, so nice and easy to fit connectors to.

Not really coax though, is it?


** No - just two parallel conductors and so would not give the magnetic field rejection of co-axial construction.


What's the conductivity of the black layer?


** Not great, but works well in conjunction with the drain wire as a shield against mains voltage hum and noise.

An overall braid would be better in all respects.


..... Phil