The Natural Philosopher wrote:
Steve wrote:


Very good.

Just to add that 50 Ohm cable is used, almost exclusively, in radio
communications and this is its main use.

Steve

Odd. I have only ever uses 50 ohm cable around the lab. Or for Ethernet.
All anteannae are fed via 75ohm cable, as this matches the natural
impedance of a dipole.

Maybe I should have made that clearer and said commercial radio
communications. 50 ohm is the industry standard.

All my aerials (yagis) were fed with 50 ohm coax 7/8" & 1/2" Heliax
before I moved, but often, as you say, people do use 75 ohm for things
like dipoles but rarely in the commercial world.

Steve