Coaxial cable can come in different sizes, somewhat related to how strong the signal you want to carry is. First time I was in a TV transmitter I saw a lot of copper pipes running across the ceiling, maybe 6 inches (15 cm) in diameter. I asked what the pipes were for and was told they weren’t pipes, they were coaxial cables. Turns out when you need to carry 30,000 watts of RF the cable needs to get a little bigger. Still 75 ohms resistance!
Coaxial cable can come in different sizes, somewhat related to how strong the signal you want to carry is. First time I was in a TV transmitter I saw a lot of copper pipes running across the ceiling, maybe 6 inches (15 cm) in diameter. I asked what the pipes were for and was told they weren’t pipes, they were coaxial cables. Turns out when you need to carry 30,000 watts of RF the cable needs to get a little bigger. Still 75 ohms resistance!