Of some coaxial cables. Back in the 90s I just accepted every terminator was 50hz, and the only coax I really dealt with was ethernet. In the 00s I got into television and almost every terminator was 75Hz, with 50hz being specially marked.
I can't remember the last time I saw a terminator. I still deal with plenty of coax, but it's from one piece of active equipment to another and they self terminate.
(thinking about it I do see some specialised terminators on N type connectors on spectrum analysers, but I don't really do satellite so never deal with them)
I was just using the 50 Hz as an example of something that was chosen pretty arbitrarily. I always thought the 50 Ohm was also chosen like that. I had no idea there were serious technical considerations in choosing it.
I should have written 50 Ohm, not Hz in the first sentence of my post though, that was a mixup. But I'm very aware of it.
