We still had some of this in university... I remember making terminators consisting of a coax plug and a 100 ohm screw pot, we'd tune it to 50 and then move up

We still had some of this in university... I remember making terminators consisting of a coax plug and a 100 ohm screw pot, we'd tune it to 50 and then move up or down depending on what the guy downstairs shouted about getting pings or not.