After having someone at a BBQ ask me to explain what a repeater is for about the 30th time in my life, I decided that I may as well record my standard 10 minute talk on what a repeater does.
Introduction to Radio Repeaters:
Of course, once I've got the camera turned on, why not record another 20 minutes on the internals of a repeater?
Internals of a Repeater:
I suspect there are a few more videos in this series, which I'm currently working on and will record time-permitting.