found a fairly clear and concise
article about how repeaters work

https://www.electronics-notes.com/articles/ham_radio/amateur-repeater/repeaters.php

Thanks, George, KC9UIU for last nights club meeting presentation, helping to shed some better light on amateur radio test equipment and how these pieces of the technology puzzle can help you both hear and put out a better signal.

tnx Steve, N9ZE for the photo