This is a nice online text for those who are new to HF and DXing… – recommended by John, K9KE
http://www.ncdxc.org/misc/K7UA-NewDxersHandbook.pdf
a quick refresher
found a fairly clear and concise
article about how repeaters work
https://www.electronics-notes.com/articles/ham_radio/amateur-repeater/repeaters.php
