If you are a repeater owner or just like to tinker with commercial equipment you might want to check out the documents here.
Radio Basics For the Newbie
RF projects Antennas, line, cavity, path engineering, etc.
Tower page Under construction in 2020
DC power page for supplies and other goodies
Link Radios page FM'ing a transmitter,receiver notes, COR/AF board, etc.
C.T.C.S.S. (PL) information (such as the Commspec TS-32 decoder)
Digital Page Packet, Computers, Internet, Networking, Firewall and analog telephone
Author's manufacturing Practices and standards
Soldering ideas Small little page
Some 147.20 Details Spokane side
Presentation for repeater operation
Here's some sites that have technical discussions. Some might be redundant, but check them out, as each of us has some slightly different ideas, and it's nice to share.
Repeater builders By Kevin Custer who has more Tech tips ! Excellent Page
Also takes care of the reflector, below.