W9CR info site
This is a small collection of stuff about hacking various radios. Right now it's mostly about the Quantar series of radios.
I expect to have some info on the AstroTac receiver as well.
There is some information on the Uniden MRS904 repeater converting it for amateur use.
Motorola HT1250ls 220 modifications.
Hamtronics 220 repeater notes