Assigning repeater frequencies is analogous to playing a chess game ... the frequency coordinator has to be sure that each repeater he or she assigns to repeater pair xyz isn't going to conflict with others on the same pair within x-number of miles, or on adjacent frequencies. So what is the life like for these major players in this VHF/UHF game of chess? Just ask unpaid coordinator Aaron Collins/N9OBZ. Aaron and the Illinois Repeater Association play referees in their attempts to maintain law and order among the 500-plus VHF/UHF repeaters in Illinois. As RAIN's Hap Holly/KC9RP learned, a good deal of Aaron's job is rather mundane in his Arlington Heights home.