A communications system in which a plurality of transmitter and receiver stations, wherein the transmitter stations are co-located in the same geographic area and capable of communication with each other and an improved method of Automatic Transmitter Power Control (ATPC) operation, wherein the method allows only one transmitter to engage in ATPC at a time per channel set and another improved method of ATPC in which there exists at least two co-located transmitters capable of ATPC operation and wherein the transmitters share transmitter ATPC status.