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The policies of FASMA for coordination constantly evolve and we encourage input from the community regarding them. Our goal is to minimize interference between Co-Channel systems based on methods used for FCC part 90 FB6/8 stations and specified in TIA/EIA Standard TSB-88.
For Co-Channel stations a model built based on field strength from the repeater transmitter shall be used. A “Service Contour” where 50% of locations and 50% of the time at 1.83 meters above ground level (6 feet) an FM signal shall be better than 18 dB SINAD at the receiver. Co-Channel interference is modeled using an “Interference Contour” 50% of locations, 10% of the time the interfering signal will cause no degradation to a receiver station in the Service Contour of a Co-Channel system. In simple terms this means one repeater transmitting in it’s service area will capture all receivers in the face of any other signal.
This doesn’t mean other signals will not be present, and FASMA/FRC encourages PL/DPL use on mobile receivers to prevent these co-channel signals. This ensures your users will only hear your repeater, even at the edges of your coverage area. Simply put, a typical repeater 100km (60mi) away will be blocked out when the local repeater is transmitting, but may still be received on occasion when the local repeater is not transmitting.
More detailed information on coordination policy and science is found in the FASMA Library.