47 CFR § 95.1961 - Interference.
(a) When a 218-219 MHz Service system suffers harmful interference within its service area or causes harmful interference to another 218-219 MHz Service system, the licensees of both systems must cooperate and resolve the problem by mutually satisfactory arrangements. If the licensees are unable to do so, the Commission may impose restrictions including, but not limited to, specifying the transmitter power, antenna height or area, duty cycle, or hours of operation for the stations concerned.
(b) The use of any frequency segment (or portion thereof) at a given geographical location may be denied when, in the judgment of the Commission, its use in that location is not in the public interest; the use of a frequency segment (or portion thereof) specified for the 218-219 MHz Service system may be restricted as to specified geographical areas, maximum power, or other operating conditions.
(c) A 218-219 MHz Service licensee must provide a copy of the plan required by § 95.1915 (a) of this part to every TV Channel 13 station whose Grade B predicted contour overlaps the licensed service area for the 218-219 MHz Service system. The 218-219 MHz Service licensee must send the plan to the TV Channel 13 licensee(s) within 10 days from the date the 218-219 MHz Service licensee submits the plan to the Commission, and the 218-219 MHz Service licensee must send updates to this plan to the TV Channel 13 licensee(s) within 10 days from the date that such updates are filed with the Commission pursuant to § 95.1915.
(d) Each 218-219 MHz Service system licensee must provide upon request, and install free of charge, an interference reduction device to any household within a TV Channel 13 station Grade B predicted contour that experiences interference due to a component CTS or RTU.
(e) Each 218-219 MHz Service system licensee must investigate and eliminate harmful interference to television broadcasting and reception, from its component CTSs and RTSs, within 30 days of the time it is notified in writing, by either an affected television station, an affected viewer, or the Commission, of an interference complaint. Should the licensee fail to eliminate the interference within the 30-day period, the CTS(s) or RTU(s) causing the problem(s) must discontinue operation.
(f) The boundary of the 218-219 MHz Service system, as defined in its authorization, is the limit of interference protection for that 218-219 MHz Service system.