What must the control operator of a repeater operating in the 70-centimeter band do if a radiolocation system experiences interference from that repeater?

In the 70-centimeter band (420-450 MHz), amateur radio operators hold secondary status, while military radiolocation (radar) systems hold primary status. This means amateur stations must not cause harmful interference to primary users and must accept any interference received from them. If a repeater causes interference to a radiolocation system, the amateur control operator is legally obligated to resolve the issue immediately. This involves either ceasing operation completely or making technical modifications to mitigate the interference. Options involving FAA NOTAMs or simply reducing HAAT without ensuring full mitigation are insufficient or irrelevant to resolving secondary user interference.