About 2 weeks ago while listening to a broadcastify stream, began to notice on TG 1675 Medevac South and 1677 Medevac North, that intermittently, only the REMCS or the Medevac side of a communication is heard There have been Standby requests from REMCS without any follow-up cancellation or go request heard. Also noticed that during some AM radio checks it starts with both sides of the communication and then goes silent. Does anyone know if there are other frequencies or TGs being used or are they securing the communications?