123.650 is Phoenix PD's air support division "company" channel. It changed from 123.550 several years ago. When 2 Firebirds are up at the same time, and the pilots want to have an extended conversation, they switch from .025 to here.
And 123.025 was in use long before the TV 5 and TV 15 helicopters collided in mid-air over Steele Indian School Park. It's a nationwide assignment for helicopter air-air use.
John
Peoria