Air to Ground Telephone [22.521]
Ch Ground Airborne
Signaling 454.675 (459.675)
6 454.700 459.700
7 454.725 459.725
5 454.750 459.750
8 454.775 459.775
4 454.800 459.800
9 454.825 459.825
3 454.850 459.850
10 454.875 459.875
2 454.900 459.900
11 454.925 459.925
1 454.950 459.950
12 454.975 459.975
Transmissions are FM. Ground stations repeat the airborne
half of the conversation, and transmit a continuous tone when
idle. From one to four channels are assigned in a particular
area.
Service is used on private aircraft.