From one to four channels are assigned in a particular area. Service is used on private aircraft. Channels are spaced 6 kHz apart. A specific block of 29 channels is assigned to each geographical area. Ground frequencies are 45 MHz lower and do not echo the airborne half of the conversation.
Service is used on passenger airlines.
Each TV channel is 6 MHz wide. The video carrier is 1.25 MHz above the start of the range. The audio carrier is 0.25 MHz below the end of the range. 120 - 174 Mid band Ch. The FRS was adopted on 10 May 96 and will be authorized by July 96.