Study of 25 KHz Channel Spacing Implementation in the VHF Air Traffic Control Communications Band for Low Altitude En Route and Terminal Facilities

摘要

The FAA Spectrum Management Branch is responsible for making long range plans for the use of frequencies in the VHF air traffic control communications band (118 - 136 MHz). In February 1972 the decision was made to split channels in this band from 50 kHz to 25 kHz channel spacing. Plans were initially made to implement reduced channel spacing only in the high altitude en route sectors. The first of these assignments was made in June 1977. The purpose of the studies contained in this report was to form the basis of an implementation schedule for low altitude en route and terminal facilities. The effects of the newly proposed Terminal Control Areas as well as the effects of the expected growth in the number of new frequency assignments were studied and results indicated that 25 kHz channel spacing should be implemented in low altitude en route and terminal sectors in 1982 and 1984 respectively. (Author)