scope:

The equipment specified herein is a non-image, low profile, End-Fire Glide Slope (EFGS) Antenna System operating in the band of 329 to 335 MHz. This antenna system interfaces with a two frequency glide slope station, not furnished under this specification, which provides course and clearance antenna drive signals and monitor signal processing and control. The main array driven by the course transmitter provides precise vertical guidance (fly-up and fly-down about nominal path) throughout an azimuth of at least 14 degrees. The clearance array driven by the clearance transmitter provides clearance (150 HZ fly-up only) signal beyond the precise sector to plus or minus 40 degrees of azimuth. The course and clearance antenna arrays incorporate monitor systems capable of system shutdown should out-of-tolerance degradation occur.