GS-2/3/4 ILS Glide Slope Antenna Array 328-336 MHz

Frequency Range: 328-336 MHz
Gain: 10 dBi
VSWR: 1.2:1 max
Polarization: Horizontal
Model Number: GS-2/3/4
Part Number(s): 1000-0579-202, 1000-0582-502, 1500-0149-203, 1000-0579-203, 1000-0579-204
NSN: 5985-01-048-0147

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Description
Spec Sheet

Description

Applications:

Glide Slope Antennas are used to provide vertical guidance to aircraft during approach and landing of an aircraft under instrument fight rules.

Features:

The Glides Slope Antennas are designed to withstand 100 mph wind, 1⁄2-inch radial ice, temperature range of -50oC to 70°C, and 100% humidity. All elements are equipped with de-icing heaters and thermostats.

Characteristics:

Glide Slope Antennas operate on a frequency of 328 to 336 MHz on a nominal impedance of 50 Ohms and power up to 50 watts. A null reference glide slope antenna system is fed by two transmitters, one on the carrier frequency and the other on sideband frequency. A capture effect glide slope antenna is fed by an additional clearance transmitter. (Refer to FAA Handbook 6750.6 for more information on null reference and capture effect systems.) A null reference glide slope antenna system consists of two antenna arrays, an external RF network, and a 40-foot tower equipped with safety climbing rail and obstruction marking and lighting. A capture effect system is a null reference system plus an additional antenna array, 20 feet of tower and a clearance cancellation bridge.

Part Number & Description:

1000-0579-201/202/203	Glide Slope Antenna
1000-0578-203	Mounting Frame
1000-0563-201	40’ Tower Kit
1000-0563-202	60’ Tower Kit

Spec Sheet

SPECIFICATIONS	PERFORMANCE
Frequency Range	328-336 MHz
Impedence	50 Ohms
RF Power	50 Watts CW
Monitor Coupling	-6 to -10 db over 328-336 MHz
Polarization	Hoizontal
Cross Polarization	At least -25 dB as measured in front of the antenna and within +/- 25 degrees in azimuth of a vertical plane perpendicular to the reflector and passing through the center of the antenna array
Front-To-Back Ration	More than 16 db
VSWR	1.2:1 Max over 328-336 MHz
Gain	More than 10 dBi
Horizontal Radiation Pattern	Between the upper and lower limit lines as shown in following table
Vertical Radiation Pattern	Symmetrical around 0 degrees elevation and decreasing smoothly in amplitude in either direction from 0 degrees elevation.
Dipole Phase	Left and right dipoles with 20-30 degrees phase of center dipole
Monitor Stability Signal Level	Constant within +/- 0.2 dB over the service condition range; track other antennas within 0.15 dB.
Monitor Amplitude Stability Test	Max change from baseline is +/- 0.075 dB when heaters are energized.
Phase Stability Test	Max change from baseline is +1.1 degrees, -0.4 degrees when heaters are energized.
Dipole Heaters	Yes