GS-420 ILS Glide Slope Antenna GS-420 Certified 328-336 MHz

Frequency Range: 328-336 MHz
Gain: 10 dBi +
VSWR: 1.2:1 max
Polarization: Horizontal

Description
Spec Sheet

Description

The GS-420 glide slope antenna was designed, tested and certified as part of the new generation and more stable ILS-420 system. The GS-420 antenna contains numerous improvements over existing glide slope antennas.

Improvements Include:
• Extremely stable monitor coupling and phase operation over the environment service conditions, as well as during dipole heater operation.
• Improved sealing of the antenna.
• Improved vibration tolerance, in both transportation and installed conditions.
• Improved dipole design.
• Improved solderability.
• More precise tuning and phase matching of cables.

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