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
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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 |
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