17-4D/1

ILS Marker Antenna

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ILS Marker Antenna - 17-4D/1

The 17-4D is intended for airborne reception of ILS Marker signals at 75 MHz. When mounted on the underside of the aircraft, the antenna has maximum response to horizontally polarised signals within a cone having approximately + 45° boundaries. The operating bandwidth for the single frequency reception is sufficient to retain effective function within the degree of de-tuning to be expected from environmental variations.

Specifications

  • Electrical Specs
  • Mechanical Specs
  • Standard Specs

Electrical Specs

Minimum Frequency
75
Maximum Frequency
75
Impedence
50
Return Loss VSWR
< 1.5:1 - 75 MHz
Gain
Not less than 16 dB below that of a half wave dipole at 75 MHz within a cone + 10° perpendicular to the antenna aperture when measured on a 6' circular ground plane (nominal)
Polarization
Horizontal
Radiation Pattern Azimuth
Radiation Pattern Elevation
Peak Power Watts
Average Power Watts

Mechanical Specs

Full Dimensions LxWxH mm
Height Above Base Plate mm
Mass kg
0.95
Connector Type
TNC Female

Standard Specs

Altitude ft
50000
Continuous Operating Temperature Min - C
54
Continuous Operating Temperature Max C
90
Vibration
Lightning
Standards
14043 (2)

Get in touch

Chelton Limited, Marlow
The Chelton Centre
Fourth Avenue
Marlow
Buckinghamshire
SL7 1TF
United Kingdom
CAGE Code: U1907