ILS/VOR Antenna

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ILS/VOR Antenna

The 21-20-185 VOR/ILS LOCALISER AND GLIDESLOPE antenna system comprising of a pair of low drag blades (P/N 21-20-185A and 21-20-185B) for horizontal mounting, one on each side of a vertical stabiliser, together with an external cable harness (P/N 21-80-56).

When installed, the blades act as a loop for VOR/LOC and as a forward looking dipole for GLIDESLOPE. The combined output from the 21-80-56 is connected to a diplexer (P/N 21-80-35) which divides the signal into separate VOR/LOC and GLIDESLOPE signals, both of which derive equally from each half of the antenna system.

Mechanical design of each blade comprises an internal printed circuit half loop, foamed-in-place into a glass loaded thermoplastic radome fitted to an aluminum alloy base block having an integral mounting flange.

Aerodynamic lightweight fiberglass blades
Low drag
High ratio between horizontal and vertical polarization
Environmental Design to MIL-STD-810
Loop design for omnidirectional VOR/LOC pattern
Fully sealed for environmental integrity

	21-20-185
Model #	21-20-185
Brand	Cooper Antennas

Frequency	Localiser : 108-118 MHz Glideslope : 328-336 MHz
Gain (typical)	Localiser : -5 dBi Glideslope : -5 dBi (Antennas only, excluding cable harness losses)
VSWR	Localiser : ≤ 5.0:1 Glideslope : ≤ 3.0:1
Impedance (nominal)	50 Ohms
Polarization	Horizontal
Radiation	VOR/Localiser : Omnidirectional Glideslope : Forward looking lobe
System comprises of	Qty 1 - 21-20-185A (Antenna) Qty 1 - 21-20-185B (Antenna) Qty 1 - 21-80-56 (Cable harness) Qty 1 - 21-80-35 (Diplexer)

Construction	Glass loaded thermoplastic moulding with integral aluminum base flange
Height	6 inches (152mm) for single antenna
Weight	1.8 lb (0.8kg) for single antenna 6 lb (2.71kg) for system
Fixing Holes	4 x Ø 0.209 inches (5.3mm) holes, counter sunk 100° Ø 0.413 inches (10.5mm)