108 - 118 MHz and 328 - 336MHz
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
Localiser : 108-118 MHz
Glideslope : 328-336 MHz
Localiser : -5 dBi
Glideslope : -5 dBi
(Antennas only, excluding cable harness losses)
Localiser : ≤ 5.0:1
Glideslope : ≤ 3.0:1
|Impedance (nominal)||50 Ohms|
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)|
- Urethane Lusterless Black
- Other finish options are available.
- Please specify finish required when ordering.