Dual Output VOR/ILS Antenna System for Mach 2+ Aircraft
108 - 118 MHz and 328 - 336MHz
The 21-20-85-1 VOR/ILS LOCALISER AND GLIDESLOPE antenna system comprising of a pair of high-strength blades (P/N 21-20-85A and 21-20-85B) 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/splitter (P/N 21-80-39) which divides the signal into separate VOR/LOC and GLIDESLOPE signals, both of which derive equally from each half of the antenna system, and then splits each signal in phase and amplitude. The system is thus capable of feeding twin VOR/LOC and Glideslope receivers.
Mechanical design of each blade comprises an internal printed circuit half loop, foamed-in-place into a high strength epoxy-glass radome fitted to an aluminum alloy base block having an integral mounting flange. Structural design ensures high side loading acceptance as required on high speed military aircraft.
Localiser : 108-118 MHz
Glideslope : 328-336 MHz
Localiser : -5 dBi
Glideslope : -5 dBi
(Antennas only, excluding cable harness and diplexer/splitter losses)
Localiser : ≤ 5.0:1
Glideslope : ≤ 3.0:1
|Impedance (nominal)||50 Ohms|
VOR/Localiser : Omnidirectional
Glideslope : Forward looking lobe
|Antenna RF Connector||TNC Female|
|System comprises of||
Qty 1 - 21-20-85A (Antenna)
Qty 1 - 21-20-85B (Antenna)
Qty 1 - 21-80-56 (Cable harness)
Qty 1 - 21-80-39 (Diplexer/Splitter)
|Construction||High strength fiberglass mould|
|Height||6 inches (152mm) for single antenna|
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)|
- Blue Grey
- Other finish options are available.
- Please specify finish required when ordering.