DatasheetVOR/ILS Antenna System
108 - 118 MHz and 328 - 336MHz
SKU: 21-20-185-1
The 21-20-185-1 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 21-80-39) 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 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
- Feeds Twin VOR/LOC Glideslope Receiver
- Environmental Design to MIL-STD-810
- Loop design for omnidirectional VOR/LOC pattern
- Fully sealed for environmental integrity
| 21-20-185-1 | |
| Model # | 21-20-185-1 |
| 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 and diplexer/ splitter losses) |
| VSWR |
Localiser : ≤ 5.0:1 Glideslope : ≤ 3.0:1 |
| Impedance (nominal) | 50 Ohms |
| Polarization | Horizontal |
| Radiation |
VOR/Localiser : Omnidirectional Glideslope : Forward looking lobe |
| Antenna RF Connector | TNC Female |
| System comprises of |
Qty 1 - 21-20-185A (Antenna) Qty 1 - 21-20-185B (Antenna) Qty 1 - 21-80-56 (Cable harness) Qty 1 - 21-80-39 (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 |
| Fixing Holes | 4 x Ø 0.209 inches (5.3mm) holes, counter sunk 100° Ø 0.413 inches (10.5mm) |
