VHF Airborne Blade Antenna
70 to 80 MHz
SKU: 21-20-75
The 21-20-75 is a high performance VHF receive only airborne blade antenna suitable for use on fixed and rotary wing aircraft.
Construction is from a one piece fiberglass blade molding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to the airframe via 6 fixing holes drilled to the same pattern as the AT-256 UHF antenna.
The metal base block also enables the 21-20-75 to meet the lightning protection requirements of AS-3191/A.
Internal matching elements produce minimum VSWR and enable close phase/amplitude matching making these antennas suitable for use in homing and DF systems. The antenna assembly is sealed by closed cell foam and finished in lusterless black paint.
| 21-20-75 | |
| Model # | 21-20-75 |
| Brand | Cooper Antennas |
| Frequency | 70 MHz to 80 MHz |
| Gain (typical) | -20 dBi |
| VSWR | ≤ 2.0:1 |
| Impedance (nominal) | 50 Ohms |
| Power | 1 Watts |
| Polarization | Vertical (when mounted vertically) |
| Radiation | Omni directional in azimuth plane Elevation - see graph |
| Antenna RF Connector | N Female |
| Construction | Epoxy/fiberglass blade in aluminum alloy base collar |
| Height | 9 inches (229mm) |
| Weight | 0.9 lbs (0.4kg) |
| Side Loading | ≥ 8 psi ultimate |
| Base Plate Shape | Diamond shape |
| Fixing Holes | 6 x Ø 0.203 inch (5.2mm) holes, counter bored Ø 0.43 inches (10.9mm) |
Finish
- Urethane Lusterless Black
- Other finish options are available.
- Please specify finish required when ordering.
