Airborne Blade Antenna
400 to 500 MHz
SKU: 21-30-55
The 21-30-55 is a high performance combined UHF airborne blade antenna suitable for helicopters and aircraft operating in excess of Mach 1.
Construction is from a one piece glass loaded thermoplastic 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 21-30-55 to meet the lightning protection requirements of MIL-STD-85670.
Internal radiating element are shaped in such a way as to produce minimum VSWR and also to optimize radiation. The antenna assembly is sealed by closed cell foam and finished in lusterless black or grey urethane paint.
- Covers UHF EPLRS Frequencies
- High Strength Composite Blade with Aluminum Alloy Base Block
- Low Side Area, Low Drag
- Single ‘N’ Type Connector
- Drop-on replacement for AT-256
- Meets Lightning Strike Criteria of MIL-STD-85670
- Environmental Performance to MIL-STD-810
- Foamed in place radiating element
| 21-30-55 | |
| Model # | 21-30-55 |
| Brand | Cooper Antennas |
| Frequency | 400 MHz to 500 MHz |
| Gain | + 2 dBi |
| VSWR |
≤ 2.5:1 (400 - 500 MHz) ≤ 2.0:1 (420 - 450 MHz) |
| Impedance (nominal) | 50 Ohms |
| Power | 100 Watts CW |
| Polarization | Vertical |
| Radiation | Omni directional in azimuth plane |
| Antenna RF Connector | N Female |
| Antenna Shell Type | Glass loaded thermoplastic blade in aluminum alloy base collar |
| Height | 5 inches (127mm) |
| Weight | 0.75 lbs (0.34kg) |
| 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.
