Combined UHF/Data Link Airborne Blade Antenna

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Combined UHF/Data Link Airborne Blade Antenna

The 21-50-17 is a high performance combined UHF/L-Band airborne blade antenna suitable for helicopters and aircraft operating in excess of Mach 2.5

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 21-50-17 to meet the lightning protection requirements of AS-3191/A.

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 Com, EPLRS and Link16 Band
High Strength Composite Blade with Aluminum Alloy Base Block
Low Side Area, Low Drag
Single ‘N’ Type Connector
Footprint replacement for AT-256
Environmental Performance to MIL-STD-810
Foamed in place radiating elements

	21-50-17
Model #	21-50-17
Brand	Cooper Antennas

Frequency	225 MHz - 450 MHz 960 - 1850 MHz
Gain	+1 to +4 dBi (UHF), +1 to +3 dBi (L-band) when mounted at center of an a 4 foot diameter ground plane.
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	100 Watts CW UHF 200 Watts CW, 2KW peak (L-band)
Polarization	Vertical (Horizontal ≤ 10dB)
Radiation Pattern	Nominally Omni directional in azimuth plane
Antenna RF Connector	N Female

Antenna Shell Type	Glass loaded thermoplastic 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 0.2 inch (5.08mm) holes, spot faced Ø 0.43 inches (10.9mm)