Broadband Airborne Blade Antenna

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Broadband Airborne Blade Antenna

The 21-50-91/92/93 are vertically polarized, omni-directional antennas, compatible with all popular airborne radios operating within the 30 to 400 MHz frequency range. These antennas can handle 100 Watts of power and require no external tuning.

These wideband, multi-function antennas developed by Cooper Antennas Ltd are particularly suited to tactical military communications. Rugged design ensures reliability in world wide conditions of service on aircraft operating at speeds up to Mach 1.0.

Use of a surface deposited radiating element optimizes efficiency. The element is DC grounded for lightning protection.

High Strength Broadband Blade Antenna
Frequency Selective Matching Network
Fully Foamed to Provide High Environmental Integrity
Aluminum Alloy Retaining Collar Accepts High Side Loading
Designed to AS-3191/A & AS-3793/A (MIL -DTL-85670B) Specification
Drop-on Replacement for AT-1108
Suitable for AN/ARC-182, AN/ARC-186 and Similar Multi-Mode Radios
Complies with MIL-STD-810
21-50-91 - NSN 5985-01-554-7183
Meets Requirements of 5985-01-121-6315, 5985-01-321-6182 5985-01-081-0222 & 5985-01-316-8084

	21-50-91
Model #	21-50-91
Brand	Cooper Antennas

Frequency	30 - 88 MHz, 108 - 174 MHz 225 - 400 MHz
Gain	30 MHz ≥ -22.5 dBi 88 MHz ≥ -11.0 dBi 108 MHz ≥ -8.0 dBi 130 MHz ≥ -2.5 dBi 174 MHz ≥ 0 dBi 225 MHz ≥ +2.5 dBi 300 MHz ≥ +4.0 dBi 400 MHz ≥ +3.0 dBi
VSWR	≤ 2.5:1 30 - 88 MHz & 108 - 118 MHz ≤ 2.0:1 118 - 174 MHz & 225 - 400 MHz
Impedance (nominal)	50 Ohms for both ports
Power	50 Watts CW 30 - 88 MHz & 118 - 174 MHz 100 Watts CW 225 - 400 MHz
Polarization	Vertical
Radiation	Azimuth : Omni-directional Elevation : As stub
Antenna RF Connector	TNC Female

Antenna Shell Type	High density foam filled epoxy/fiber glass shell set in aluminum alloy base collar
Height	14.65 inches (372mm) max
Weight	3.5 lbs (1.6kg)
Side Loading	≥ 8 psi ultimate
Base Plate Shape	Tear drop
Fixing Holes	6 x Ø 0.234 inches (5.9mm) holes, counter bored top side Ø 0.39 inches (9.9mm)