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Multi-function VHF/UHF LOS/Satcom & L-Band Antenna

30 to 600 MHz, 240 to 400 MHz & 960 to 1220 MHz

SKU: 21-50-74

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Multi-function VHF/UHF LOS/Satcom & L-Band Antenna

The 21-50-74 is a rugged, multifunction VHF/UHF LOS, UHF Satcom and L-Band antenna designed for airborne applications. A high strength aerodynamic vertical shell houses a 30 to 600 MHz linear element that can be used for VHF/ UHF line of sight “LOS” communications or UHF Satcom at low angles of elevation as well as TACAN/IFF/LINK16 (L-band). This vertical shell also supports a “Bat-Wing” shape horizontal element containing a pair of cross dipoles, connected to provide high angle, right hand circularly polarized UHF Satcom coverage.

The antenna is completely sealed and filled with closed cell foam for long term environmental protection and reliability. Internal filtering allows the antenna to operate simultaneously with Satcom or LOS and L-band 

  • Hi angle UHF Satcom & MUOS coverage
  • Lo Angle VHF/UHF LOS communications
  • Isolated Outputs
  • EPLRS compatible
  • Suitable for TACAN/IFF/LINK 16
  • Low wingspan minimizes loading on aircraft structure
  • Fixing holes compatible with 437S1-H
  • Designed to MIL-STD-810 Environmental Requirements
  • Erosion protection over all leading edge surfaces
21-50-74
Model # 21-50-74
Brand Cooper Antennas
Frequency

UHF Hi Angle : 240 - 400 MHz

VHF/UHF Lo Angle : 30 - 600 MHz

L-Band : 960 to 1220 MHz

Gain (typical)

Hi Angle

Lo Angle

 

 

 

 +6.5 dBiC

30-88 MHz -18.5 dBi to - 8 dBi

108-174 MHz -1 dBi average

225-600 MHz +1 dBi average

960-1220 MHz +1 dBi average 

VSWR

Hi Angle

Lo Angle VHF/UHF

L-Band

≤ 2.0:1 

≤ 2.5:1 

≤ 2.0:1 

Impedance (nominal) 50 Ohms for all ports 
Power

Hi Angle

Lo Angle VHF/UHF

L-Band

50 Watts CW

200 Watts CW (LOS and Satcom)

2 KW Peak, 200 Watts CW 

Isolation

VHF/UHF to L-band : 40 dB min

L-band to Satcom : 30 dB min

Note : depending upon system architecture, it may be necessary to provide increased isolation for simultaneous operation which can be adhered by 2 x 21-80-04-1 Low pass and 1 x 21-80-03-1 High pass external, in-line filters - see separate datasheets 

Polarization

UHF Hi Angle

VHF/UHF Lo Angle and L-Band 

Right Hand Circular 

Vertical

Antenna RF Connector

UHF Hi Angle

UHF Lo Angle

L-Band

N Female

TNC Female

N Female 

Height 12 inches (305mm) 
Wingspan 13 inches (330mm) max 
Weight 9.7lbs (4.4Kg)
Fixing Holes 8 holes each 0.208 - 0.234 dia. Inches (5.28 - 5.94mm) 
ENVIRONMENTAL
Designed to EnvironmentaL

MIL-E-5400 Class 2

MIL-STD-810 

Finish

  • Antenna - Urethane Lusterless Black Standard
  • Baseplate - Unpainted, Alocrom 
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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