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Multi-function V/UHF LOS/UHF Satcom and GPS Antenna

30-512 MHz & 240-400 MHz 1564-1587/1216-1239 MHz

SKU: 21-50-78

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Multi-function V/UHF LOS/UHF Satcom and GPS Antenna

The 21-50-78 is a rugged multifunction V/UHF LOS, UHF Satcom and GPS antenna designed for airborne applications. A high strength aerodynamic vertical shell houses a 30 to 512 MHz linear element that can be used for V/UHF line of sight “LOS” communications or UHF Satcom at low angles of elevation. 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 and an L1/L2 passive GPS antenna. The antenna is completely sealed and filled with closed cell foam for long term protection against moisture ingress and reliability is further enhanced by a polyurethane rubber coating over all leading edges. 

  • Hi angle UHF Satcom & MUOS coverage
  • Lo Angle V/UHF LOS communication
  • Covers L1 and L2 GPS Frequencies
  • EPLRS compatible
  • 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
21-50-78
Model # 21-50-78
Brand Cooper Antennas
Frequency

UHF Hi Angle

V/UHF Lo Angle 

GPS

240 - 400 MHz

30 - 512 MHz

1564 - 1587 / 1216 - 1239 MHz

Gain

Hi Angle

Lo Angle

 

 

GPS

+6.5 dBiC

-20 dBi @ 30 MHz -8.0 dBi @ 88 MHz

-5.0 dBi average @ 118-174 MHz

+2.0 dBi average @ 225 - 512 MHz

+3.0 dBiC @ Zenith  

VSWR

Hi Angle

Lo Angle

 

GPS

 ≤ 2.0:1

≤ 2.5:1 30-451 MHz

≤ 3.0:1 451-512 MHz 

≤ 2.0:1

Impedance (nominal) 50 Ohms for both ports 
Power

Hi Angle

Lo Angle

 

 

GPS

200 Watts CW

50 Watts (30-88 MHz),

50 Watts (118-174 MHz)

200 Watts (225-512 MHz)

1 Watt 

Polarization

Hi Angle

Lo Angle

GPS

Right Hand Circular

Vertical

Right Hand Circular 

Antenna RF Connector

UHF Hi Angle

UHF Lo Angle

GPS

N Female

TNC Female

TNC Male  

Height 12.9 inches (328mm) max
Wingspan 13 inches (330mm) max 
Weight 9.86 lbs (4.47Kg) 
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 Grey
  • Baseplate - Unpainted, Alocrom 
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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