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Combined VHF/L-Band Blade Antenna

118-156 MHz & 960-1220 MHz

SKU: 21-50-56-5

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Combined VHF/L-Band Blade Antenna

The 21-50-56-5 is a combined VHF/L-Band blade antenna suitable for use with VHF ATC and DME/TACAN systems fitted to helicopters and fixed wing aircraft operating up to Mach 0.95. Construction comprises a high strength, glass epoxy radome set into an aluminum alloy base collar with internal ‘foamed-in-place’ radiating, matching and filtering elements. RF design insures good azimuthal omni-directivity and minimal interaction between VHF and DME/TACAN elevation patterns. This antenna has DC grounded elements for P-Static and indirect lightning strike effects protection.

  • Suitable for VHF ATC and DME/TACAN
  • Passive design - requires no external tuning
  • Isolated VHF and L-Band outputs
  • Fully sealed internally foamed high strength blade design
  • Drop on replacement for AT-1108 and AS3191 mounting hole pattern
  • Environmental design to MIL-STD-810, –55ºC to +71ºC, 55,000 feet
  • Lightning protected per MIL-B-5087, less than 500v imported 
21-50-56-5
Model # 21-50-56-5
Brand Cooper Antennas
Frequency

118 - 156 MHz and

960 - 1220 MHz 

Gain

118-156 MHz ≥ 0 dBi average

960-1220 MHz ≥ +2 dBi average

VSWR

≤ 2.5:1 118 - 156 MHz

≤ 2:1 960 - 1220 MHz

Impedance (nominal) 50 Ohms
Power

VHF 50 Watts CW

L-band 2 kW Peak  

Isolation

≥ 50 dB (L-Band to VHF)

≥ 25 dB (VHF to L-Band)

Polarization Essentially vertical (when mounted vertically) 
Radiation Pattern Nominally omni-directional in azimuth and Co-sinusoidal in elevation
Antenna RF Connector

VHF - TNC Female

L-Band - N Female

Antenna Shell Type High density foam filled epoxy/fiber glass shell set in aluminum alloy base collar
Height 14.75 inches (375mm) 
Weight 3.75 lbs (1.7kg) 
Side Loading  ≥ 8 psi ultimate 
Base Plate Shape Tear drop
Fixing Holes 6 x Ø 0.200 inches (5mm) holes, counter bore Ø 0.39 inches (9.9mm) 

Finish

  • Urethane Lusterless Black Standard
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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