Combined VHF/L-Band Blade Antenna

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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)