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AT-741 Series L-Band Blade Antenna

The radiating element is encapsulated in an epoxy dielectric body by a transfer molding process. The antenna is impervious to moisture penetration by direct immersion or extended exposure to high humidity conditions. The rugged design includes an interlocked mounting base and radiating element molded into the dielectric body for a completely unified, integral and rugged assembly. The molding process is a high-production technique, substantially reducing antenna cost.

The AT-741 is provided with a BNC female test probe for preflight checkout. Although L3Harris manufactures all of the above AT-741 types, L3Harris strongly recommends customers replace all A/A, B/A with the B/B version when reordering. The B/B version of this antenna improves mechanical performance with side-load levels to 15 psi.

Key Features:

  • Moisture proof
  • Rugged design
  • Low cost
  • Used with:
    • Distance measuring equipment (DME)
    • Identification friend or foe (IFF)
    • Tactical air navigation (TACAN)
    • Telemetry
    • Electronic countermeasure (ECM) systems

AT-741 Series Antenna Specifications

Electrical
Frequency range (MHz) 960-1220 MHz
VSWR 960-1220 MHz – 1.4:1
1000-1100 MHz – 1.3:1
Probe VSWR 1.5:1
Probe coupling -16 to -19 dB
Gain Within 0.5 dB of a matched λ/4 stub
Polarization Vertical
Radiation patterns Consult with factory
Power handling 100 W average, 4.0 kW peak
Mechanical
HN 8 oz.
Aerodynamic drag Sea level, Mach 0.5 – 13 oz.
Sea level, Mach 0.8 – 30 oz.
Military MIL-E-5400, MIL-A-7272, MIL-G-5272
Connectors AT-741/A AT-741 A/A AT-741 B/B
  Mating connector HN HN HN
  Connector clearance hole in aircraft 1.10-1.25 in. 1.10-1.25 in. 1.10-1.25 in.
  960-1220 MHz
  1000-1100 MHz
1.8
1.6
1.7
1.5
1.4
1.3

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