21-4M VHF Whip Antenna

Product Description

The 21-4 antenna is a linearly polarized, monopole antenna with wide band frequency characteristics intended for general communication and homing applications. Being of semi-rigid form, it is suitable for external fitting upon helicopters and fixed wing aircraft with a performance up to 350 kts EAS, and other similar applications. Electrical design consists of a single broad band radiating element coupled via matching circuitry to a single coaxial connector. The 21-4 consists of a tapered glass fibre sleeve supporting a light aluminium alloy radiating element. The element assembly is fitted to a metal body carrying the coaxial connector. This arrangement allows the antenna to be installed by single hole fixing and allows orientation of the coaxial connector through 360°. The antenna can be mounted true or raked using the angled spacers provided.

Specifications

• Weight:
  140 g
• Overall Length:
  562 mm
• Width of Body Base:
  23.37 mm A/F
• Diameter of Whip:
  13.2 mm
• Mounting:
  Single hole self-fixing
• Frequency Range:
  118 MHz - 152 MHz
• Impedance:
  50 Ω (nominal)
• VSWR:
  ≤ 2.5:1
• Radiation:
  Omnidirectional in azimuth (nominal) As monopole in elevation (nominal)
• Gain:
  2 dBi (average)
• Polarization:
  Linear (vertical when mounted vertically)
• Connector:
  BNC Type Female
• Operating Temperature:
  -40°C to +70°C
• Storage Temperature:
  -55°C to +85°C
• Altitude:
  7620 m
• Humidity:
  Up to 95% RH up to 55%

Product Codes

• Mfr Part No
  21-4M