21-4B

Lightweight VHF whip antenna for general applications

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21 4

Lightweight whip antenna for general VHF applications - 21-4B

The 21-4 series of antennas are a linearly polarised, monopole antenna with wide band frequency characteristics intended for general communication and homing applications. Being of semi-rigid form, they are suitable for external fitting upon helicopters and fixed wing aircraft with a performance up to 350 kts EAS, and other similar applications. 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

  • Lightweight
  • General Purpose
  • Versatile fixing
  • Wide range of bandwidth options
  • TNC and BNC options available

Specifications

  • Electrical Specs
  • Mechanical Specs
  • Standard Specs

Electrical Specs

Minimum Frequency
118
Maximum Frequency
152
Impedence
50
Return Loss VSWR
<2.5:1
Gain
2dBi (average)
Polarization
Vertical
Radiation Pattern Azimuth
Omnidirectional
Radiation Pattern Elevation
Peak Power Watts
Average Power Watts
35

Mechanical Specs

Full Dimensions LxWxH mm
562mm high
Height Above Base Plate mm
558
Mass kg
0.14
Connector Type
BNC Female, TNC Female

Standard Specs

Altitude ft
25000
Continuous Operating Temperature Min - C
40
Continuous Operating Temperature Max C
70
Vibration
RTCA DO-160C, Section 8, Categories L and Y.
Lightning
Standards
14043 (2)

Get in touch

Chelton Limited, Marlow
The Chelton Centre
Fourth Avenue
Marlow
Buckinghamshire
SL7 1TF
United Kingdom
CAGE Code: U1907