South Midlands Communications Group

HF Dipoles Centre Fed Delta

Centre Fed Dipole Antenna SMC are specialist manufacturers of a wide range of HF communications antennas. Our world wide experience of antenna requirements enables us to offer the most suitable antenna for customer installation together with a prompt delivery service. All our antennas are made from high quality purpose designed components suitable for the most extreme environments. These antennas can be supplied ready made for specific frequencies or cut overlength and supplied with line taps and frequency charts for simple on site adjustment.

These antennas are most suited for short to medium range working. When suspended about a quarter wave above ground level radiation is predominantly upwards, giving some omnidirectional coverage using skywaves. As the height above ground level is increased to a half wave, the radiation pattern tends to a figure of eight.

General Specifications as Full Wave Cage Dipole.

Antenna Elements 7/0.44" (7/1.118rnm) or 7/0.36" (7/0.914mm) hard drawn copper magnesium strand.
Insulators Carbon loaded polypropelene.
Spreaders Antenna spreaders used on FDA/1 are fibre-gjass. Feed Iine spreaders are porcelain or fibreglass as appropriate.
Baluns SMC can supply a wide range of matching balun transformers for all combinations of input impedances and powers.

 

Bandwidth: +/- 2% of centre frequency
VSWR Better than 1.5 : 1
Power: Up to 2kW
Impedance: 50 ohms
Polarisation: Horizontal

 

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