Communication Technical Services

HF300 Series – 30kW HF Wide Band Antenna Matching

The HF100 Series are 30 kW average power silicone cooled transformers suitable for communication or broadcast systems.

The units are housed in a finned cast aluminium tank which provides excellent natural convection cooling. Each casting is subjected to a double vacuum resin impregnation process which ensures complete sealing for the internal low loss silicone cooling oil.

High purity alumina ceramic insulators with arcing horns are fitted as standard and an integral static drain to earth provides additional protection against lightning induced high voltages.

  • Wide band 1.5 to 32 MHz
  • 30 kW average + 100% AM modulation
  • Suitable for communications or broadcast applications
  • Very high efficiency
  • All weather unprotected operation

A wide selection of unbalanced and balanced impedance ratios are available to complement most antenna configurations and enquiries for non-standard arrangements are welcome.

The HF300 is a high quality unit suitable for unprotected operation in any environment.

HF300 Dimensional Drawing

 

Type Designations for HF300 Series and Technical Specification

Balance Impedance (ohm)
Unbalanced impedance (ohm)
50
75
100
200
300
370
450
600
50
HF300-55
HF300-57
HF300-510
HF300-520
HF300-530
HF300-537
HF300-545
HF300-560
75
HF300-75
HF300-77
HF300-710
HF300-720
HF300-730
HF300-737
HF300-745
HF300-760

 

Frequency: 1.5 – 32 MHz
Impedance: See table above
Power: 30 kW average + 100% am modulation
Insertion loss: Less than 0.2 dB
VSWR: Less than 1.2:1 (2 – 30 MHz), Less than 1.3:1 (1.5 – 32 MHz)
Balance ratio: Greater than 26 dB
Load VSWR: 2.5:1 max.
Coaxial connectors: 3 1/8″ EIA
Balance terminals: Alumina ceramic M12 thread
Temperature range:  -40ºC to +55ºC
Weight: 120kg gross
High voltage protection: Arcing horns and internal static drain
Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
Shipping dimensions: 1000 x 700 x 550 mm approx.
TA Series

TA Series
The TA Series of transformers are rugged and lightweight, ideal for inclusion in transportable HF antenna systems...READ MORE

Hybrid Combiner
Hybrid Combiner Broad band hybrid combiners offer a means of combining or splitting transmitter powers and providing isolation between the separate signal paths...READ MORE