HF 30kW 2017-01-11T09:31:47+00:00

HF300 Series – 30kW HF Wide Band Antenna Matching Transformer

The HF300 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.

HF 300 seriesPlease contact us for a quote or for more information


Balanced Impedance (ohm)
Unbalanced impedance (ohm)5075100200300370450600
50HF300-55HF300-57HF300-510HF300-520HF300-530HF300-537HF300-545HF300-5
75HF300-75HF300-77HF300-710HF300-720HF300-730HF300-737HF300-745HF300-760
Technical Specs. 
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.

All specifications are that of typical performance.