HF 20kW 2017-01-11T09:31:47+00:00

HF200 Series – 20kW HF Wide Band Antenna Matching Transformer

The HF200 series are 20 kW average power transformers suitable for communications 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 internal static drain to earth provides additional protection against lightning induced high voltages.

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

A wide selection of unbalance and balance impedance ratios are available to complement most antenna configurations and enquiries for non-standard arrangements are welcome. The HF200 is a high quality unit suitable for unprotected operation in any environment.  The HF200 Series supersedes all Minns “Y” types of 20kW transformers.

HF 200 SeriesPlease contact us for a quote or for more information


Balanced Impedance (ohm)
Unbalanced impedance (ohm)5075100200300370450600
50HF200-55HF200-57HF200-510HF200-520HF200-530HF200-537HF200-545HF200-560
75HF200-75HF200-77HF200-710HF200-720HF200-730HF200-737HF200-745HF200-76
Technical Specs.
Frequency:1.5 - 32 MHz
Impedance:See table above
Power:20 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:1 5/8", 3 1/8" EIA
Balance terminals:Alumina ceramic M12 thread
Temperature range:-40ºC to +55ºC
Weight:110kg gross
High voltage protection:Arcing horns and internal static drain
Configuration:Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
Shipping dimensions:700 x 600 x 500 mm approx.

All specifications are that of typical performance.