HF10 Series
The HF10 Series of antenna matching transformers are fully encapsulated heavy duty units designed for the most arduous environmental conditions.

The transformers are housed in a cast aluminium case, vacuum impregnated with epoxy resin and finished in epoxy paint for added protection. 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 EMF’s.

  • Wide band 1.5 to 32 MHz
  • 1 kW average, 4kW PEP
  • All weather solid encapsulated
  • Fixed station or transportable antenna arrays

For added EMP proof operation no capacitors are used in the transformer circuit. A wide selection of unbalanced and balanced impedance ratios are available to complement most antenna configurations and enquiries for non-standard arrangements are welcome. No compromise has been made to provide a unit of the highest standard of reliability.

HF10 Dimensional Drawing

Type Designations for HF10 Series and Technical Specification

Balance Impedance (ohm)
Unbalanced impedance (ohm)
Frequency: 1.5 – 32 MHz
Impedance: See table above
Power: 1kW average, 4kW peak
Insertion loss: Less than 0.3 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: ‘N’ type (Others on request)
Balance terminals: Alumina ceramic M10 thread
Temperature range:-40ºC to +55ºC
Weight: 5kg gross
High voltage protection: Arcing horns and internal static drain (NB No internal capacitors fitted.)
Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
Shipping dimensions: 425 x 300x 150 mm approx.