The HF30 Series of antenna matching transformers are solid encapsulated heavy duty units suitable for the most arduous environmental conditions and designed for installation in any orientation.
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. An internal static drain to earth provides additional protection against lightning induced EMF’s.
Wide band 1.5 to 32 MHz
3 kW average, 12kW PEP
All weather solid encapsulated
Heavy duty cast aluminium case
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.
The HF30 is a unit of the highest quality and reliability.
HF30 Dimensional Drawing
Type Designations for HF30 Series and Technical Specification
Balance Impedance (ohm)
Unbalanced impedance (ohm)
1.5 – 32 MHz
See table above
3 kW average, 12kW peak
Less than 0.3 dB
Less than 1.2:1 (2 – 30 MHz), Less than 1.3:1 (1.5 – 32 MHz)
Greater than 26 dB
7/8″EIA (Others on request)
Alumina ceramic M10 thread
-40ºC to +55ºC
High voltage protection:
Arcing horns and internal static drain (NB No internal capacitors fitted.)
Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.