HF4 Series 400 Watt HF Wide Band Antenna Matching

Fixed station HF receiving arrays are often subjected to high voltages not normally associated with RX systems. These voltages can be present due to static build up or by lightning induced EMF’s from nearby strikes.

The HF4 Series of matching transformers, although designed for 400 Watt average power are ideal for inclusion in receiving arrays. They reduce the possibility of high voltage damage and provide a DC path to the ground which gives added protection to the receiving system.

  • Wide band 1.5 to 32 MHz
  • Ideal for fixed station receiving arrays
  • Internal static drain ground

A wide selection of balance and unbalance impedance ratios are available to complement most antenna configurations and non-standard ratios can be supplied on request.

The transformers are housed in cast aluminium cases, fully hermetically sealed for any military or commercial environment. For EMP proof operation no capacitors are incorporated.

Frequency1.5 – 32 MHz
ImpedanceSee table below
Power400 Watt average, 1600 Watt peak
Insertion lossLess than 0.3 dB
VSWRLess than 1.2:1 (2 – 30 MHz), Less than 1.3:1 (1.5 – 32 MHz)
Balance ratioGreater than 26 dB
Load VSWR2.5:1 max.
Coaxial connectors‘N’ type (Others on request)
Balance terminalsAlumina ceramic M6 thread
Temperature range-40ºC to +55ºC
Weight1.2kg gross
High voltage protectionArcing horns and internal static drain (NB No internal capacitors fitted.)
ConfigurationCast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
Shipping dimensions220 x 150 x 120 mm approx.
Balance Impedance (ohm)
Unbalanced impedance (ohm) 5075200300370450600
50HF4-55 HF4-57 HF4-520 HF4-530 HF4-537HF4-545 HF4-560
75HF4-75 HF4-77 HF4-720 HF4-730 HF4-737HF4-745 HF4-760

Download the technical data sheet for this product

The data sheet contains:

◉  Complete technical specifications, including input/output, temperature range, frequency, power and more
  Technical drawings and size dimensions

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