HF200 Series – 20kW HF Wide Band Antenna Matching

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.

SpecificationData
Frequency1.5 – 32 MHz
ImpedanceSee table below
Power20 kW average + 100% am modulation
Insertion lossLess than 0.2 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 connectors1 5/8″, 3 1/8″ EIA
Balance terminalsAlumina ceramic M12 thread
Temperature range-40ºC to +55ºC
Weight110kg gross
High voltage protectionArcing horns and internal static drain
ConfigurationCast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
Shipping dimensions700 x 600 x 500 mm approx.
Balance Impedance (ohm)
Unbalanced impedance (ohm) 5075100200300370450600
50HF200-55 HF200-57 HF200-510 HF200-520 HF200-530 HF200-537 HF200-545 HF200-560
75HF200-75 HF200-77 HF200-710 HF200-720 HF200-730 HF200-737 HF200-745 HF200-760