Communication Technical Services

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.

HF200 Dimensional Drawing

 

Type Designations for HF200 Series and Technical Specification

Balance Impedance (ohm)
Unbalanced impedance (ohm)
50
75
100
200
300
370
450
600
50
HF200-55
HF200-57
HF200-510
HF200-520
HF200-530
HF200-537
HF200-545
HF200-560
75
HF200-75
HF200-77
HF200-710
HF200-720
HF200-730
HF200-737
HF200-745
HF200-760

 

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.
TA Series

TA Series
The TA Series of transformers are rugged and lightweight, ideal for inclusion in transportable HF antenna systems...READ MORE

Hybrid Combiner
Hybrid Combiner Broad band hybrid combiners offer a means of combining or splitting transmitter powers and providing isolation between the separate signal paths...READ MORE