The 50kW and 100kw series of broadcast antenna matching transformers are suitable for inclusion in systems where 200 ohm or 300 ohm open wire feeds need to be matched to a 50 ohm coaxial feeder. The units are housed in aluminium tanks, silicone oil cooled to minimise losses and a major feature is broad band operation without the use of ferrite material in the transformer design.

  • 50kW average, Type HF500
  • 100kW average, Type HF1000
  • 100 kW Average + 100% AM Mod
  • Broad band 3-22 MHz
  • Very low loss
  • All-weather unprotected operation

These antennas require small size broad band matching networks and CTS offers the HF 1000 range providing 200 or 300 Ohm balanced outputs.

HF500/1000 Dimensional Drawing

Technical Specification

Frequency: 3 – 22 MHz
Input Impedance: 50 ohms unbalance
Output Impedance: 200 ohm or 300ohm balanced
Power: HF500 – 50kW average + 100% broadcast modHF1000 – 100kW average + 100% broadcast mod
Insertion loss: Less than 0.1 dB
VSWR:Less than 1.2:1
Balance ratio: Greater than 26 dB
Load VSWR: 2.5:1 max.
Coaxial connectors: 3 1/8” and 6 1/8” EIA
Balance terminals: Alumina ceramic M12 thread
Temperature range:-40ºC to +55ºC shade recommended
Weight: 450kg gross
High voltage protection: Arcing horns and internal static drain
Configuration: Aluminium tank, silicone oil cooled, pressure relief valve fitted.