HF500/1000 High Power Broadcast Antenna Matching

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 SMC offers the HF 1000 range providing 200 or 300 Ohm balanced outputs.

Frequency3 – 22 MHz
Input Impedance50 ohms unbalance
Output Impedance200 ohm or 600 ohm balance
PowerHF500 – 50kW average + 100% broadcast modHF1000 – 100kW average + 100% broadcast mod
Insertion lossLess than 0.1 dB
VSWRLess than 1.2:1
Balance ratioGreater than 26 dB
Load VSWR2.5:1 max.
Coaxial connectors3 1/8” and 6 1/8” EIA
Balance terminalsAlumina ceramic M12 thread
Temperature range-40ºC to +55ºC
Weight450kg gross
High voltage protectionArcing horns and internal static drain
ConfigurationAluminium tank, silicone oil cooled, pressure relief valve fitted.