The linear amplifier OM4000 HF is designed for all short wave amateur bands from 1.8 till 29 MHz (including WARC) and all modes. It is equipped with a two pieces of ceramic tetrode FU728F.

PARAMETERS:

  • Frequency Coverage: Amateur Bands 1.8 – 29.7 MHz including WARC
  • Power Output: 4000W in SSB and CW,
  • 3000W in RTTY, AM and FM
  • Input Power: Usually 60 to 90W for full Output Power
  • Input Impedance: 50 Ohm, VSWR < 1.5 : 1
  • Power Gain: 17 dB
  • Output impedance: 50 Ohm unbalanced
  • Maximum output SWR: 2:1
  • SWR protection: Automatic switching to STBY, when reflected power is 350W or higher
  • Intermodulation distortion: 32dB below nominal output
  • Suppression of harmonics: < -50 dBc
  • Tubes: 2x FU728F Ceramic tetrode
  • Cooler: Centrifugal blower + Axial blower
  • Power supply: 2 x 230V – 50 Hz one or two phases
  • Transformers: 2 pcs of toroidal transformer 3kVA
  • Dimensions: 485 x 200 x 455mm (width x height x depth)
  • Weight: 43 kg

PROTECTIONS:

– VSWR too high
– Input power too high
– Output power too high
– Plate voltage too low
– Anode current too high
– Screen current too high
– Grid current too high
– Mistuning of PA
– Hot switching protection
– Soft start for protecting your fuses
– “switch-on blocking “ at opened amplifier

BAR GRAPH INDICATORS:

– Power output – 50 LEDs
– Reflected power – 20 LEDs
– Current at screen ( Ig2 –10 LEDs )
– Anode voltage, anode current, tuning – 30 LEDs

LED indicators: – current at control grid ( Ig1 – 2 LEDs )
– WAIT – preheating of tube (180 sec )
– STBY – standby
– OPR – operating condition
– FAULT – failure, switching off for abt. 4 sec

Price: 5300 EUro

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