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OM4001HF

General description of the OM4001HF amplifier

The linear amplifier OM4001HF is a manual tune 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.


Specification of OM4001HF:

Frequency coverage: Amateur bands (1.8 – 29.7) MHz including WARC
Power output: 4000 W in SSB and CW on HF bands,
3000 W in RTTY, AM and FM
Input Power: Usually 40 to 70 W for full output power
Input Impedance: 50 ohm, VSWR < 1.5 : 1
Power Gain: 17 dB
Output Impedance: 50 ohm unbalanced
Maximum Output SWR: 3:1
SWR protection: Automatic switching to STBY, when reflected power is 350 W or higher
Intermodulation distortion: -32 dB below nominal output
Suppression of harmonics: < -50 dBc
Tubes: 2x FU728F ceramic tetrode
Cooler: Centrifugal blower + axial blower
Power supply: switchable voltages - 220/230/240 V for 50 Hz or 230/240/250 V for 60 Hz
(or other primary voltages e.g. 200 V 50/60 Hz for Japan)
Transformers: 2 pcs. of toroidal transformer 3 kVA
Dimensions: 485 mm x 200 mm x 455 mm (width x height x depth)
Weight: 46 kg
Protection circuits: - VSWR too high
  - Anode current too high
  - Anode voltage error
  - Screen current too high
  - Screen voltage error
  - Grid current too high
  - Grid voltage error
  - Heating voltage error
  - Mistuning of PA
  - Temperature too high
  - Soft start for protecting your fuses
  - “switch-on blocking“ at opened amplifier
Indications: 4.3" color touch screen display
Features: High level of protection
  Memory for faults and warnings, easy maintenance
  Automatic set-up anode current (BIAS) – no need to adjust manually after changing the tubes
  Three programmable working modes of the axial blower
  Full QSK operation
  Many operational parameters to display
  The smallest and lightest 4000 W Power Amplifier on the market