< >

OM4000A FCC approved

General description and the advantages of the OM4000A amplifier

NEW FCC approved version for USA. Exclusively available at our dealer for North America - Array Solutions (http://www.arraysolutions.com)

The OM Power model OM4000A is an automatic power amplifier, designed for use on all short wave amateur bands from 1.8 to 29.7 MHz (including WARC bands) and all modes. It is equipped with a two pieces of ceramic tetrode FU728F.


The advantages of OM4000A:

  • Automatic switching between bands
  • Automatic tuning with the band according to segments
  • Automatic switching of band pass filter
  • Automatic switching of the antenna switch
  • The possibility to use 2 different antennas within one band or segment
  • Full compatibility with
    • - ICOM
    • - YAESU
    • - ELECRAFT
    • - Ten-Tec Orion
    • - Kenwood
    • - Icom transceive protocol using by microHAM devices –CI-V output (MK II, MK2R, MK2R+, etc)
    • - Flex Radio Series 6xxx

Specification of OM4000A:

Frequency coverage: Amateur Bands 1.8 – 29.7 MHz including WARC
Power output: 1500W continuous output – no time limit
Input Power: Usually 50 to 70W for full Output Power
Input power can not exceed 100W !
Input Impedance: 50 Ohm, VSWR < 1.5 : 1
Power Gain: 15 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: 240V – 60 Hz
Transformers: 2 pcs of toroidal transformer 3kVA
Dimensions: 485 x 200 x 455mm (19” x 8” x 18”) [width x height x depth]
Weight: 46 kg (101.5 lbs)
FCC ID: X8NOM4000A
Protection circuits: - 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
LED indicators: - Current at control grid (Ig1) - 2 LEDs
  - WAIT – preheating of tube (150 sec.)
  - STBY - standby
  - OPR – operation mode
  - FAULT – failure, switching off for abt. 2 sec.
  - INHIBIT – operating condition
  - ANT 1 - which ANT is in use
  - ANT 2 – which ANT is in use
  - ANT - ANT selection
Bar graph indications: - Power output – 50 LEDs
  - Reflected power – 20 LEDs
  - Ig2 current - 10 LEDs
  - Anode voltage, anode current, tuning – 30 LEDs
Buttons: UP/DWN - listing in menu
  MAN - manual operating
  AUTO - automatic operating
  TUNE - tunning
  SET - confirm selected parameter
OSD Indicator: LCD Display 2 x 16 Characters