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OM2500A

General description and the advantages of the OM2500A Amplifier

The linear amplifier OM2500A is designed for all short wave amateur bands from 1.8 till 29 MHz (including WARC – bands ) and all modes . It is equipped with a ceramic tetrode FU-728F.


The advantages of OM2500A:

  • 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 OM2500A:

Frequency coverage: amateur bands 1.8 – 29.7 MHz including WARC
Power output: 2500 W in SSB and CW
2000 W in RTTY, AM and FM
Driver Power: 60 to 80 W for full Output Power
Input impedance: 50 Ohm VSWR < 1.5 : 1
Output amplification: 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: 32 dB below nominal output
Suppression of harmonics: < -50 dBc
Tube: FU-728F Ceramic tetrode
Cooler: Centrifugal blower + axial blower
Power supply: 2 x 230 V - 50 Hz one or two phases
Transformers: 2 pcs of toroidal transformer 2.0 kVA
Protection circuits: - SWR too high
  - Anode current too high
  - Screen current too high
  - Grid current too high
  - Mistuning of power amplifier
  - Soft start for protecting your fuses
  - “switch –on blocking “ at opened amplifier
Bar graph indications: - Power output – bargraph 50 LED
  - Reflected power – bargraph 20 LED
  - Current at screen ( Ig2 – bar graph 10 LED )
  - Anode voltage, anode current, tuning – bargraph 30 LED
LED indicators: - current at control grid ( Ig1 – 2 LED )
  - WAIT – preheating of tube (180 sec )
  - STBY– standby
  - OPR – operating condition
  - FAULT – failure, switching off for abt. 4 sec
  - Inhibit – operating condition
  - ANT 1 - which ANT is use
  - ANT 2 – which ANT is use
  - UP – DWN - listing in menu
  - MAN - manual operating
  - AUTO - automatic operating
  - TUNE - tuning
  - ANT - ANT selection
Parameters: 485 x 200 x 455mm (width x height x depth)
Weight: 40 kg