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General description and the advantages of the OM2501A amplifier

The automatic linear amplifier OM2501A is designed for all short wave amateur bands from 1.8 to 29 MHz (including WARC – bands) and all modes. It is equipped with a one piece of ceramic tetrode FU-278F or GU84B.

The advantages of OM2501A:

  • Full compatibility with TRXs-CAT
    • - 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
    • - Apache Labs Anan
  • RF sensitive Band and Frequency switching, for use with radios which do not have CAT
  • Automatic switching between bands
  • Automatic tuning with the band according to segments
  • Automatic switching of band pass filter – BAND DATA output compatible with YAESU radios (BCD code)
  • Automatic switching of the antenna switches - maximum number of antennas is 10, controlled by BCD output code
  • Remote control via PC Windows Application

Specification of OM2501A:

Frequency coverage: Amateur bands (1.8 – 29.7) MHz including WARC
Power output: 2500 W in SSB and CW on HF bands,
2000 W in RTTY/FM
Input Power: 30 to 60 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: better than -32 dBc
Suppression of harmonics: < -50 dBc
Tube: 1x FU-728F or GU84B ceramic tetrode
Cooler: Centrifugal blower + axial blower
Response speed of AUTO tune: less than 0.5 s within same BAND, less than 2 s if out of BAND
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 2 kVA
Dimensions: 485 mm x 200 mm x 455 mm (width x height x depth)
Weight: 40 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 manually adjust after changing the tube
  Three programmable working modes of the axial blower
  Full QSK operation
  Many operational parameters to display
  REMOTE control - connector for LAN connection – remote control software free of charge
  Support automatic external ANT switching

LAN Connection

Power amplifier is interfaced to LAN via XPORT made by Lantronix (type XP1001000-05R). More info can be found at www.lantronix.com .

Default factory settings of XPORT are:

IP address:

These are strictly default settings. You can modify any of these by going to XPORT web GUI via your web browser. We do not recommend changing any other parameters of the XPORT interface as loss of communication can be caused by doing so. There is no default user name or password. It is highly recommended to secure web interface with username and password.

For remote control and monitoring over LAN special software is needed. It is available free of charge; it can be downloaded from the following link: Remote control software version 3.38

NOTE: For the correct functioning of the software, it is necessary to have accessible LAN ports 9999 and 10001.