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1. GENERAL INFORMATION
1.1. Introduction
The OM Power model OM2500A is a fully 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 one GU84b ceramic tetrode.
THE ADVANTAGES OF OM2500A
Full compatibility with: ICOM, ELECRAFT, KENWOOD, TEN-TEC ORION, YAESU
and Icom transceive protocol using by MicroHAM devices ( CI-V output ).
Automatic switching between bands
Automatic tuning within the band according to segments
Automatic switching of band pass filter
Automatic switching of antenna switches
The possibility to use 2 different antennas within one band or segment
1.2. Specification
1.2.1. Parameters
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
Input Power Usually 60 to 80W for full output power
Input Impedance 50 Ohm, VSWR < 1.2 : 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
350Wor higher
Intermodulation distortion 32 dB below nominal output
Suppression of harmonics < -50 dBc
Tuning Manual or AUTO
Response speed of AUTO Less than 0.5 sec within the same band
Less than 3 sec. if out of the band
Tube GU84b 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
Parameters 485 mm x 200 mm x 455 mm
(width x height x depth)
Weight 40 kg
1.2.2. Protection Circuits
There are 8 special protection circuits used in the amplifier. They are activated when one or
more of next parameters exceed defined values or some unwanted occasion occurs.
