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GENERAL INFORMATION
1.1. Introduction
he OM Power model OM2501A and OM3501A are designed for all short wave amateur bands
from 1.8 to 29.7 MHz (including WARC bands) and all modes. OM2501A is equipped with a FU-
728F or GU84B ceramic tetrode and OM3501A is with GU78b ceramic tetrode.
1.2. Specification
1.2.1. Parameters
Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC
Power Output OM2501A 2500+ W in SSB/CW on HF bands
2000 W in RTTY and DIGI modes
Power Output OM3501A 3500+ W in SSB/CW on HF bands
3000 W in RTTY and DIGI modes
Input Power Usually 40 to 60W 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 350W or higher
Intermodulation distortion -32dB below nominal output
Suppression of harmonics < -50 dBc
Tubes FU-728F or GU84B in OM2501A
GU78b in OM3501A
Cooler Centrifugal blower + Axial blower
Power supply switchable 2 x 220 ,230V, 240 V – 50 Hz one or two phases
Transformers 2 pcs of toroidal transformer 2 kVA ( 3 kVA for OM3501A)
Dimensions 485 x 200 x 455mm (width x height x depth)
Weight 42 kg ( OM3501A 45kg )
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