User Manual

4
1. GENERAL INFORMATION
1.1. Introduction
The OM Power model OM2500HF is a manual tuning, full legal limit amplifier, designed for
heavy duty use on all short wave amateur bands from 1.8 to 29.7 MHz (including WARC
bands) and all modes with no time limit. It is equipped with one GU84b ceramic tetrode.
1.2. Specification
1.2.1. Parameters
Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC
Power Output 1500w PEP continuous output all modes - *no time
limit*
Input Power 40 to 60W for full output power
Input Impedance 50 Ohm, VSWR < 1.5 : 1
Power Gain typically 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 36 dB below nominal output
Suppression of harmonics < -52 dBc second, < -65 dBc third
Tube GU84b Ceramic tetrode
Cooler Centrifugal blower + axial blower
Power supply 240 V - 60 Hz
Transformers 2 pcs of toroidal transformer 2,0 kVA
Parameters 485 mm x 200 mm x 455 mm [19.1” x 7.9” x 17.9”]
(width x height x depth)
Weight 38 kg ( 84 lb )
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.
 VSWR too high
 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