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1. GENERAL INFORMATION
1.1. Introduction
The OM Power model OM4000 HF is a manual tuning 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 a two pieces of ceramic tetrode FU728F.
1.2.
Specification
1.2.1.
Parameters
Frequency Coverage
Amateur Bands 1.8 – 29.7 MHz including WARC
Power Output
1500W PEP continuous output – no time limit
Input Power
Usually 50 to 70W for full Output Power
Input power can not exceed 100W !
Input Impedance
50 Ohm, VSWR < 1.5 : 1
Power Gain
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
32dB below nominal output
Suppression of harmonics
< -50 dBc
Tubes
2x FU728F Ceramic tetrode
Cooler
Centrifugal Axial blower
Power supply
240V – 60Hz
Transformers
2 pcs of toroidal transformer 3kVA
Dimensions
485x200x455mm (width x height x depth) (
19”x8”x18”)
Weight
43 kg (94.8 lbs)
1.2.2.
Protection Circuits
There are 11 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
Input power too high
Output power too high
Plate voltage too low
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
