3
Introduction
The Commander HF-2500 Export is class AB
2
linear power amplifier. It has been designed
for operation on all amateur frequencies from 1.80 MHz to 29.7 MHz, excluding the 30 meter
band.
Three Eimac 3CPX800A7 pulse rated ceramic-metal triodes configured in a grounded grid
circuit allow for conservative operation at 2800 watts continuous carrier output. A pressurized
forced air cooled chassis, including the high voltage supply insures cool operation with high
duty cycle emission modes.
The output circuit utilizes extra heavy duty components with vernier reduction drives on all
tuning controls. Easily accessed rear panel controls allow for operator adjustment of input
VSWR and ALC.
An automatic time delay circuit, insures proper cathode conditioning before RF drive can be
applied. A protective circuit shuts down the amplifier in the event of excessive grid current. A
resistor located in the high voltage B+ circuit protects the tube in the event of an internal tube
arc. Metering functions includes plate voltage, plate current, grid current and relative output.
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