DX-2 LINEAR AMPLIFIER
Serial No …………
OPERATING MANUAL
January 2003
CAUTION
1 GENERAL DESCRIPTION
The Emtron DX-2 Linear Amplifier is a 1500 watt carrier output power, for the 160m through 15m amateur bands (7 bands), housed in a desk-top
cabinet with self-contained power supply and cooling system.
It utilises a single high performance tetrode, type GU84B (4CX2500), a ceramic metal tube with a plate dissipation of 2500W. The tube is air cooled by
a commercial grade forced air turbine blower system with 2 speeds, controlled by a temperature sensor. Tetrodes offer exceptionally stable operation
and levels of quality performance far exceeding that which can be expected from triodes. The harmonic output and intermodulation distortion achieved
with this tube are exceptionally low. This is especially important when dealing with a high output power.
The Emtron DX-2 is supplied as standard with a host of features including solid state metering, comprehensive
protection systems and extremely long
duty cycle. In addition, a unique Emtron QSK module is available as an option. With this installed, extremely rapid switching times between transmit
and receive are possible, with consequent advantages when using the digital modes.
Operation of the DX-2 is greatly simplified by the absence of meter switching, mechanical displays and front panel level setting controls. The front
panel moving LED display systems indicate plate voltage, plate current, output power, reflected power, screen grid current, ready, overdrive warning,
and high SWR cut-off indication.
The Emtron Electronic Bias Switch (EBS) automatically switches the standing current (typically 0.37 A) off when there is no modulation. This reduces
the average tube dissipation. On initial switch on, the unique Emtron "soft start" circuitry ensures that no damaging AC surge currents are generated.
Professional, fine output tuning adjustment is possible, due to the 6: 1 reduction mechanism fitted.
The DX-2 has been designed for 100% safe operation and long life.
Interlocking sensing circuitry constantly monitors conditions inside the
amplifier. It must be noted however, that the high voltages present inside
the DX-2 are EXTREMELY DANGEROUS. Do not remove the top cover
under any circumstances if any leads are still plugged into the rear of the
amplifier - especially if the AC lead is plugged in the power outlet. Before
any component inside the high voltage, power supply or output section is
touched, unplug all rear panel leads and allow at least 5 minutes of 'off
time'. After that, you should further check this by momentarily shorting the
tube anode to the chassis with a suitable insulated lead.
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