Safety Considerations, Explicit Definitions - Acom 2000A Operating Manual

• TFT color display. All amplifier status indicators and comments are presented on the Remote
Control Unit (RCU) display. The HELP sub-menu gives on-board technical assistance and
troubleshooting suggestions, power-on elapsed time hours etc. Two color strips display peak
forward and reflected power. Indicators are provided for OPERATE/STANDBY and for fault
conditions.
• Easy maintenance. Information on the amplifier's internal status is stored in an "INFO BOX"
for the 12 most recent protection faults. This information can be read directly from RCU display
by the operator.
• Less QRM, improved Electro Magnetic Compatibility during tuning. Retuning can be achieved
in three ways: manually via the RCU, by the transceiver's CAT system, or with a very short
transmission - a single word on SSB or a dot (even at 40 wpm) on the new frequency is enough
to change bands or segments automatically in a second. Also, the initial process of user tuning
settings preparation is done in less than three seconds at a quarter of nominal output power.
• Saves space on the operating table. Since the amplifier is controlled by the RCU, the main
unit can be located up to 20 meters (65 feet) from the operating position. The supplied 3 meter
(10 ft) cable may be easily extended to the needed length.
• Operates automatically without special signals from the transceiver - "ground on TX" (PTT)
and 60W RF drive power are sufficient to control and operate the amplifier.
• CAT connection to most transceiver models.
• Broadband input matching circuit resulting in very good load to the transceiver over the entire
short wave spectrum.
• Uses two 4CX800A (GU74B / ГУ74Б) Svetlana (Светлана) high performance ceramic-metal
tetrodes with plate dissipation of 800W each (forced air cooling, grid-driven).
• ACOM maintains strict adherence to the tube manufacturer's specifications for cooling and for
the sequence of applying and removing the different tube voltages. Starting filament current is
limited, and there is constant monitoring and protection of all supply voltages and currents. The
Bias Optimizer decreases the heat dissipated from the tubes, and there is automatic protection
against overheating or insufficient air flow.
• A novel and innovative output RF Arc protection is employed. It safeguards the amplifier,
antenna, antenna selector and tuner against severe damage in case of possible break down.
• High voltage power supply inrush current protection which eliminates the danger of affecting
sensitive devices, connected to the same mains circuit. The amplifier can be configured for 5
nominal line voltages: 100, 120, 200, 220 and 240VAC (50 or 60Hz). Other nominal values
possible on request.
• Continuous measuring and/or monitoring of 20 most important parameters of the amplifier,
exciter and antennas via RCU and computer as described in the TECHNICAL SUPPLEMENT.
• All functions are accessible from a computer via RS232 serial port connection. Also, local
networking capability exists for more than one set of amplifier / antenna units working in a system.

1-5. Safety Considerations, Explicit Definitions

The ACOM2000A Automatic HF Linear Amplifier is a Safety Class I unit, i.e. the third grounding
lead of its mains cord (which is colored yellow with two green stripes) and the ground stud on
the rear panel of the amplifier, marked GND, both must be connected to the station's grounding
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