1.4. Features
• Easy to operate
The plate-load True Resistance Indicator (TRI) is an ACOM innovation that provides quick and precise
tuning, typically in less than 10 seconds. The AUTO-OPERATE function will return the amplifier to the
OPERATE mode automatically after each protection trip, saving time and avoiding manual switching.
• No antenna tuner needed
No external antenna tuner is required as long as the antenna SWR is 3:1 or lower. The amplifier will
perform the functions of an antenna tuner, enabling you to change antennas faster and use them over
wide frequency ranges.
• User-friendly and durable
This amplifier is both user-friendly and self-monitoring. It is designed to safely withstand up to 240 W
of reflected power, up to 100 milliseconds of drive spikes (RF "tails" after a PTT or KEY release), and
even operator tuning errors. It is also capable of operating at more than half its designed output
power at only 75% of nominal line (mains) voltage. Because it can tolerate deep voltage drops (down
to zero for 10 milliseconds) and 15% line voltage spikes, it is particularly suited for use in portable
environments, such as field days and DXpeditions.
• LED bar-graph display
The upper LED bar-graph always reads peak forward power (except for the service functions) while the
lower LED bar-graph is for the reflected power. LED warning indicators are provided for abnormal
conditions of grid 1, grid 2, and plate parameters.
• Antenna selection
Two antenna outputs are selectable on the front panel of the amplifier.
• Efficient tuning
Antenna matching can be achieved in less than 10 seconds and at a quarter of nominal output power,
which produces lower risk of interference to other stations and greater safety to the amplifier
components.
• Transceiver-independent
The amplifier operates without special signaling from the transceiver. It needs only "ground on TX"
and 60 W RF drive power to operate at full output power.
• Broadband input matching
Broadband input matching circuitry offers excellent loading characteristics for the driving transceiver,
from 1.8 MHz to 30 MHz.
• Single tube operation
A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of
800 W (forced air cooling, grid-driven) is used for maximum efficiency.
• Permanent monitoring and protection of the plate and grids currents
The Bias Optimizer minimizes heat dissipated by the tube, assuring tube longevity.
• High voltage protection
Design of the high-voltage power supply eliminates the danger of turn-on transients affecting sensitive
devices connected to the same line (mains) circuit. Moreover, the amplifier can be configured for 8
different nominal line voltages: 100, 110, 120, 200, 210, 220, 230, or 240 VAC, 50 or 60 Hz.
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