The ACOM 2000A Automatic HF Linear Amplifier is the world's most
advanced HF amplifier designed for amateur use. The ACOM 2000A is the first amateur
HF amplifier to include both fully automatic tuning and sophisticated digital control
capabilities. This revolutionary new amplifier delivers maximum legal power in all modes
and operates on all HF amateur bands.
A New Standard in Amplifier Features and Performance
The ACOM 2000A represents a major advance in the state-of-the-art
in HF amplifier design. It changes forever the way radio amateurs employ HF power
amplifiers in their stations.
- Instantaneous, automatic tuning makes slow, cumbersome band changes a thing of the past.
- A built-in, wide-range antenna tuner matches loads with high VSWR (up to 3:1), often
eliminating the cost and complexity of an external, high-power antenna tuner.
- RS-232 digital control permits full integration into any computer-driven station
- Advanced protection circuits ensure amplifier safety under every potential combination
of operating conditions.
- Remote diagnostic features and modular design ease fault isolation and repair
Cutting-Edge Technology Enhances a Classic Design
At the core of the ACOM 2000A is a classic HF amplifier design,
employing two Svetlana 4CX800A (GU74B) high performance ceramic metal tetrodes operating
in a grid-driven configuration. This design was chosen for its inherent stability and
extremely low production of spurious emissions. ACOM coupled this tried-and-true
configuration with today’s most advanced digital control technology to create an
amplifier with outstanding performance, features and reliability.
Grid-driven tetrodes, cathode negative feedback, excellent transceiver loading
(typically below 1.2:1 input VSWR), and regulated SG voltage result in an extremely low
distorted output. Measured typical IMD are - 40dB (3-rd order) and - 45dB (5-th
order). Classical Pi-L network, all-air coils (no ferrite), and
carefully designed layout of the output tank offer typical harmonic emissions as low as
- 55dBc (second) and below - 70dBc (third and above). Thus, probability of QRM,
BCI or TVI is dramatically minimized.
Fully Automatic Tuning
The automatic tuning features in the ACOM 2000A represent a real
breakthrough in HF amplifier design. Never think about an ATU for VSWR up to 3:1 (2:1 on
160 m). Matching the actual antenna impedances to the optimum tubes load is completely
automated. Typically 1 second and no skill is required.
By completely eliminating time-consuming tune-up procedures, the
ACOM 2000A has gives contesters a real edge. It is now possible to change bands
without a moment’s thought. You can work every multiplier spotted using software
point-and-shoot – regardless of band. And always know the amp is properly tuned and
operating safely. The amplifier follows your transceiver's band and frequency
automatically in less than a second. No special cables are required. Just a dot on CW or
"Ah" on SSB are enough.
The ACOM 2000A breaks every amateur band into multiple frequency
segments. The user can store up to ten (10) sets of tuning adjustments for every frequency
segment - allowing individual settings for multiple antennas on each band. VSWR can
increase considerably when an antenna is operated away from its resonant frequency. Unlike
other amplifiers on the market today, the ACOM 2000 output matching network allows
the amplifier to operate at full power, even with VSWR as high as 3:1 (2:1 on 160m).
Advanced Digital Control
Microprocessor control improves performance and makes possible a wide
range of new, advanced features.
Full break-in (QSK) based on a built-in vacuum relay. Transmit / receive switching
sequence is secured by a dedicated microprocessor.
Remote Control Unit
RCU Size: 167 x 130 x 25mm (6-2/3" x 5-1/8" x 1")
Only the Remote Control Unit needs to be placed near the operator. The main unit can be
installed up to 3 meters (10 feet) away. RCU features include: amplifier status shown on
LCD display, control of all functions, measuring and/or monitoring of the 20 most
important parameters, on-board technical assistance, troubleshooting suggestions,
record of power-on hours, password provided.
The protection system makes damaging the amplifier a difficult job. Information on the
12 most recent protection trips is stored in an INFO BOX for remote diagnostics via phone
line, PC, and Internet.
RS232 and Network
All functions are accessible from a PC via RS232 serial port. Local network may
include more than one amplifier / antenna unit set working in a system.
All tubes voltages and currents, supply voltages, overheating, overdrive, insufficient
flow of cooling air, internal and external RF arcs (in the amplifier, antenna selector,
tuner or antennas), T/R sequencing, antenna relay contact hot switching, antenna matching
quality, reflected power, stored data, inrush power-on current, and cover interlock for