
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.
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
configuration.
·
Advanced protection
circuits ensure amplifier safety under every potential combination of operating
conditions.
·
Remote diagnostic
features and modular design ease fault isolation and repair
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.


Only the Remote Control
Unit needs to be placed near the operator. The main unit can be installed up to
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.
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.
The ACOM 2000A offer protection
against 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 operator
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
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).
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.
Only the Remote Control Unit needs to be
placed near the operator. The main unit can be installed up to
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.
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.
The ACOM 2000A offer protection
against 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 operator safety.
Technical
Specifications
·
RF
output: 1500-2000 W keyed carrier or SSB - no time limit. Constant carrier
modes 1500W RF output - no time limit with auxiliary cooling fan.
·
Frequency
coverage: All amateur bands 1.8-24.5 MHz. 28 Mhz only with modification by
licensed amateurs.
·
Bandchange
/ Tuneup: Initial output matching process in less than 3 secs (typically 0.5
secs). Preset matching process / bandchange takes less than 0.2 second to move
to different segment, same band and less than 1 sec for QSY to different band.
·
Tuning
memories: Non-volatile for up to 10 antennas per frequency segment.
·
Drive
power: Typically 50W for 1500W output.
·
Input
impedance: 50 ohms nominal. VSWR < 1.5:1.
· Output tolerance: Up to 3:1 VSWR (2:1 on
160m) at full rated output before SWR protection circuit actuates. Higher
SWR's tolerated at lower output.
·
Harmonics:
At least 50 dB below peak output at 1500W.
·
Intermodulation:
At least 35 dB below peak output at 1500W.
·
T/R
and keying: Vacuum Relay: QSK capable.
· Tubes and circuit: 4CX800A/GU74b
tetrodes (2); resistive grid, PI-L output with RF negative feedback. Regulated
screen grid voltage.
·
ALC:
Negative going, grid derived, -11v max, rear panel adjustable.
·
Metering:
Comprehensive. Remote Control Unit provides flexible monitoring of all
amplifier operating parameters.
·
Protection:
Grid and screen current limiting, power inrush (soft-start provided), trip to
excessive reflected power, RF arcs, password access protection if needed,
correct T/R sequencing, tube exhaust overheat, cover interlock and HV crowbar.
· Fault diagnosis: Remote Control Unit
display and LED's plus "INFO Box" for 12 most recent events. PC
interface (RS-232), plus remote phone line interrogation feature.
· Cooling: Full cabinet forced-air. Rubber
isolated blower.
·
Transformer:
3.5 kVA with strip-wound Unisil-Hâ core.
·
AC
power requirements: 100/120/200/220/240 VAC nominal. 50-60 Hz. 3500VA single
phase at full power.
· Physical:
o RF Unit: 440W x 180H x 450D mm
o 135 X
25H X 170D mm
o Shipped in two cartons total weight 80lb
(36kg.) Plug in transformer for ease of installation and transport.
o No controls on RF unit except ON/OFF. RF
unit may be located up to
The latest ACOM1010, budget
160-10m small and lightweight linear amplifier, for fixed or DXpedition and
Field Day operations.
Easy operation. 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 external antenna
tuner is required
as long as the antenna VSWR 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.
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.


The upper LED bar-graph always
reads peak forward power 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.
Two antenna outputs are selectable on the front panel of
the amplifier.
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.
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 circuitry offers excellent loading
characteristics for the driving transceiver, from 1.8MHz to 30MHz.
A single Svetlana 4CX800A (GU74B)
high-performance ceramic-metal tetrode with plate dissipation of 800W (forced
air cooling, grid-driven) is used for maximum efficiency.
The Acom 1010 offer permanent monitoring
and protection of the plate and grids currents. The Bias Optimizer minimizes
heat dissipated by the tube, assuring tube longevity. 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 to accommodate any of 8 nominal line voltages
between 100 and 240 V, 50 or 60 Hz.
The amplifier can be shipped with 10 and
12-meter capability disabled as required by the Federal Communications
Commission (FCC), for
Technical
Specifications
·
Frequency
Coverage: All amateur bands in the 1.8-29.7MHz frequency range.
·
Power
Output: 700 W PEP or 500 W continuous carrier.
·
Intermodulation
Distortion: Better than 35 dB below rated output.
·
Hum
and noise: Better than 40 dB below rated output.
·
Harmonic
Output Suppression: Better than 50 dB below rated output.
· Input
and Output Impedances:
o nominal value: 50 Ohm unbalanced, UHF
(SO239) type connectors;
o input circuit: broadband, VSWR less than
1.3:1, 1.8-30MHz continuously (no tunings, no switching);
o Bypass path VSWR less than 1.1:1,
1.8-30MHz continuously, 200 W maximum;
o Output (antenna) impedance matching
capability: VSWR up to 3:1 or higher.
·
RF
Gain: 11dB typically, frequency response less than 1dB (50 to 70 W drive power
for rated output).• Primary Power: 85-132 V/170-264 V ac (100, 110, 120, 200,
210, 220, 230 & 240 V nominal taps), +10% -15% tol.), 50-60 Hz, single
phase, 1200 VA.
·
Complies
with CE safety and electromagnetic compatibility requirements as well as
FCC-regulations (10 &
·
Size
& Weight (operating): WxDxH: 406x315x150mm, 16kg.
· Operating
environments:
o temperature
range: 0...+
o humidity:
up to 95% @ +
o height: up to 3000m above sea level
without output deterioration

FEATURES
Easy operation. 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 tuner needed. No external antenna tuner is required
as long as the antenna VSWR 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.
A durable amplifier. 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 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.
Input matching. Broadband input matching circuitry
offers excellent loading characteristics for the driving transceiver, from
1.8MHz to 30MHz.
Reliable tubes. Two 4CX250B(7203) ceramic-metal
tetrodes with a total plate dissipation of 500W (forced air cooling,
grid-driven) are used for maximum efficiency.
Short warm-up period. Only 30 seconds warmup period is
required.
Permanent monitoring and protection of
the plate and grids currents. The Bias
Optimizer minimizes heat dissipated by the tubes, assuring tubes 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 to accommodate
any of 8 nominal line voltages between 100 and 240 V, 50 or 60 Hz.


The ACOM 1000 HF Linear Amplifier is one
of the world's best value in an amateur HF amplifier. The ACOM 1000 gives you a
comfortable 1000 watts output on all amateur bands from 160 through
Easy to tune. The plate-load True Resistance
Indicator (TRI) is a powerful tuning aid which, together with the automatically
controlled input attenuator, helps the operator to quickly and precisely match
antennas (5-10 seconds typically). The auto-operate function (when enabled)
maintains the amplifier in OPERATE mode for you, thus saving manual operations
and time.
The amplifier will perform the functions
of an antenna tuner for VSWR up to 3:1, thus enabling you change
antennas faster and use them over a wider frequency range (saving tuning time).
An amplifier that is both user-friendly,
and that looks after itself. It is designed to safely withstand up to 500W
reflected power, up to 100 milliseconds duration of drive spikes, drive RF
"tails" after a PTT or KEY release, operator's inadvertent tuning
errors etc. It would also not cease to function with a "soft" AC line
and would deliver more than half power at only 75% of nominal mains voltage.
Withstands up to 10 milliseconds (down to zero) voltage drops, and up to +15%
line voltage spikes - important particularly when used at field days,
Dxpeditions, etc.
Text messages,12 parameters, and strip
peak-reading PEP meter displayed on a dot-matrix, back-lighted LC Display.
LED indicators are provided for OPERATE, attenuator-on, and ON/OFF conditions.
Signatures of the amplifier internal
status are stored in a nonvolatile memory for 7 most recent auto protection
trips. This information is used for diagnostics.
Silent QSK. The input bypassing and the vacuum antenna relays are
very quiet even in CW mode due to their special mounting.
Resulting in very good load to the
transceiver over the entire spectrum 1.8-54MHz.
A Svetlana 4CX800A (GU74B) high
performance ceramic-metal tetrode with plate dissipation of 800W is employed
(forced air cooling, grid-driven). Permanent monitoring and protection
of plate and grid voltages and currents, as well as of the exhaust temperature.
Technical
Specifications
·
Frequency
Coverage: All amateur bands 1.8-54MHz; extensions and/or changes on request.
·
Power
Output: 1000W PEP or continuous carrier, no mode limit.
·
Intermodulation
Distortion: Better than 35dB below rated output.
·
Hum
and noise: Better than 40dB below rated output.
· Harmonic
Output Suppression:
o 1.8-29.7MHz - better than 50dB below
rated output;
o 50-54MHz - better than 66dB below rated
output.
· Input
and Output Impedances:
o nominal value: 50 Ohm unbalanced, UHF
(SO239) type connectors;
o input circuit: broadband, VSWR less than
1.3:1, 1.8-54MHz continuously (no tunings, no switching);
o bypass path VSWR less than 1.1:1, 1.8-54MHz
continuously;
o output matching capability: better than
VSWR 3:1 or greater at reduced output levels.
·
RF
Gain: 12.5dB typically, frequency response less than 1dB (50 to 60W drive power
for rated output).
·
Primary
Power: 170-264V (200, 210, 220, 230 & 240V nominal taps, 100, 110 &
120V taps on request, +10%-15%tol.), 50-60Hz, single phase, 2000VA consumption
at rated output.
·
Complies
with CE safety and EMC requirements, as well as FCC-regulations (6,10 & 12m
bands lock provided).
·
Size
& Weight (operating): WxDxH: 422x355x182mm, 18kg.
· Operating
environments:
o temperature
range: 0...+50 degs.Celsius;
o humidity: up to 75% @ +35 degs.Celsius.
o height: up to 3000m above sea level
without output deterioration