The ACOM 1200S is an advanced solid-state RF linear power amplifier designed for demanding amateur radio operators who require high output power, excellent reliability, and straightforward operation. Covering all amateur radio bands from 1.8 to 30 MHz and the 6-meter band (50–54 MHz), it delivers 1000W of rated RF output power, either PEP or continuous carrier, without operating-mode restrictions.

Combining modern LDMOS power transistor technology, intelligent electronic control, automatic band switching, and comprehensive protection systems, the ACOM 1200S provides outstanding versatility for amateur radio applications.

Its broadband RF input, automatic operation, and integrated switching-mode power supply make it an excellent solution for permanent amateur radio stations, remote-controlled installations, portable operations, and DXpeditions.

Advanced LDMOS Power Amplifier Technology

The final RF amplification stage utilizes a high-performance LDMOS power transistor, type BLF188XR or equivalent, designed to operate reliably under demanding high-power conditions.

With an RF power gain of 14 dB ±1 dB, the amplifier typically requires only approximately 40W of drive power to deliver its rated 1000W output.

The broadband input circuitry maintains an SWR below 1.2:1, typically 1.1:1, throughout the 1.8–54 MHz frequency range, eliminating the need for manual input tuning when changing operating bands.

Excellent linearity is achieved with third-order intermodulation distortion better than 31 dB below rated PEP output. Harmonic and unwanted emission suppression exceeds 60 dB, typically reaching 65 dB, contributing to a clean transmitted signal.

Automatic Band Switching and Simplified Operation

The ACOM 1200S is designed to integrate easily with modern amateur radio transceivers.

When connected through a compatible CAT interface, the amplifier continuously tracks the transceiver's operating frequency and automatically selects the corresponding amateur radio band.

For transceivers without CAT connectivity, the amplifier features a built-in frequency counter that identifies the incoming RF signal frequency and enables automatic band selection.

No manual RF tuning or adjustment of the amplifier's matching circuits is required when changing bands.

The amplifier can operate with transceivers from different manufacturers, requiring only an appropriate RF drive signal and a standard ground-on-transmit PTT control connection.

High-Resolution 5-Inch Color Display

The front panel incorporates a high-resolution 5-inch color LCD display with 800 × 480-pixel resolution and 24-bit color depth.

Its intuitive graphical interface provides clear, real-time operating information, including:

• Forward and reflected RF power.

• RF drive and output power.

• Antenna standing wave ratio (SWR).

• Power amplifier temperature.

• Power amplifier DC voltage and current.

• Operating frequency band and amplifier status.

• Protection warnings and diagnostic information.

Six front-panel control buttons provide convenient access to operating functions, settings, and configuration menus.

Intelligent Protection and Fault Diagnostics

The ACOM 1200S incorporates a comprehensive multi-level protection system that continuously monitors critical operating parameters.

The amplifier supervises RF drive power, reflected power, antenna SWR, transistor current, supply voltages, and temperatures throughout the RF power stage and power supply.

Depending on the severity of an abnormal operating condition, the protection system can issue warnings, temporarily interrupt transmission, or initiate a protective shutdown.

An advanced diagnostic memory records 55 operating parameters for each of the last 28 hard-fault events, making troubleshooting and maintenance considerably easier.

This intelligent monitoring system helps protect the amplifier against potentially damaging operating conditions.

Integrated Switching-Mode Power Supply with PFC

The ACOM 1200S features a built-in switching-mode power supply (SMPS), supporting 100–240V AC, 50/60 Hz operation without manual voltage selection.

Its integrated Power Factor Correction (PFC) circuitry provides a power factor of 0.95 or higher while improving compatibility with different electrical supply conditions.

The amplifier delivers its full rated 1000W RF output when operated from a suitable 200–240V AC supply.

When the AC supply voltage falls below 200V, the available RF output power is reduced to approximately 500W.

Power consumption in Low Energy Waiting mode remains below 1 VA.

The wide input voltage range and inrush-current limiting also make the amplifier suitable for operation from properly rated portable power generators.

Remote Control and Station Integration

The ACOM 1200S provides an RS-232 interface for serial communication and remote control.

Internet and Ethernet-based remote operation are available through the optional ACOM eBox Ethernet Remote Control Device, enabling integration into remotely operated amateur radio stations.

The amplifier also supports compatible ACOM automatic antenna tuner systems, including the ACOM 04AT and ACOM 06AT.

These optional accessories allow automatic antenna matching and convenient management of multiple antennas through the amplifier's control system.

Compact Construction and Electromagnetic Compatibility

Despite its high RF output capability, the ACOM 1200S features a compact enclosure measuring only 372 × 418 × 162 mm and weighing 16 kg.

Its cooling system, continuous thermal monitoring, integrated power supply, and extensive RF filtering are designed to support reliable operation while minimizing electromagnetic interference with other station equipment.

The amplifier meets applicable European CE safety and electromagnetic compatibility requirements and complies with relevant FCC regulations.

The ACOM 1200S is an excellent choice for amateur radio operators seeking a modern, powerful, and highly automated RF amplifier with extensive protection, simplified operation, and remote-control capabilities.

Technical Specifications

Parameter	Specification
Manufacturer	ACOM
Model	ACOM 1200S
Amplifier Type	Solid-State RF Linear Power Amplifier
Final Stage Technology	LDMOS, BLF188XR or equivalent
Frequency Coverage	Amateur bands within 1.8–54 MHz
Supported Amateur Bands	160, 80, 60, 40, 30, 20, 17, 15, 12, 10 and 6 meters
Rated RF Output Power	1000W ±0.5 dB
Output Power Rating	PEP or continuous carrier
Operating Modes	SSB, CW, AM, FM and digital modes, within specified operating limits
RF Drive Power	Approximately 40W typical, less than 50W
RF Power Gain	14 dB ±1 dB
Third-Order Intermodulation Distortion	Better than -31 dB relative to rated PEP
Harmonic and Spurious Suppression	Better than 60 dB, typically 65 dB
Input / Output Impedance	50 ohms, unbalanced
Input SWR	Below 1.2:1, typically 1.1:1
RF Bypass SWR	Below 1.1:1
Maximum Antenna SWR at Full Output	1.5:1
Maximum Acceptable Antenna SWR	Up to 3:1 with proportional power reduction
RF Input / Output Connectors	UHF SO-239
Transmit / Receive Control	KEY-IN / KEY-OUT, RCA connectors
Minimum PTT-to-RF Sequencing Time	10 ms
Automatic Band Switching	CAT interface or internal frequency counter
Front Panel Display	5-inch color LCD, 800 × 480 pixels, 24-bit
Local Controls	Six front-panel buttons
Communication Interfaces	CAT/AUX, RS-232
Internet Remote Control	Optional ACOM eBox
Protection System	Multi-level electronic monitoring and protection
Fault Diagnostic Memory	55 parameters for each of the last 28 hard-fault events
Power Supply Type	Integrated SMPS with PFC
AC Input Voltage	100–240V AC, 50/60 Hz, single phase
RF Output Below 200V AC	Approximately 500W
Power Factor	≥0.95
Maximum Apparent Power at 1000W RF	Up to 2100 VA from 200/240V AC mains
Maximum Apparent Power at 500W RF	Up to 1100 VA from 100/120V AC mains
Low Energy Waiting Consumption	Less than 1 VA
Operating Temperature	-10°C to +40°C
Operating Relative Humidity	Up to 95% at +35°C
Maximum Operating Altitude	3050 m without output degradation
Dimensions (W × D × H)	372 × 418 × 162 mm
Weight	16 kg
Regulatory Compliance	CE, FCC
FCC Identifier	2AJXZ1200S
Country of Manufacture	Bulgaria

Optional Accessories

• ACOM 06AT: Automatic antenna tuner with four-way antenna switching.

• ACOM 04AT: Remote automatic antenna tuner with antenna switching.

• ACOM eBox: Ethernet / Internet remote-control interface.

• ACOM L-PROT 2000: Lightning-induced surge protection accessory.

Important: The antenna tuner and Ethernet remote-control device are optional accessories and are not integrated into the standard amplifier. Transmission must comply with the applicable national amateur radio frequency allocations, power limits, and licensing regulations.