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ACOM 1003 | HF + 6 m Linear Amplifier

ACOM 1003 | HF + 6 m Linear Amplifier


Usage
ACOM 1003 is a self-contained, full-featured linear amplifier covering all amateur bands from 1.8 MHz to 54 MHz. It delivers 1000 W power output PEP or 900 W continuous carrier, with less than 80 W input power.

Easy to operate
Antenna matching is made simple by the True Resistance Indicator (TRI) which is a bar scale for accurate setting of the plate-load impedance real part. A front-panel button-controlled input attenuator allows for easy drive power reduction during tuning and restoration after that, without the need of transceiver re-adjustments. Peak power bar graph indicator, operational parameters and text messages are displayed during operation on a two-line OLED display. Switching RX/TX is fast and CW QSK compatible, using a silent HF reed relay.

No external antenna tuner needed
No need of external antenna tuner (ATU) for antenna SWR up to 3. A SWR up to 3 is allowed at 1000 W forward output to the antenna.

User-friendly and durable

  • Operator selectable class AB2 mode for best linearity in SSB mode or class B for reduced plate dissipation in continuous digital modes;
  • Operator selectable modes of full or 50% reduced power output with no efficiency deterioration;
  • Auto controlled cooling air flow;
  • Continuous monitoring of amplifier parameters and tube protection;
  • Able to monitor 18 operator-selectable amplifier parameters on the display;
  • Unique ACOM protection for the bands switch (BAND);
  • Original ACOM TRI prompt: bar scale for quick and accurate setting of the plate-load impedance real part while matching the antenna;
  • Factory tuned input lowpass filters for best linearity and input SWR less than 1.3 in each amateur radio band.

OLED comment display
Two-line OLED display with peak-reading forward-output power bar graph and 18 operator-selectable amplifier parameters on the display.

Three antenna outputs
Three antenna outputs are selectable by a push-button on the front panel.

Less noise in the shack
HF antenna reed relay for a virtually silent, QSK compatible CW operation.

Transceiver-independent
The amplifier operates without special signals from the transceiver - "Ground on TX" (PTT) and 50-80 W RF drive power are sufficient.

Single tube operation
Uses a single ceramic/metal power triode 3CX800A7 in cathode driven, grounded grid configuration.

Tube protection
Continuous monitoring of amplifier parameters and tube protection.

Output RF arc protection
Original ACOM HF arc protection at the output, or at the antenna.

Power supply
Single phase mains power, 90-132 / 180-264 VAC at 50-60 Hz, power consumption at rated output – up to 2000 VA @ 240 VAC.

Easy maintenance
Non-volatile memory with SIGNATURE records of the most recent 8 Serious (Hard Fault) Protection events.

Documentation
The User's Manual is available as a PDF file only. The latest version is available under the Download tab (see above).
ACOM creates and distributes its documentation in ENGLISH language only. If you need a User's Manual in your local language, please contact your dealer.

Warranty terms
The ACOM Terms of Business (General Conditions of Sale and General Service Conditions) are available as PDF files under the Support -> Terms of Business menu.
By purchasing ACOM products, the Customer (Dealer or End User) declares acceptance of the above-mentioned ACOM Terms of Business.


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Frequency Coverage

  • All amateur bands in the 1.8-54 MHz frequency range:
    • 1.800 - 2.000 MHz (160 m band)
    • 3.500 - 4.000 MHz (80 m band)
    • 5.250 - 5.450 MHz (60 m band)*
    • 7.000 - 7.300 MHz (40 m band)
    • 10.100 - 10.150 MHz (30 m band)
    • 14.000 - 14.350 MHz (20 m band)
    • 18.068 - 18.168 MHz (17 m band)
    • 21.000 - 21.450 MHz (15 m band)
    • 24.890 - 24.990 MHz (12 m band)
    • 28.000 - 29.700 MHz (10 m band)
    • 50.000 - 54.000 MHz (6 m band)*
      (*) Please, refer the applicable regional band plans and laws for specific allocations and limitations.

Power Output

  • 1000 W PEP or 900 W continuous carrier, with no limitation to the operating mode;
  • In continuous carrier modes (RTTY etc.) for transmissions longer than 5 minutes, the external auxiliary fan must be mounted;

Intermodulation Distortion at rated power

  • Better than 34 dB IMD3 with regard to one of the two tones (40 dB below PEP);

Hum and noise

  • Not more than 4,5% (-27 dB) AM depth at rated power;

Harmonic Emissions Output Suppression

  • 1.8-29.7 MHz - better than 50 dB below rated power;
  • 50-54 MHz - better than 70 dB below rated power;

Input and Output Impedances

  • Nominal impedance: 50 Ω unbalanced, UHF / PTFE coaxial connectors (SO-239A);
  • Input circuit: factory tuned low-pass filters for best linearity and input SWR not more than 1.3 in every amateur band from 160 m to 6 m;;
  • Bypass path SWR: not more than 1.1 continuously from 1.8 to 54 MHz;
  • Minimum range of impedance matching capability at the output: all loads with SWR up to 3* at any phase angle;
    (*) The drive power must be reduced at SWR above 3 in order to keep the Reflected Power under 250 W.

HF Power Gain

  • 12 dB ±1 dB (50 W - 80 W at the input for rated output power);

Mains Power Supply Voltage

  • 90-132 VAC / 180-264 VAC (taps for 8 nominal voltages: 100, 110, 120, 200, 210, 220, 230 & 240 VAC, ±10% tolerance), 50-60 Hz, Single phase;

Mains Power Consumption

  • 2000 VA @ at 240 VAC;

Safety and Electromagnetic Compatibility

  • Complies with European Union's CE safety and electromagnetic compatibility requirements;
  • Complies with the US Federal Communications Commission (FCC) regulations - FCC Identifier: 2AJXZ1003, Date of Grant: 03 June 2025;

Size & Weight (operating, excluding connected cables)

  • WxDxH: 423x398x195 mm, 21.0 kg (16.7x15.7x7.7 inches, 46.3 lbs.);

Shipping Size & Weight

  • WxDxH: Approx. 632x583x413 mm, 25.0 kg (24.9x23.0x16.3 inches, 55.1 lbs.);
  • Please, contact us for shipment details;

Operating environments

  • Temperature range: 0 to +50 degrees Celsius (32 degrees F to 122 degrees F);
  • Relative air humidity: up to 95% @ +35 degrees Celsius (95 degrees F);
  • Height above sea level: up to 3050 m (10000 ft) without output deterioration.

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There are several individual purchase options available:

  1. ACOM L-PROT 2000 | Lightning Protector
  2. External fan
  3. Shipping cardboard box
  4. Coffee/tea mug :-)

    1  |  The ACOM L-PROT 2000 lightning protection is a critically important option for your ACOM 1003 amplifier.



    2  |  For higher-duty cycles such as continuous broadcast or increased ambient temperature, additional fan use is recommended. The auxiliary fan is a brushless type, 2 to 5 W, 24 VDC, size 92x92x25 mm. It may be installed by your dealer or by the manufacturer on request. ACOM recommends a fan ordering, if you need it, with the purchase of a new amp.
    The fan is not necessary in SSB and CW modes, nor in continuous carrier modes (RTTY, SSTV, etc.) for a maximum times of continues transmission up to 15 minutes followed by pause of at least 3 minutes.

    3  |  If you need to ship the amplifier and you don't have the original packaging, this cardboard box is your solution. This is the same packaging that ACOM used to package every new product. It is actually a double box and comes with all the internal supports. For packing instructions for your product see ACOM User's Manual.



    4  |  The ACOM coffee/tea mug is your amp's most important option.
    This is the only guarantee for successful DXing and a happy life :-)



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