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ACOM 1000 amplifier review PDF Print E-mail
ACOM 1000 amplifier
ACOM 1000 amplifier

The ACOM 1000 HF linear amplifier gives you a comfortable 1000 watts output on all amateur bands from 160 through 6 meters. It uses a single 4CX800A (GU74b) high performance ceramic-metal tetrode. Amplifier is fitted into the metal box with dimensions 422x355x182mm. Weight is 22kg.

On the front panel is an electronic ON/OFF switch, TUNE and LOAD knobs, band switch. Below the LCD display are three push-buttons (OPER, PREV and NEXT) and two LEDs. ACOM 1000 doesn’t have needle indicators, all values are showed on the LCD display.

4CX800A tube On the rear panel is a main power cord, main switch, two fuse holders, KEY IN and KEY OUT connectors, GND screw, RF input and RF output SO-239 connectors. There is a large hole with fitted fan.

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:
   -1.8-29.7MHz - better than 50dB below rated output;
   -50-54MHz - better than 66dB below rated output.
Input and Output Impedances:
   - nominal value: 50 Ohm unbalanced, UHF (SO239) type connectors;

   - input circuit: broadband, VSWR less than 1.3:1, 1.8-54MHz continuously (no tunings, no switching);
   - bypass path VSWR less than 1.1:1, 1.8-54MHz continuously;
   - 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, 22kg.
   -(16.6x14x7.2 inches, 48.5lbs)
Operating environments:
   - temperature range: 0...+50 degs.Celsius;
   - humidity: up to 75% @ +35 degs.Celsius.
   - height: up to 3000m above sea level without output deterioration


ACOM 1000 cover removed
ACOM 1000 cover removed

Power supply board
Power supply board

FEATURES
The amplifier will perform the functions of an antenna tuner for SWR up to 3:1, thus enabling you change antennas faster and use them over a wider frequency range (saving tuning time). I found it alsp very useful when operate with a wire antennas in the strong wind. The SWR of these antennas has changed every second – but the ACOM 1000 still delivers full power.

Tunning is easy, especially when you pre-tune the amplifier. 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).

I have worry about the tunnig without the needle indicators. With a peak-reading PEP meter on the LCD display I was able to tune the amplifier within few seconds. When pushing the button NEXT below the LCD I can check all important values (voltage, currents, temperature, tune/load,...).

Inside the ACOM 1000 amplifier
Inside the ACOM 1000 amplifier

The tube warm-up time after turning ON is 2.5 min. When operating around 1kW was the temperature of exhausted air 74°C. The reports were good, nobody has reported splatters. When running multi-multi station we have add a coaxial stubs on the output (acts like a harmonic notch filters). Without them there was a significiant 2nd harmonic.

Finally – ACOM 1000 is a well designed power amplifier. The price is appropriate to the amplifier performance and quality. More about ACOM 1000 you will find on the ACOM website
 
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