Acom 3x2000A Manual de instrucciones - Página 8

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3. OPERATION

Before you turn the splitter / combiner on, at least 2 hours should have expired since it was

brought in and unpacked in the room where it will be used. Pay particular attention when you

move it from a very cold into a very warm place - condensation is likely and this could result in

damage to the high voltage circuits. In such a case, wait at least 4 hours. A similar effect can occur

after a rapid warming of the operating room (for instance after switching on a powerful heater).

After following all instructions in S.2, you can plug the supplied 12V wallwart power supply into the mains outlet. The

green LED on the front panel must light, showing that the device is turned ON and READY.

Turn the amplifiers ON and in OPERATE mode.

After having put together the system and before use, you should prepare user tunings on each ACOM2000A amplifier

separately for the bands, segments, and antennas, which will be used. These tunings will be automatically and

simultaneously retrieved from each ACOM2000A memory later when you change the operation frequency or

antennas.

The user tuning should be done in the following way (see also ACOM2000A Operating manual, S. 4-2):

The three amplifiers should be turned on the same frequency segment and in OPERATE mode;

Press the TUNE button on the first amplifier's RCU;

Apply between 10 and 20 W continuous (CW) drive from the transceiver;

The tuning will be completed in few seconds and simultaneously the splitter / combiner protection will trip;

Remove the drive power and press RESET button on the splitter / combiner front panel;

Repeat the same steps successively on the second and the third amplifier;

The same procedure should be applied on every frequency segment / antenna combination, which will be used.

In case of manual tune amplifiers, each of them should be re-tuned precisely each time you change a band and/or

antenna.

Now you can start operating in the same manner as if you are operating a single amplifier.

Should the protection circuit trip most likely the amplitude or phase difference between the outputs of any two

amplifiers is too high. One of the red LEDs will light, identifying the amplifier, which most likely produced the

imbalance. Stop the transmission, check the status of the amplifier identified, its connections, and then the settings and

tunings of all amplifiers. If everything is in order but the problem persists, reduce the drive power and check the

transceiver for leading RF spikes. Apply constant ALC biasing to the transceiver ALC input in case of spikes. Finally

press the RESET button to resume the operation.

4. MAINTENANCE

4-1. Cleaning

Do not use solvents for cleaning - they may be dangerous both for you and for the

splitter / combiner paint.

Do not open the splitter / combiner. Cleaning can be done with a piece of soft cotton cloth lightly moistened with

clean water.

C A U T I O N

W A R N I N G