AMERITRON ALS-500M Manuel d'instruction - Page 12

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ALS-500M

11. Plug the female multi-pin power connector onto the multi-pin male connector on the rear of the

ALS-500M chassis.

12. Reconnect the positive and negative battery leads to the battery.

Follow these instructions in numerical order. Consult the manual for the exciter, if necessary. Be sure

all electrical connections is properly wired and the vehicle is running with a fully charged battery. See

the Installation instructions for wiring details.

1. Set the ALS-500M front panel ON-OFF to OFF.

2. Set the amplifier's frequency range switch to the same frequency as the exciter. When using the

ALS-500RC, set the amplifier's frequency switch to the Remote position and the remote's

frequency range switch to the same frequency as the exciter.

3. With the amplifier still OFF transmit into the antenna with the exciter. Measure the SWR with the

transceiver's internal SWR indicator or with an external SWR indicator. Do not operate this

amplifier with an SWR greater than 2:1 or with more than 60 watts of reflected power. See the

"SWR Considerations" section on page 3.

4. Place the amplifier in the ON position with ALS-500RC remote on and amplifier off. The DC

AMPERES meter should increase slightly and the relay should "click" when the exciter is keyed.

5. Place the exciter in the transmit mode on CW, FM or RTTY. Gradually increase the output power

and observe the DC AMPERES meter. The current should be around 60 to 80 amperes at full

output. An external watt meter should indicate 400 watts or more of carrier power.

Full output levels of 400 watts CW should be obtained with drive levels of under 60 watts. Peak

envelope output levels on SSB may reach as high as 600 watts depending on voice and exciter

characteristics. The lowest IMD and splatter will be obtained if the amplifier is operated at an output

level slightly below the maximum level obtainable.

As the temperature rises the fan should start to run. If the temperature rises too far the THERMAL

OVERLOAD LED will light and the amplifier will not operate. This feature automatically resets

when the temperature reaches safe limits.

If the reflected power level is too high, the FREQUENCY selector is set to a cutoff frequency below

the transmission frequency, one PA section looses power, or the amplifier is overdriven, the LOAD

FAULT LED will light and the amplifier will not operate. The OFF-ON switch must cycled off to

reset the LOAD FAULT after the problem is corrected.

OPERATION

Instruction Manual