the line voltage with an accurate meter and make sure the power supply primary
wiring is correct. The ALS-600SPS should be between 49 to 51 volts at this step.
5. Set the ALS-600 frequency range switch to the same frequency as the exciter.
6. With the amplifier still in STANDBY, transmit into the expected 50 ohm RF load
with the exciter. Measure the SWR on the amplifier's SWR scale or with an external
SWR indicator.
Caution: Do not operate this amplifier at full power with an SWR above 2:1. See the
SWR Considerations section.
7. Place the amplifier in the OPERATE position. The TRANSMIT LED should light
when the exciter is keyed. With no RF drive, the idling current should be less than 1
amp on the power supply meter.
8. The ALC control is properly adjusted if the ALC LED just flashes when the desired
peak output power is reached. The audio or power output control on the exciter can
be adjusted to control how "heavily" the ALC is used. The higher the exciter power
(gain) control is adjusted, the more compression the ALC circuit provides.
The best signal quality occurs when the ALC LED occasionally flashes. The most SSB
signal "punch" will occur if the LED continuously flashes.
Full output levels of 500 watts CW should be obtained with drive levels of under 100
watts. Peak envelope output levels on SSB may reach as high as 800 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.
ALS-600 Remote Control Operation and Automatic Band
Tracking
ALS-600 amplifiers with Serial Number 14378 and higher include the capability for
remote control and automatic band tracking using the optional ALS-500RC Remote
Control Head, and ARI-500 Automatic Band Switch.
ALS-500RC Remote Control Operation
The optional Ameritron ALS-500RC Remote Control Head allows the amplifier to be
located away from the operating position, yet still provides access to the amplifier’s
frequency selection and Fault re-set function. The ALS-500RC also provides a RF output
meter (power output equals 10x the reading), and LEDs to indicate DC PWR, TX
(transmit) and O/L (fault/overload). The ALS-500RC connects to the ALS-600 via the
two REMOTE RJ45 jacks on the front of the amplifier. Keying of the amplifier can be
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