Version 0A 20
Most non-amateur services prohibit use of non-commercial radio equipment. This
amplifier automatically prevents operation between 25 and 28 MHz. Operation in the 25-
28 MHz range is not available with this product, irrespective of licensing or end-use.
Warning Lights
The ALS-606 has two primary warning lights in the center of the front panel, SWR and
PA. When SWR or PA warnings illuminate from an operating fault the amplifier defaults
to a forced bypass mode. Operational faults and the forced bypass reset by placing the
amplifier in standby.
ALC: The yellow ALC light is at the far left of the warning light cluster, next to the ALC
control. The yellow ALC light is not a fault indicator. The ALC light indicates ALC output.
Occasional flashing is normal with properly adjusted ALC. An almost steady ALC light
generally indicates too much ALC.
TX: The TX indicator illuminates steady green when the amplifier is “keyed” or in the
transmit mode.
The SWR and PA indicators serve exclusively as warnings. The SWR and PA, in
conjunction with TX and Band indicators, flash in certain “codes” to indicate severe
operational problems.
The following table applies to faults:
Warning
light Steady
Warning
light Flash
Fault Cause or Cure
SWR TX Antenna Reflected
Power
High antenna SWR or
intermittent antenna or feed line
connection
SWR, PA Band Wrong filter
Filter input SWR
Exciter or amplifier on
incompatible band, filter failure
PA, TX PA FET too hot Excessive power for duty cycle
or SWR, lack of proper airflow
10M, PA,
TX
Illegal 11 meter Excessive 27 MHz signal level
REM, PA No data or bad band
data when on remote
Defective or improper remote
cable, or bad radio band data
information
Table 3 LED Alarm Indicators
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