8.0 - FAULTS AND
FUNCTIONS
8.1 Soft Faults: Two conditions may cause soft faults...
a) Improper operating conditions, usually overdrive (and possibly excessive plate or grid current), high load
VSWR, or improper T/R control cable connections or timing.
b) Abnormal amplifier conditions (e.g., low bias) which may result in damage only in the transmit mode.
When such a condition occurs, the control system automatically switches the amplifier to STBY and the
appropriate FAULT LED illuminates to indicate the nature of the fault (see front panel pictorial).
To reset a soft fault...
a) Return the transceiver to receive
b) Switch the ALPHA 89 to STBY (standby)
c) Correct the condition that caused the fault
d) Return the ALPHA 89 to OPR (operate), and...
e) Resume transmission
8.2 Hard Faults: Failures such as HV shorts (extremely high plate current) or bias or control system failure result
in immediate shutdown of amplifier AC power to avoid damage.
To reset a hard fault...
After the cause of the hard (power-off) fault is found and corrected, simply press the ON button and wait for
warnrup time-delay to complete. Resume operation when desired.
8.3 ALC: No ALC connection normally is needed when using modern transceivers having smooth RF output
control. In the rare case where faults or distortion occur because transceiver output canno be well controlled it will
be necessary to contact the transceiver manufacturer for assistance to determine the correct technique to reduce
transceiver output. This may require adjustment of internal transceiver controls. See section 9, "overdrive-related
faults", for further information.
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