Alpha 8100 Operating Manual page 49

2) Possible damaged or defective tube(s).
Receive signals disappear or are severely attenuated when switching from STBY to
OPR.
Problem
1) RELAY (T/R) control cable from transceiver is
shorted.
2) Transceiver locked in transmit
Plate current indicated when amplifier is in STBY or receive.
Problem
1) 4CX800A/GU74b tube heater-to-cathode
leakage or short.
2) Tube bias supply or T/R bias switch faulty.
Distorted SSB signal; possible severe television interference.
Problem
1) Excessive RF drive from transceiver and/or
insufficient amplifier loading.
2) Coaxial connector, coax feedline, antenna
feedpoint balun, tuner, or antenna trap arcing
on voice peaks.
3) RF feedback from antenna into transceiver
via the transceiver power cord, microphone or
key cable, or other unshielded station patch
cables.
4) Poor station RF ground.
Low frequency (60 Hz) audio hum on transmitted signal.
ALPHA 8100 OPERATING MANUAL
www.alpharadioproducts.com
Contact Alpha Customer Service.
Correction
Check T/R control cable to make sure it is
switching properly. Replace if needed.
Make sure transceiver is properly switching
between transmit and receive. See
transceiver's User's Manual for assistance.
Correction
Contact Alpha Customer Support.
Contact Alpha Customer Support.
Correction
Decrease drive from transceiver. Re-check
amplifier tuning.
Make sure all power cords, microphone
and key cables, or other cables are properly
shielded and grounded.
Be sure the amplifier and transceiver have a
proper RF ground. Correct if necessary.