which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?
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Visual inspection of the transmitter (control settings, signs of physical damage or overheating, etc.)
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Power supply testing with a DVM to ensure all prescribed operating voltages are within acceptable limits.
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Correct Answer
Modulation testing with a RF spectrum analyzer to measure frequency deviation in the transmit mode.
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Input/Output checks with a 10:1 oscilloscope probe to identify any points of severe signal degradation.