Discussion
Which quantity would be measured to check a transmitter's modulation linearity?
Answer: A
The sides of the trapezoidal display are straight when modulation is linear and curved when it is not, which makes the pattern the standard bench check for linearity as well as for index. Standing wave ratio tests the antenna and feeder. Frequency stability is an oscillator matter. And a receiver's output level depends on its own gain control and tells you nothing reliable about the transmitter's linearity.
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