Which of the following describes a linear amplifier?
Any RF power amplifier used in conjunction with an amateur transceiver
An amplifier in which the output preserves the input waveform✓پاسخ درست
A Class C high efficiency amplifier
An amplifier used as a frequency multiplier
توضیح
Linear means the output is a scaled copy of the input, preserving the shape and the amplitude relationships of the waveform. A Class C stage deliberately conducts for part of the cycle and distorts the envelope, so it is not linear, and being connected to a transceiver does not make an amplifier linear.