BasicB-003-004-005
In a basic CW transmitter, what does the power amplifier stage do?
D
Answer
Basic radio theory
Type
A
It removes CW chirps from the transmitted signal
B
It reduces distortion in the transmitted signal
C
It multiplies the oscillator frequency to the operating frequency
D
It increases the transmitter's output power
Answer Notes
The primary purpose of a power amplifier (PA) in any transmitter is to take a relatively weak radio frequency (RF) signal from the preceding driver or buffer stages and boost it to a much higher power level. This amplified signal is then sent to the antenna for transmission.
Without a power amplifier, the signal generated by the oscillator and buffer would be too weak to travel significant distances. The PA provides the necessary electrical "muscle" for the radio wave to propagate to distant receivers.
The power amplifier does not multiply the frequency, reduce distortion, or remove chirps. In fact, if not designed and tuned correctly, a power amplifier can actually introduce distortion or amplify existing flaws in the signal.
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