Which of the following is an essential requirement of a CW transmitter?

A continuous wave (CW) transmitter is designed to generate an unmodulated carrier wave and is fundamental in radiocommunication, especially in amateur radio and for Morse code transmissions. Understanding the essential components helps clarify why all the listed elements are crucial for its operation.

An oscillator is key to generating the continuous wave signal. It creates the specific frequency required for transmission, producing the unmodulated carrier wave that is characteristic of CW communication. This is a fundamental requirement because without an oscillator, there would be no signal to transmit.

In addition to the oscillator, a microphone may be used in certain configurations where audio signals need to be coupled to the transmitter for modulating the wave or for encoding information in telegraphy. Though not always utilized in all CW setups, it can play a role in the broader context of audio and CW interaction.

The buffer amplifies and isolates the oscillator output from the load it drives, ensuring that the transmitter can maintain its signal integrity while protecting the oscillator from variations in impedance and other circuit influences.

These components—oscillator, microphone, and buffer—work together to ensure that the CW transmitter can effectively produce a reliable signal for communication. Therefore, the comprehensive operation of a CW transmitter does indeed reflect the necessity of all the aforementioned