Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for CW reception? A. 500 Hz

B. 1000 Hz

C. 2400 Hz

D. 5000 Hz

Answer: option A = 500 Hz.

Explanation:

The full meaning of CW is continuous waveform or continuous wave. Continuous waveform during wireless telegraph radio transmission is also known as undamped waves. Around 1920, damped wave spark transmitters were replaced by continuous wave vacuum tube transmitters. Continuous waveform is some wave of constant amplitude and frequency.

Continuous waveform consists of a pure sine wave multiplied with a square wave that's either 0 or 1, corresponding to the keying of the carrier. Continuous waveform receive filters with passband around 500 Hz.