What is the purpose of a Continuous Wave (CW) signal?

A Continuous Wave (CW) signal serves a fundamental role in radio communication, particularly in distress situations. This type of signal is generated by turning a radio transmitter on and off, producing a series of on-off keying that represents Morse code. This method is simple yet effective, allowing for clear transmission even in challenging conditions where voice communication might be difficult due to noise or interference.

The use of CW is especially critical in emergency situations, as it can be easily recognized and decoded by operators trained in Morse code. This means that it can convey distress signals (like SOS) over long distances, making it an essential tool for mariners and aviators who may find themselves in perilous situations at sea or in the air.

In contrast, the other options refer to functions that are beyond the scope of CW signals. While data transmission, video transmission, and audio clarity improvements are essential aspects of modern communication technologies, they do not align with the primary purpose of Continuous Wave signals, which is focused on basic and reliable radio communication, especially for distress scenarios.