ARRL Technician Practice Exam

Which of the following can be used to transmit CW in the amateur bands?

1. Keyers

2. Oscillators

3. Transceivers

4. All of these choices are correct

The correct answer is: All of these choices are correct

CW, or Continuous Wave, is a method of transmitting textual information over radio waves by turning the transmitter on and off. Each of the options listed provides a means to facilitate CW transmission, making the selection that includes all possible methods correct. Keyers are devices specifically designed to send Morse code automatically or manually. They provide operators with the ability to transmit CW signals efficiently, often speeding up transmission and reducing the chances of error compared to manual keying. Oscillators generate the radio frequency (RF) signals which are essential for CW transmissions. They produce the continuous wave that is modulated to create the necessary on-and-off keying that represents Morse code. Transceivers combine both a transmitter and a receiver in one device. They typically include built-in keyers and oscillators, providing all the necessary functions for effective CW communications on amateur bands. Since all of these devices play a vital role in transmitting CW signals, the inclusion of all the choices confirms the comprehensive nature of CW transmission capabilities.