What tool do many amateurs use to help improve Morse code character transmission?

An electronic keyer is a tool commonly used by amateur radio operators to enhance their proficiency in Morse code character transmission. It provides a method to send Morse code more accurately and consistently than manually sending it with a straight key. The electronic keyer typically allows the operator to input characters at a comfortable speed, which is especially beneficial for practicing at higher speeds.

By utilizing the electronic keyer, operators can adjust the timing and speed of the dashes and dots, making it easier to focus on the practice of receiving and sending Morse code. This feedback and control can significantly help in developing muscle memory and improving overall Morse code skills.

Other tools like manual keys or sound oscillators may also play a role in Morse code operation, but they do not offer the same level of assistance in terms of speed and accuracy during practice. A signal generator is primarily used for testing and generating signals rather than for practicing Morse code transmission directly.