Which of the following complies with commonly accepted amateur practice when choosing a frequency on which to initiate a call?
Listen on the frequency for at least two minutes to be sure it is clear
Identify your station by transmitting your call sign at least 3 times
Follow the voluntary band plan✓Правильный ответ
All these choices are correct
Объяснение
Voluntary band plans divide each band by mode and activity within the segments the rules allow, and observing them is what accepted practice asks of you. Fixed listening times and repeating your call three times are not requirements, so the combined choice fails.