Why is it important to know the duty cycle of the mode you are using when transmitting?
To aid in tuning your transmitter
Some modes have high duty cycles that could exceed the transmitter’s average power rating✓Bonne réponse
To allow time for the other station to break in during a transmission
To prevent overmodulation
Explication
Modes such as RTTY, FM and the WSJT-X digital modes key the transmitter at full output continuously, so their average power can exceed what equipment rated for the low duty cycle of SSB speech or CW can safely dissipate.