Why should the ALC system be inactive when transmitting AFSK data signals?
ALC will invert the modulation of the AFSK mode
The ALC action distorts the signal✓Bonne réponse
When using digital modes, too much ALC activity can cause the transmitter to overheat
All these choices are correct
Explication
AFSK data uses a constant-amplitude tone, so if ALC acts it varies gain dynamically during transmission and distorts the signal, spreading nonlinear mixing products into adjacent frequencies. Drive should be set low enough that the ALC circuit never acts at all.