Hams sometimes used Audio Frequency Shift tones modulated on to an AM carrier as a temporary way of getting on air with an old style AM transmitter. Which of c

Hams sometimes used Audio Frequency Shift tones modulated on to an AM carrier as a temporary way of getting on air with an old style AM transmitter. Which of course meant two sets of sidebands (eg four in total) and a excessively wide signal.. But any of the better quality transmitters (Ham, Commercial or military) used pure FSK directly.