Total posts : 45366
Normally an AFC circuit (whether drifty or not) was included only in older generation FM broadcast receivers using analog tuning, and were not necessary, or used in AM broadcast receivers. Modern FM receivers using digital tuning don’t need/use them, either.
But the question is, HOW wide do we dare put out?
Most, modern, monaural, analog AM broadcast receivers do not reproduce audio frequencies greater than about 4-5 kHz — so there would be no great benefit in transmitting them.