What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

الشرح

The final frequency is 146.52 / 12.21 = 12 times the oscillator frequency, and a multiplier multiplies deviation by the same factor, so the oscillator must deviate 5000 Hz / 12 = 416.7 Hz. Answering 5 kHz would ignore the multiplication entirely.