A block diagram of a typical FM receiver, covering the broadcast range of 88 to 108 MHz, is shown in Fig. 4-16. The IF amplifier frequency is 10.7 MHz. The limiter is used to remove the amplitude fluctuations caused by channel imperfection. The FM receiver is tuned to a carrier frequency of 100 MHz.
(a) A 10-Hz audio signal frequency modulates a 100-MHz carrier, producing β = 0.2. Find the bandwidths required for the RF and IF amplifiers and for the audio amplifier.
(b) Repeat (a) if β = 5.