Q1) Consider a system that FM modulates a carrier of frequency fc = 100 MHz carrier with a message signal of 15 kHz. The
Posted: Sun May 15, 2022 7:43 pm
Q1) Consider a system that FM modulates a carrier of frequency fc = 100 MHz carrier with a message signal of 15 kHz. The modulation index is ß = 4. (a) Estimate the bandwidth of the transmitted signal. [3 marks] (b) Consider the FM transmitter based on Armstrong's indirect method with three frequency-doubling stages in Fig. Ql. Determine the carrier frequency fé and modulation index B' for the NBFM system to yield the above fc and B. [4 marks] f' and B' NBFM FM signal Fig. 21 frequency doubler frequency doubler frequency doubler