A wideband FM signal is generated from a narrowband FM generator by Armstrong's indirect method as...

Transcribed Image Text:

A wideband FM signal is generated from a narrowband FM generator by Armstrong's indirect method as shown below. fo delta fo f1 delta f1 12 delta 12 fc delta f m(t) Frequency multiplier k1 Frequency multiplier k2 NBFM BPF to f LO The desired (target) carrier frequency, fc is 100 MHz and frequency deviation Af=75 kHz. The message signal to be broadcast is given by m(t) = cos (30,000rnt) The following information is given: fo=100 KHz, Afo=10 Hz and k1=150. Determine: a. Frequency multiplier k2. b. Carrier frequencies f1 and f2 and the corresponding frequency deviations Af1 and Δf2. c. The oscillator frequency , f LO. d. The center frequency and bandwidth of the bandpass filter. A wideband FM signal is generated from a narrowband FM generator by Armstrong's indirect method as shown below. fo delta fo f1 delta f1 12 delta 12 fc delta f m(t) Frequency multiplier k1 Frequency multiplier k2 NBFM BPF to f LO The desired (target) carrier frequency, fc is 100 MHz and frequency deviation Af=75 kHz. The message signal to be broadcast is given by m(t) = cos (30,000rnt) The following information is given: fo=100 KHz, Afo=10 Hz and k1=150. Determine: a. Frequency multiplier k2. b. Carrier frequencies f1 and f2 and the corresponding frequency deviations Af1 and Δf2. c. The oscillator frequency , f LO. d. The center frequency and bandwidth of the bandpass filter.