. The Colpitts crystal oscillator for the carrier frequencies: 1.1. fm(@C1)- 100 Khz- is due on...
(a) Design (the block diagram of) an Armstrong indirect FM modulator to generate an FM carrier with a carrier frequency of 98.1 MHz and Af 75 kHz. A narrowband FM generator is available at a carrier frequency of 100 kHz and a frequency deviation Af = 10 Hz. The stockroom also has an oscillator with an adjustable frequency in the range of 10 to 11 MHz There are also plenty of frequency doublers, triplers, and quintuplers. (b) Determine the tunable...
14. Given a sinusoidal modulating signal with frequencies f," 10 kHz and a carrier signal of 100 MHz, determine the bandwidth of FM for the three cases (amplitudes: 1. 10, 100, 1000) when the maximum frequency deviation is 50 kHz and k,-2? × 100 rad/sec/volt.
8.4 Mixers 8.21* An AM signal is transmitted on an 800-kHz carrier. The baseband frequency range extends from 100 Hz to 5 kHz. This signal is to be detected by a superheterodyne receiver with a 55-kHz intermediate frequency. (a) What is the frequency of the local oscillator? (b) What must be the Q of the IF stages if the 1-dB points are to correspond to the maximum and minimum frequencies of the IF signal?