ECE405HW5Su2010

# ECE405HW5Su2010 - ECE 405 HOMEWORK#5 SUMMER 2010 DR JAMES S...

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ECE 405 HOMEWORK #5 SUMMER 2010 ©DR. JAMES S. KANG 1 In the indirect FM transmitter shown below, find the multiplication factor and the crystal oscillator frequency LO f so that the output frequency is 99.6 MHz and the maximum frequency deviation is 75 kHz. NBFM generator Frequency multiplier Frequency multiplier × 60 × ( ) Oscillator f c 1 =200kHz Δ f 1 =25Hz f c =99 .6MHz Δ f=75kHz 2 In the circuit shown below, assume that () Ck m t = − where and 15 3.351 10 k ( ) 6cos(2 1,000 ) mt t π . Also assume that 1 2 Cp F = and 5 Lm H = . (a) What is the carrier frequency c ω in rad/s? (b) What is the frequency deviation constant f k ? (c) What is the modulation index? + Oscillator C FM Wave m(t) L C 1 3 Twelve audio signals, whose bandwidths are each 16 kHz, are frequency division multiplexed on subcarrier frequencies at 200, 400, 600, . ......... kHz by using frequency modulation. The combined signal is then again frequency modulated for transmission through a microwave link whose band is centered at 600 MHz. (a) Find the largest β for each of the first stages of subcarrier modulation.

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## This note was uploaded on 08/09/2010 for the course ECE ECE 405 taught by Professor Jameskang during the Summer '10 term at Cal Poly Pomona.

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ECE405HW5Su2010 - ECE 405 HOMEWORK#5 SUMMER 2010 DR JAMES S...

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