5. An SSB transmitter with a carrier of 2.3 MHz is modulated by an intelligence signal in the 150-Hz to 4.2-kHz range. Calculate the frequency range of the lower sideband.

Problem 1: The message signal m(t) = sin (1000nt) angle modulates the carrier signal c(t) = cos(10000nt). %3D (a) Find an FM modulated signal when kf = 100 (b) Find a PM modulated signal when k, = 10 (c) Determine the modulation index and maximum frequency deviation of FM modulated signal. (d) Determine the modulation index and maximum phase deviation of PM modulated signal.

m(1) A block diagram of an indirect (Armstrong) frequency modulation (FM) transmitter is shown in below. Let fi=100KHz, and the frequency deviation Afi=10HZ at the input of this indirect transmitter, and the local frequency is flo=8.5MHz. Evaluate ni and n₂ to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. NBFM A/₁ Frequency multiplier X ₁ f₂ A/₂ ~fro LPF f3 راه Frequency multiplier x 7₂ x(1) fe Af

Design a wideband FM transmitter to achieve an output carrier frequency of 1.7 GHz, and an output frequency deviation of Afo = 15 kHz using heterodyning, frequency multiplication, and bandpass filter operations. At the front-end of the transmitter you have a narrowband FM modulator with a carrier frequency of fe = 85 MHz, and a frequency deviation of Afi = 150 Hz. The input message waveform has a bandwidth of W = 15 kHz. For this system specifications: 1. For each stage of the design tabulate the ß, carrier frequency, frequency deviation, and Carson bandwidth of the corresponding waveform 2. Specify the center-frequencies and the bandwidths of the BPF's involved. 3. Determine the implementation of the frequency multiplication and het- erodyning operations, specifying the components involved and the block diagram for each component.