7. Sketch the signal s(t) = 10 rect (¹20°) - (a + 5) wri (²= ³). Given: a = 9, b = 3, c = 9, d = 4
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- 6) An angle-modulated signal has the form s(t) = 100 cos (2π fc t + 3 sin (2πfm t)) Where fc= 5 MHz and fm = 500 Hz. Assuming that it is an FM signal, determine and index of modulation and the bandwidth of the signal.Draw the following signal in time and frequency domains, respectively. S(t) = 5 sin (2π ft + θ) +3 sin (2π 2ft + θ) + sin (2π 3ft + θ) with f=2; θ=3π/2An AM transmitter puts a carrier of 6 A into an antenna whose resistance is 52 V. The transmitter is modulated by 60 percent. What is the total output power? ( Our lesson is AMPLITUDE MODULATION FUNDAMENTALS)
- Q7- If an angle modulated signal s(t)=10{cos(2π10^8 t)+15sin(2π10^3t)}find its maximum frequency deviation.Draw (by hand) the spectrum of the signal s(t) = 4sin(2πt) + 2sin(6πt) + 8/π sin(7πt). Also identify the absolute and effective bandwidths.a- find the instantaneous frequency for the following signals 1- S, = 8cos[1600nt2 + 47 * 1600t + 500] 2- S = 4 sin[3200 nt + 0.8 sin(500t)] b- For the circuit shown below, find the frequency domain of the o/p signal and draw the spectrum 4cos(2n 800t) Х 2cos(2n * 1800t)
- What is the amplitude of the number obtained when we put s = 2-j6 in a function given as F (s) = (s-2) (s + 3) in the complex plane?A) 0.77B) 0.83C) 0.69D) 0.91E) 0.62The carrier signal is described by the following formula: u(t)=8sin(200000πt+75°). Calculate: f, T, λ and present value of u(t) for t = 0.5TG(s)=150(6.25s+1)(s+7)/[s(46.875s+1)(s+5)(s+15)] Draw bode plot using straight line
- d) Find an expression for the frequency response H(Ω) for this system.(e) Find the system output y(t) due to the input x(t) = 5e^(-2t) u(t).Applying Parseval’’s Theorem The current in a 40 Ω resistor is i=20e-2tu(t) A. What percentage of the total energy dissipated in the resistor is associatedwith the frequency band 0≤ω≤23 rad/s?Assuming that an oscilloscope displays a Vmax of 5.22V and Vmin of 1.33V. Calculate the percentage of modulation. Three (3) AM broadcast stations are spaced at 18 kHz, beginning at 73 kHz. Each station is allowed to transmit modulating up to 6 kHz. Compute for the upper and lower sidebands of each station and plot it in the frequency domain. Given a Vmax of 7.45V and a modulation index of 0.691, calculate for Vmin. A station is given a carrier frequency of 88 kHz. Having a modulating frequency of 12 kHz, compute for the upper and lower sidebands of the station.