Question

- An angle modulated signal with carrier frequency
ω
_{c}=2π×10^{5}is described in this equation β(t) = 10cos(ω_{c}t + 5sin3000t + 10sin2000t).

- Find the frequency deviation
- Find the deviation ratio
- Bandwidth.

Answer #1

An audio frequency signal 10 sin(2π×500t) is used to
amplitude modulate a carrier of 50 sin(2π×105
t).
Calculate:
a) Frequency of side bands
b) Bandwidth
c) Modulation index
d) Amplitude of each side band.
e) Total power delivered to a load of 600Ω.

A carrier signal, Vc(t) = 5cos(1π3000t) F is frequency
modulated by a modulating
signal of 4 kHz with a modulation
index of 2. The FM wave is transmitted through a 50 Ω antenna. With
the aid of Bessel Function Table, determine the:
number of sets of significant sidebands,
frequency deviation,
carrier swing,
minimum and maximum frequency of the FM signal,
bandwidth using Bessel Function Table,
frequencies of all the significant sidebands,
total power of the FM signal.
Hence, sketch and...

1. An amplitude modulated system has following parameters:
Modulating signal frequency fm = 500 Hz, Carrier frequency fc =
2KHz. Draw a two-sided spectrum with approximately scaled
frequencies and amplitude. Consider perfect modulation (mod index =
1).
2. What is the typical range of AM modulation index (depth)?
What will happen if it is at the lowest value or highest value in
the range? What will happen if it goes beyond the range? too low a
level of modulation and...

The message m(t) = 5 cos(2?1000t) is frequency-modulated to
90MHz, with kf=2000?.
Determine the frequency deviation and deviation ratio of the FM
signal. Also estimate the bandwidth of the FM signal.
Suppose now you are provided with a crystal oscillatorat 90MHz,
an analog multiplier, and a second-order loop filter, and a VCO.
Explain by drawing a block diagram how the FM signal can be
demodulated using these components. Specify the minimum required
operation range of the VCO.

Consider the signal x(t) = 3 cos 2π(30)t + 4 .
(a) Plot the spectrum of the signal x(t). Show the spectrum as a
function of f in Hz. ?π? For the remainder of this problem, assume
that the signal x(t) is sampled to produce the discrete-time signal
x[n] at a rate of fs = 50 Hz.
b Sketch the spectrum for the sampled signal x[n]. The spectrum
should be a function of the normalized frequency variable ωˆ over
the...

A wave on a string is described by the equation y(x,t)=3.0
cm*〖cos(〗〖2π*(x/2.4m+t/(0.2 s)))〗 . X is in meters and t is in
seconds.
Is the wave travelling to the right or to the left?
_________
What is the wave speed? _________
What is the wave frequency? __________
What is the wavelength? ___________
At t=0.50 seconds what is the displacement of the string at
x=0.20 meters. _________

A signal described by y(t) = .25*sin(6000*t) + cos(3500*t) was
sampled with fs = 1 kHz. Determined:
a) Whether this signal was aliased. Provide the spectral plot
(magnitude versus frequency)
b) If the signal proved to be aliased, find the right sampling
rate
c) Provide the spectral plot indicating the right frequencies of
the signal

One of your commonly-used laboratory instantaneous test signal
voltages (vs) is described by the equation...
π vs=6sin2πft 4 −
where f = 1MHz and t represents time.
Make time (t) the subject of this formula, and hence determine
the first point in time when the instantaneous signal voltage has a
magnitude of +3V.
Note: A colleague has reminded you that you need to have your
calculator in radians mode (RAD) for this calculation, because the
angle is given in radians...

The motion of an underdamped oscillator is described by equation
x=Ae−(b/2m)tcos(ω′t+ϕ).
Let the phase angle ϕ be zero.
Part A
According to this equation, what is the value of x at
t=0?
Express your answer in terms of the variables A,
b, m, ω, and ϕ.
x(0) =
A
SubmitMy AnswersGive
Up
Correct
Part B
What is the magnitude of the velocity at t=0?
Express your answer in terms of the variables A,
b, m, ω, and ϕ.
vx(0) =...

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