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In the optical communication systems that are in operation today, one uses laser diodes (LD) with λ0≈1550 nm having a spectral width of about 2 nm. [ Dm = 21.5 (ps/km-nm)] Thus, for a 1-km length of the fiber find the material dispersion τm
An electromechanical voltmeter ( range 0-100V) with zero error after calibration has a pointer bias of + 0.5V ( due to transportation). a) If the voltmeter reads 80V what is the absolute error (if such), of measurement with the voltmeter? b)What are the realtive and reduced errors ( if such)?
if C2 went short circuit explain how this would affect the output on the audio amplifier
How can I show that:
1 - the observable part of a controllable system is controllable?
2 - the controllable part of an observable system is observable?
On the attached graph paper, sketch the Bode magnitude and phase plots of the following transfer function:
Phase Modulation
a) Calculate the following parameters for a Phase Modulator which has a carrier frequency of 10 kHz and a modulating data rate of 3 kHz:
i. Carrier time period:
ii. Modulating data time period:
iii. Baud rate:
iv. Upper sideband:
v. Lower sideband:
vi. Bandwidth:
Note: show all calculations used.
b) Use Labview to build a Phase Modulator. The sinusoidal carrier signal should be adjustable up to 10 kHz and the amplitude adjustable to 5 volts, using a “simulate signal” express vi.
The modulating input should be a simulate signal vi configured as a square wave in order to provide digital modulating data. The square wave frequency should be adjustable to 5000 Hz and its amplitude adjustable to 5 volts.
The output should be displayed in the time and frequency domains using suitably configured and labelled waveform graphs. Ensure the Front Panel Layout conforms to proper HMI design guidelines.
Provide screenshots of the front panel which clearly display Phase Modulation in operation using the digital modulation data generated. Explain in your own words the displays provided.
c) Use the Labview circuit to verify the calculations in part (a). Provide screenshots with explanations to confirm the results. Explain any discrepancies.Convolve the following two sequences
Phase Modulation
a) Calculate the following parameters for a Phase Modulator which has a carrier frequency of 10 kHz and a modulating data rate of 3 kHz:
i. Carrier time period:
ii. Modulating data time period:
iii. Baud rate:
iv. Upper sideband:
v. Lower sideband:
vi. Bandwidth:
Note: show all calculations used.
Seven terminals in an on-line system are attached to a communications line to the
central computer. Exactly four of these terminals are ready to transmit a
message. Assume that each terminal is equally likely to be in the ready state (i.e.
have a message to transmit). The central computer polls the terminals in a fixed
sequence without repetition. Let X be the # of terminals polled until the first
ready terminal is located (For example if the second terminal polled is ready,
then X=2, etc…)
a) Find the PMF (Probability Mass Function) of X
b) Find the mean and the Variance of X.
A bowl contains 10 Red balls and B blue balls. 5 balls are selected at random
(without replacement). Let X be the number of blue balls selected. Find the
average value of X. Find the Variance of X. Now assume you select 5 balls with
replacement (i.e. you pick up a ball, note its color, and then put it back again). Find
E(X) and VAR (X) for this case.
A 100-kW, 250-V DC shunt generator has an armature resistance of 0.05Ω. With the generator operating at rated voltage, determine the induced voltage at full load.