COMNET Assignment (2)

Q1. An FM transmitter has the block diagram shown in Figure Q1. The audio frequency response is constant over the 20 Hz to 20 kHz audio band. The FM output signal is to have a carrier frequency of 90.7 MHz and a peak deviation of 75 kHz. (a) Find the bandwidth and centre frequency required for the bandpass filter. FM exciter fc = 5.00 MHz Oscillator fo= ? Bandpass filter Figure Q1. x8 Frequency multiplier Class C amplifier FM output

In the square wave signal in the figure, the duration of 1 is 0.6ms and the period is 1ms; a) What is the average DC value of the signal? b) Interpret the given signal equation? c) 1.2. and amplitude values ​​of the 3rd harmonic signals. Calculate, draw the frequency spectrum. d) Draw the frequency domain.

(d) With the aid of well-labeled waveform diagrams, explain Amplitude Modulation Frequency Modulation Phase Modulation (e) A FM modulator produces a frequency deviation of 45 KHzwhen a modulating signal with frequency of 15 KHz and a carrier signal with amplitude 20Vand frequency of 300 KHz is mixed in the modulator. Determine: The minimum bandwidth from Bessel function table. The approximate minimum bandwidth using Carson's rule. (f) An FM wave is represented by the voltage equation: e = 12 sin (6 x 10°t + 5 sin 1250t). (1) Determine the carrier (ii) The modulating frequencies (ii) The maximum deviation of this FM wave (iv) What powerwill this FM wave dissipate in a 1022

Explain the differences between Angle and Amplitude modulation. Both techniques positive and negative Talk about its features.

How the phase modulation can generate frequency modulation?

2. Write an OCTAVE program to plot the signal given below. P- Pmax Sin(21Ift); where Pmax= 10 MW, -60 Hz. %3D Find out time period and verify it with graph. Assume necessary data.

The RF signal generator is used to produce an AM signal using an AF signalgenerator as the source of modulating signal. The RF generator is thenconnected to the oscilloscope. The oscilloscope displays an overmodulatedAM signal. What adjustment would you do to produce an undistorted AMsignal?

An Oscilloscope is set; such that Attenuator Key (Voltage Key) is at (4V/div) position and the Time Base Key is at (10 ms/div). If a signal of maximum voltage Vmax = 8V, and frequency f = 50 Hz. Draw the signal displayed on the oscilloscope.

Using MATLAB. Generate a square wave signal whose peak amplitude is 1 V, frequency of 1000 Hz, and 50% duty cycle. Use a sampling rate of 20000 Hz and a duration of 1 s. Plot the signal for a duration of 5 ms. Please help by giving the code. Thank you

Please write introduction four - line . for lab report about: (Fundamentals of AC and Signal generation using Oscilloscope)

Explain the derivation of amplitude modulation?

Answer the following questions about oscillating electrical signals (alternating current or voltage).    a. What equation describes the signal as a function of time?   b. What is the definition of the frequency and what are the units?   c. What is meant by a high pass filter and a low pass filter when dealing with oscillating electrical signals?   d. How can a simple RC circuit serve as a high pass or low pass filter.

Draw a block diagram of a PM demodulator using frequency discriminator method.

Figure (1) shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit audio signals containing frequencies in the range of 100 Hz to 15 kHz. The narrowband is supplied with a carrier of frequency fl-0.1 MHz by crystal- controlled oscillator also ß-0.2, a second crystal- controlled oscillator supplied a sinusoidal wave of frequency 9.5 MHz to the mixer. The system Carrier frequency at the transmitter output, fc-100MHz Minimum frequency deviation, Af-75, find nl and n2? f(t) NBFM Freq. Multiplier 1 Oscillator1 Fig. (1) Mixer Oscillator2 Freq. Multiplier 2 frm(t) n1=72, n2=47 O n1=73, n2-48 O n1=75, n2=50 n1=77, n2=52 O n1=76, n2=51 O

Explain the differences between Angle and amplitude modulation. Talk about the positive and negative properties of both techniques.

Facts A clipper is an electronic circuit that produces an output by removing a part of the input above or below a reference value. That means the output of a clipper will be the same as that of the input other than the clipped part. Due to this, the peak to peak amplitude of the output of a clipper will be always less than that of the input. The main advantage of clippers is that they eliminate the unwanted noise present in the amplitude of an ac signal. Question: What do you think is the main disadvantage of a Clipper circuit over a Clamper Circuit?

Also give the excitation table and transition table and state diagram too

Draw the circuit of inductor filter and explain its operation.

The carrier frequency is 600 Hz, and the modulating signal is a single-tone sinusoidal signal. The x-axis is in time while the y- axis is the amplitude of the AM signal. If the peak voltage level of modulating and 1v and signal respectively, determine the modulating index. the carrier are 2V 2 1.5 1 0.5 -0.5 -1 -1.5 -2 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 Time (s)

1. Attenuator of -10dB has gain () 2. An output signal has a fundamental amplitude of 2.5V, second harmonic amplitude of 0.25V, and third harmonic amplitude of 0.1V. then the total harmonic distortion is found to be 3. The current capability of power diodes can be increased by placing two or more in 4. As the illumination on a photoconductive cell (photoresistive device) increases in intensity, the terminal resistance will 5. The LCD has the advantage of having than LED. 6. The triac is fundamentally a diac with a for controlling the turn-on condition. prevo t hat lt

Consider FM wave with a sinusoidal wave of frequency fm as the modulating signal, and assume a peak frequency deviation Af. Determine the average power of the modulating signal (assume antenna resistance 1 ohm)

Make an essay about "how filter circuits for AC and DC power supply works"

P3/ You want to generate an FM signal with a carrier frequency of 179.2 kHz and a deviation of maximum frequency of 1600 Hz. Initially it is counted with an narrow band FM system (NBFM) with a carrier frequency of 2800 Hz. (a) Design a frequency multiplier that allows generating the desired FM signal from La SEFAL NBFM (i.e, indicate su factor multiplicición) h enecifiaue the maximum frequency deviation value that must be configured in the NBFM system to meet the desired FM signal specification

An FM signal which is modulated by a 4 kHz sine wave reaches a maximum frequency of 100.01 MHz and minimum frequency of 99.97 MHz, then what is the one side frequency deviation of the signal?

6) In digital frequency meter, Schmitt trigger converts input signal into a ............ wave, which has a fast rise and fall time.

+Vsup R1 -Vo R2 VIN -Vsup R1 R2 In the above circuit, R1 = 1 kN, R2 = 6 kM, and Vaup = 15 V Estimate the hysteresis band (in Volt) The time period of a periodic signal is about a few seconds. To measure the frequency of this signal with a digital frequency meter which mode is more suitable? Select one: a. Reciprocal counting mode b. Direct counting mode a

Q/ Discuss how you can convert the square wave into the sinewave of fundamental frequency.

)A message signal C. 1 m(t) = — sinc² (²—1.-) 4 4 will be sampled. a. Determine the minimum required sampling frequency b. Determine and plot the frequency spectrum for the ideal sampling when the sampling frequency is fs = 1Hz Determine and plot the frequency spectrum for the ideal sampling when the sampling frequency is fs = 4Hz d. Determine and plot the frequency spectrum for the flat-top sampling when the sampling period is T, = 0.5 s and the pulse width is T = 0.25s

Good day! Please help me understand how series modulator work in obtaining AM wave. Explain the flow of the circuit as well as the functions of the components. Need ASAP. Thank you so much!

How to calculate the efficiency in frequency modulation and what is the highest value for efficiency in frequency modulation