7) If f1= 5MHz and f2=7 MHz, find: a. 2nd order harmonics. b. 3rd order harmonics....
7) If f1= 5MHz and f2=7 MHz, find: a. 2nd order harmonics. b. 3rd order harmonics. c. 3rd order inter-modulation products (IMD)
8) In a superheterodyne receiver, the input RF frequency is 1 GHz. Find the IF frequency if the local oscillator frequency is 950 MHz?
9) Rank from 1 to 3 for linearity and efficiency with 1 as the most linear and most efficient.
| Class of amplifier | Linearity | Efficiency |
|---|---|---|
| Class A | ||
| Class B | ||
| Class C |
10) Which of the following signal/s has/have a constant envelope? a. FM signal b. AM signal c. PM signal
6) Find the required transmit power in dB for a communications system with received power 10 mW, receive antenna gain 3 dB, transmit antenna gain 3 dB, distance between receiver and transmitter 1 Km, and f=1 GHz. Consider light speed as 300,000 Km/Sec.
11) In problem 6, what transmits power we need to have if we double the frequency.
12) Which of the following modulated signals are more sensitive to the noise? Why? a. FM signal b. AM signal c. PM signal
Homework Answers
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7) If f1= 5MHz and f2=7 MHz, find: a. 2nd order harmonics. b.
3rd order harmonics....
Consider the satellite relay link with the following parameters. Downlink EIRP of the satellite: 55 dBW...
Consider the satellite relay link with the following parameters. Downlink EIRP of the satellite: 55 dBW Transmit frequency: Receiver noise temperature:700 K Receiver antenna gain Transmitter- receiver distance: 41,000 km System bandwidth: Total system losses (margin): 3 dB 2 GHz 0 dB 50 kHz (a) Find the received signal power in dBW (b) Find the receiver noise level in dBW (c) Calculate the signal-to-noise ratio at the receiver in dB
Solve the multi-task problem: The LEO cellular satellite communication system requires the forward link (from satellite...
Solve the multi-task problem: The LEO cellular satellite communication system requires the forward link (from satellite to the earth mobile) signal-to-noise ratio (SNR) in the output of the earth station receiver to be 17dB. The link has the following specifications: Operation frequency f = 6 GHz Receiver antenna gain (earth station), Gr = 0 dB Transmitter antenna gain (satellite), Gt = 3 dB Distance to satellite, d = 1000 km Bandwidth of the receiver, B = 2 MHz Noise...
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the rece...
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the receiver if the range of the local oscillator is 10 MHz to 35MHz 75. An AM transmitter uses high-level modulation. The RF power amplifier draws 12 A from 22 V supply putting out a carrier power of 140 Watts. What impedance would be seen at the modulation transformer secondary? 72. A receiver has a sensitivity of 0Suv and blocking...
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specificati...
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specifications: input power Prad 3.25 kw; effective area of antenna Aeff 3.5 m2; total efficiency of antenna,-42%; radiation efficiency of antenna ecd-65%; tilt angle of the received signal ψ = 35°. Determine Voltage standing voltage ratio; b. i. Gain of the antenna (in dB) ii. Maximum radiation...
Find the wavelength for (a) a typical AM radio wave with a frequency of 1000 kHz and (b) a typical FM radio wave of 100 MHz.
Find the wavelength for (a) a typical AM radio wave with a frequency of 1000 kHz and (b) a typical FM radio wave of 100 MHz. 3. What is the frequency of a 3-cm microwave? 4. What is the frequency of an X ray with a wavelength of 0.1 nm? 5. What is the maximum strength of the B -field in an electromagnetic wave that has a maximum E -field strength of 1000 V/m? 6. Calculate the wavelengths of a 1530-kHz AM radio signal,...
DATA COMMUNICATIONS AND NETWORKING
In this question we will determine the maximum achievable transmission rate in the downlink of a wireless communication network. Here are the specifications of interest:- Base station (BS) transmit power. \(P_{t x}=200 \mathrm{~mW}\)- Transmitter (BS) anterma gain: \(G_{C X}=7 d B\)- Receiver (terminal) antenna gain: \(G_{\mathrm{rx}}=3 \mathrm{~dB}\)- Quality requirement: \(\mathrm{SNR}>5 \mathrm{~dB}\)- Carrier frequency: \(f=2 \mathrm{GHz}\)- Receiver noise figure: \(F=3.98=6 \mathrm{~dB}\)- Ambient temperature: \(T=290^{\circ} \mathrm{K}\)- Boltzmann constant: \(k=1.38 \times 10^{-23}\) joule \({ }^{\circ} K\)- Path loss: \(P L=\left(\frac{4 \pi}{\lambda}\right)^{2} d^{4}\)- Maximum...
1. Suppose log10(x) = 25. Calculate log2 (x) by calculating x and then calculating log2 (x)....
1. Suppose log10(x) = 25. Calculate log2 (x) by calculating x and then calculating log2 (x). Be sure to show the instructions you gave to R, as well as the value of x and the final result. 2. Find log2 (x), as in (1) without calculating x, by multiplying by something. 3. Suppose log2 (x) = 25. Calculate log10(x) for y = 25 by calculating x and then calculating log10(x). Be sure to show the instructions you gave to R,...
27. The time required for a voltage pulse to travel the length of a 50 0hm cosxial cable is a function of the a) length of the cable. b) distributed inductance and capacitance of the cable. c) i...
27. The time required for a voltage pulse to travel the length of a 50 0hm cosxial cable is a function of the a) length of the cable. b) distributed inductance and capacitance of the cable. c) impedance used to terminate the cable. 28. The technical (as opposed to technical and economical) specifications for the low pass filter of the final design project could be satisfied with a a) third order Butterworth filter. b) fifth order Chebyshev filter. c) forth...
Consider the satellite relay link with the following parameters. Downlink EIRP of the satellite: 55 dBW Transmit frequency: Receiver noise temperature:700 K Receiver antenna gain Transmitter- receiver distance: 41,000 km System bandwidth: Total system losses (margin): 3 dB 2 GHz 0 dB 50 kHz (a) Find the received signal power in dBW (b) Find the receiver noise level in dBW (c) Calculate the signal-to-noise ratio at the receiver in dB
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the receiver if the range of the local oscillator is 10 MHz to 35MHz 75. An AM transmitter uses high-level modulation. The RF power amplifier draws 12 A from 22 V supply putting out a carrier power of 140 Watts. What impedance would be seen at the modulation transformer secondary? 72. A receiver has a sensitivity of 0Suv and blocking...
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specifications: input power Prad 3.25 kw; effective area of antenna Aeff 3.5 m2; total efficiency of antenna,-42%; radiation efficiency of antenna ecd-65%; tilt angle of the received signal ψ = 35°. Determine Voltage standing voltage ratio; b. i. Gain of the antenna (in dB) ii. Maximum radiation...
27. The time required for a voltage pulse to travel the length of a 50 0hm cosxial cable is a function of the a) length of the cable. b) distributed inductance and capacitance of the cable. c) impedance used to terminate the cable. 28. The technical (as opposed to technical and economical) specifications for the low pass filter of the final design project could be satisfied with a a) third order Butterworth filter. b) fifth order Chebyshev filter. c) forth...
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