1. Carrier signal of message signal given with taşıyıcı m(t) = 2. cos2000nt, By transmitting as a result of Double Side Band (DSB) Amplitude Modulation with the help of c(t) = 4. cos2. 10^6nt %3D w a) Find and plot the obtained S(f) signal spectrum mathematically. b) Calculate the antenna length in case the message signal is sent directly. c) If the message signal is sent with the help of the carrier signal, calculate the antenna length and compare it with the result you found in part b. www ww ww w w wwww

1. Carrier signal of message signal given with taşıyıcı m(t) = 2. cos2000nt, By transmitting as a result of Double Side Band (DSB) Amplitude Modulation with the help of c(t) = 4. cos2. 10^6nt %3D w a) Find and plot the obtained S(f) signal spectrum mathematically. b) Calculate the antenna length in case the message signal is sent directly. c) If the message signal is sent with the help of the carrier signal, calculate the antenna length and compare it with the result you found in part b. www ww ww w w wwww

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Please answer completely what are being asked and please write neatly. Thanks! A 75 MHz carrier having an amplitude of 50 V is modulated by a 3 kHz audio signal that has an amplitude of 20 V. d. Determine the modulation factor. e. What frequencies would show up in a spectrum analysis of the modulated wave? f. Write trigonometric equations for the carrier and the modulating waves.
2. A system is being designed to use a 30 GHZ link with a 300HZ bandwidth to receive signals from a navigation spacecraft at an altitude of 20,200km, with a maximum slant range of 24,700km. The satellite transmitter-antenna gain is 25db and the handheld unit receiver gain is 5db. The transmitter power will be 18W. If the handheld receiver temperature is 500K, will this be an effective link (S/N at least 10 or 10db)? If not, what could you change to improve the link?
c) i) Consider a noisy continuous communication channel of bandwidth B = 1 MHz, which is perturbed by additive white Gaussian noise whose total spectral power is N0B = 1 W. Continuous signals are transmitted across such a channel, with average transmitted power S = 1,023 W. Give a numerical estimate for the channel capacity, in bits per second, of this noisy channel. ii) Suppose that for such a continuous channel with added white Gaussian noise, the ratio of signal power to noise power is given as 30 decibels, and the frequency bandwidth B of this channel is now 10 MHz. Determine the information capacity of this noisy channel, in bits per second, and the number of signal levels needed to achieve it. ONLY answer question ii)
Solve for Icsat when B = 40, Vce,sat = 0.2V and Vcc = 12V. Do not suppose that Ib is negligible.
1. A 1500-kHz carrier and kHz intelligence signal are combined in a nonlin-ear device. List all the frequency components produced. *2. If a 1500-kHz radio wave is modulated by a 2-kHz sine-wave tone, what frequencies are contained in the modulated wave (the actual AM signal)? *3. If a carrier is amplitude-modulated, what causes the sideband frequencies? *4. What determines the bandwidth of emission for an AM transmission? *10. What are some of the possible results of overmodulation? *11. An unmodulated carrier is 300 V p-p. Calculate %m when its maximum p-p value reaches 400, 500, and 600 V. (33.3%, 66.7%, 100%) 12. If V and V as shown in Figure 8, determine %m. (53.85%) 13. Determine and from Problem 12. ( Vpk, Vpk)
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a) If the carrier signal is 10V 100kHZ, the information signal is 5V 3kHZ, an AM Modulator is passed through a filter with Fr=100kHZ and Q=10, what is the sending status of the carrier lower and upper sidebands? b) Draw the AM modulator output envelope? c) Calculate the Modulation index and the sideband and total power to be sent in the transmitter according to the 50 Ohm transmitter output impedance? d) Draw the frequency spectrum? Calculate the antenna length in the transmitter?
A 162-MHz carrier is deviated by 12 kHz by a 2-kHz modulating signal. What is the modulation index?
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A mobile phone antenna with a gain of 2 dB transmits a 0.5 W signal to a base station with an antenna gain of 8 dB. Assume the minimum sensitivity of the receiving antenna to be Pr = -110 dBm. If the operating frequency is 700 MHz, what is the maximum allowed distance between the base station and the mobile phone?.
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