UNIVERSITI MALAYSIA PERLIS Pusat Pengajian Kejuruteraan Komputer dan Perhubungan Semester 1, 2011/12 DKT 211 Basic Communication Engineering

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1 UNIVERSITI MALAYSIA PERLIS Pusat Pengajian Kejuruteraan Komputer dan Perhubungan Semester 1, 2011/12 DKT 211 Basic Communication Engineering TUTORIAL 1: NOISE AND TRANSMISSION MEDIA & EM TUTORIAL 1 CHAPTER 1 PART 1: An introduction to Communication PART A: MULTIPLE CHOICE 1. Communication is the process of a. keeping in touch b. broadcasting c. exchanging information d. entertainment by electronics 2. Which of the following is not a major communications medium? a. Free space b. Water c. Wires d. Fiber optics cable 3. Any physical phenomenon which conveys information is called. a. microwaves b. noise c. signal d. filter 4. Random interference to transmitted signals is called a. Adjacent channel overlap b. Cross talk c. Garbage-in, garbage-out d. Noise 5. Which of the following is not a source of noise? a. Another communication signal b. Atmospheric effects c. Manufactured electrical systems d. Thermal agitation in electronics components 6. One way communication is called a. Half duplex b. Full duplex c. Monocomm d. Simplex

2 7. Simultaneous 2-way communications is called. a. half duplex b. full duplex c. Bicomm d. Simplex 8. The original electrical information signal to be transmitted is called the. a. modulating signal b. carrier c. baseband signal d. source signal 9. The process of modifying a high frequency carrier with the information to be transmitted is called. a. multiplexing b. telemetry c. detection d. modulation 10. A frequency of 27MHz has a wavelength of approximately. a. 11m b. 27m c. 30m d. 81m 11. The voice frequency range is. a Hz b Hz c kHz d. 0Hz-15kHz 12. A signal occupies the spectrum space from GHz. The bandwidth is a MHz b. 7MHz c. 237MHz d. 700MHz

3 PART B 1. What is the db gain (or loss) for the following situation? (a) For a certain system, the output power is 1,000,000 times the input power. (b) When the power out of the system is times the power in? 2. An amplifier has an output of 20 W. What is its output in dbm? 3. The input to a network is W. What is the input in dbm? 4. A certain system has three stages with power gains of 15, 65, and 52. Determine the power gain in db of each stage and the overall system gain, both in db and watts. 5. Use dbm to indicate the value of a 1pW signal. 6. For the system shown in figure below, the input voltage is +20dBμV.What is the output voltage? Vin= +20dBμV Vout=? +80dB voltage gain 7. If a -35dBm signal undergoes amplification of +42dB, determine its resulting level in both dbm and watts.

4 UNIVERSITI MALAYSIA PERLIS Pusat Pengajian Kejuruteraan Komputer dan Perhubungan Semester 1, 2011/12 DKT 211 Basic Communication Engineering TUTORIAL 1 CHAPTER 1 PART 2: Noise and Transmission Media and EM Propagation Part A Noise 1. Define the following: i) Noise ii) Interference iii) Distortion 2. Briefly explain what thermal noise is. 3. A domestic television receives antenna delivers a sky noise power of -105 dbm to a matched coaxial feeder in a radio frequency bandwidth of 8 MHz. Find the antenna noise temperature. 4. An amplifier has noise equivalent bandwidth of 15 khz. When a 10 kω resistor at 300 K is connected to the input, determine the thermal noise voltage of the amplifier by assuming the meter is impedance matched to the amplifier. 5. An amplifier is quoted as having a noise figure 3.5 db. Calculate the noise factor, noise temperature and noise power. Use 290 K as the reference temperature. 6. An antenna is connected to some receiving system using a waveguide with a loss of 0.3 db. Calculate the overall effective temperature of the system if antenna temperature, T a is 15 K. Assume ambient temperature is 300 K. Antenna T a = 15 K Waveguide loss = 0.3 db G 2 = 20dB T e2 = 6 K G 3 = 15dB F 3 = 4 db

5 7. Calculate the equivalent noise temperature of a microwave amplifier with an average noise power of 1x10-14 W and operating bandwidth of 25 MHz. 8. An amplifier consists of three identical stages in tandem. Each stage having equal input and output impedances. For each stage, the power gain is 5 db when correctly matched. Calculate the overall power gain. Part B Transmission Media and EM Propagation 9. States four types of channels. 10. Define the following terms: a. Terrestrial propagation b. Multipath reception 11. A taxi company uses a central dispatcher with an antenna at the top of a 10 m tower to communicate with the taxicabs. The taxi antennas are on the roofs of the cars which is 1.3 m above the ground. Calculate the maximum communication distance between the dispatcher and a taxi. Hint: d = [ (17 h T ) ½ + (17 h R ) ½ ] Where d = distance in km h T = Transmitter s height in meter h R = Receiver s height in meter 12. List down three mode of propagations for electromagnetic waves.

6 UNIVERSITI MALAYSIA PERLIS Pusat Pengajian Kejuruteraan Komputer dan Perhubungan Semester 1, 2011/12 DKT 211 Basic Communication Engineering TUTORIAL 1 CHAPTER 1 PART 3: Introduction to Basic Filter 1. What is the bandwidth of a filter with a Q of 75 and center frequency of 375 MHz? 2. If the 6dB bandwidth of a filter is 3.1 khz, determine the 60-dB bandwidth if the filter shape factor is Calculate the cutoff frequency for the LPF and HPF circuit shown below: (a) Low-pass filter: R = 4.7 kω, C = 10 nf (b) High-pass filter: R = 10 kω, C = 7 µf

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