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Question 2.Question :(TCO 3) An AM receiver s local oscillator is tuned to 1195KHz and is using high-side injection. What would be the frequency of the desired carrier?Student Answer:170KHz285KHz740KHzExplanation:For high side injection fLO= fC+ 455 KHz, fC= fLO- 455 = 1195 -455 = 740 KHz1650KHzInstructor Points Received:0 of 5Comments:Question 3.
Question :(TCO 3) An AM receiver is tuned to receive a carrier frequency of 1040KHz and is using high-side injection. What would be the frequency of the image frequency?
Student Answer:1950KHzInstructor fIM = fC+ 2(455) = 1040 + 2(455) = 1950 KHzPoints Received:5 of 5Comments:Question 4.Question :(TCO 3) An AM receiver is tuned to receive a carrier frequency of 1370KHz and is using low-side injection. What would be the image frequency?Student Answer:2280KHzInstructor fIM = fC- 2(455) = 1370 - 2(455) = 460 KHzPoints Received:5 of 5Comments:Question 5.Question :Referring to the spectrum analyzer display below for the AM signal, what is the modulation frequency? Student Answer:20KHz
Instructor Points Received:10 of 10Comments:Question 6.Question :Based on information from previous question, modulator factor = ______Student Answer:0.10.20.40.5None of the above.Explanation:0.4Instructor Points Received:0 of 10Comments:Question 7.Question :Continue from previous question, carrier frequency = ______Student Answer:20KHz ()40KHz ())
80KHz ()100KHz ()Instructor Points Received:10 of 10Comments:Question 8.Question :In AM Superheterodyne receiver, IF Amps are lowpass filters and cutoff frequency is set at 455KHz.Student Answer:TrueFalseInstructor Explanation:bandpassPoints Received:0 of 10Comments:* Times are displayed in (GMT-07:00) Mountain Time (US & Canada)Grading SummaryThese are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below.Date Taken:5/28/2016Time Spent:17 min , 03 secsPoints Received:20 / 50 (40%)Question Type:# Of Questions:# Correct:True/False20Multiple Choice43Grade Details - All QuestionsQuestion 1.Question :(TCO 4) From the spectrum analyzer display shown below, determine the total bandwidth needed to transmit that signal. Student Answer:15KHz
60KHz90KHz120KHzInstructor Explanation:From the given scale, each division is 160/4 = 40 KHz. The signal occupies a littlemore than two divisions and therefore the required BW is about 90 KHz.Points Received:0 of 10Comments:Question 2.Question :(TCO 4) From the spectrum analyzer display below, determine the modulation frequency.Student Answer:5KHz15KHz30KHz90KHz200KHzInstructor Explanation:Modulation frequency is the difference between any two consecutive frequencies.