Assignment Questions

Neets Module 12-Modulation Principles
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11 2-9. Fsk has which of the following advantages over cw? 1. Fsk has a more stable oscillator 2. Fsk is easier to generate 3. Fsk rejects unwanted weak signals 4. Fsk does not have noise in its output 2-10. The "ratio of transmitted powers" provides what information? 1. Transmitter power out in a cw system 2. Transmitter power out in an fsk system 3. Improvement shown using cw instead of fsk transmission 4. Improvement shown using fsk instead of cw transmission methods 2-11. In an fm signal, (a) the RATE of shift is proportional to what characteristic of the modulating signal, and (b) the AMOUNT of shift is proportional to what characteristic? 1. (a) Amplitude (b) amplitude 2. (a) Amplitude (b) frequency 3. (a) Frequency (b) frequency 4. (a) Frequency (b) amplitude THIS SPACE LEFT BLANK INTENTIONALLY. Figure 2A.—Oscillator circuit. IN ANSWERING QUESTIONS 2-12 THROUGH 2-14, REFER TO FIGURE 2A. 2-12. When a sound wave strikes the condenser microphone (M), it has which, if any, of the following effects on the oscillator circuit? 1. It changes output phase 2. It changes output voltage 3. It changes output frequency 4. It has no effect 2-13. What is the purpose of capacitor C in the circuit? 1. It helps set the carrier frequency of the oscillator 2. It prevents amplitude variations in the oscillator output 3. It sets the maximum frequency deviation of the oscillator 4. It varies the output frequency in accordance with the modulating voltage

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