24 Figure 3F.—Foster-Seeley discriminator. IN ANSWERING QUESTIONS 3-25 THROUGH 3-30, REFER TO FIGURE 3F. 3-25. In the figure, what is the purpose of Q1? 1. To act as a limiter only 2. To act as an amplifier only 3. To act as a limiter and an amplifier4. To act as an oscillator3-26. To what frequency are C1/L1 and C2/L2 tuned? 1. The af input 2. The center frequency of fm signal 3. The lowest fm deviation frequency 4. The highest fm deviation frequency3-27. What is the function of L3? 1. To couple af to the output 2. To couple rf from the tank circuits to CR1 and CR2 3. To prevent af from being coupled to the power supply 4. To provide the dc return path for CR1 and CR2 3-28. At resonance, what is the amplitude of e3compared to e4? 1. e3 is less than e42. e3 is equal to e43. e3 is greater than e4
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