8. b--para 61d
Adding a -4-volt AVC potential to the -2-volt control-grid bias will set
the control grid at -6 volts.
Figure 1-4 shows that the plate current will
increase approximately 1/3 ma when a 1-volt positive signal reduces the grid
voltage to -5 volts.
9. c--para 60b(5)
10. a--para 60d, 61a, c(1)
11. d--para 60a, 61b(4)
12. d--para 60d-f
13. b--para 61c
14. c--para 61d(2)
15. a--para 70d(2)
16. a--Attached Memorandum, para 1-1
17. b--Attached Memorandum, para 1-la, c
18. d--Attached Memorandum, para 1-2
19. c--Attached Memorandum, para 1-2d
20. a--Attached Memorandum, para 1-1c, 1-3
LESSON 2..................................Mixers, Converters, and Local Oscillators
All references are to TM 11-668, unless otherwise indicated.
1. c--para 62a
Normally, the first local oscillator in a communication receiver in this
frequency range will operate at a lower frequency than the incoming signal.
The
second oscillator will operate at a higher frequency than the first IF.
1st Osc frequency = Incoming frequency - IF
+ 35.0 - 4.3 = 30.7 MHz
2d Osc frequency = 1st IF + 2d IF
= 4.300 + 0.455 = 4.755 MHz
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