LESSON SOLUTIONS
SIGNAL SUBCOURSE 324......................FM Radio Receivers
LESSON 1..................................RF Amplifiers
All references are to TM 11-668, unless otherwise indicated.
1. d--para 55
2. b--para 58b(2), fig. 109
3. c--para 58b(2), fig. 109
Bandwidth = 102.08 MHz - 101.92 MHz
= 160 kHz
Figure 109 shows that the noise voltage for a bandwidth of 160 kHz and an
input resistance of 7,000 ohms will be approximately 4 microvolts.
4. c--para 58c
5. b--para 58d, fig. 109
According to the table in paragraph 58d, hexodes have an equivalent noise
resistance of about 200,000 ohms.
In figure 109, the intersection of the lines
representing 200,000 ohms and 100 kHz indicates a noise voltage of approximately 20
microvolts.
6. a--para 59b, c
7. a--para 60a
Screen current given as 3 ma
Plate current at -1 grid volt is 10 ma (from fig. 1-4)
55
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