LESSON SOLUTIONS
SIGNAL SUBCOURSE 323......................FM Radio Transmitters
LESSON 1..................................Principles of FM
All references are to TM 11-668, unless otherwise indicated.
1. a--para 2, 3
The peak amplitude is the
maximum
voltage
in
either
the
positive
or
negative direction. Hence, 5 volts.
Figure 1-1 shows 8 cycles in 0.0001 second.
Therefore, the number of
cycles occurring in one second is 8 x 10,000 = 80,000. The frequency is 80,000 Hz,
or 80 kHz
2. a--para 3a
3. b--para 3b(l)
For 100-percent modulation, the modulating voltage must equal the carrier
voltage. Therefore, the minimum carrier voltage is 30 volts.
4. b--para 3c(2)
Hence, the carrier varies between the values of 99,372 Hz and 100,628 Hz.
6. a--para 5
7. c--para 7
8. d--para 10c
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