17. Assume that when a 3-kHz signal is applied to the circuit shown in A, figure
32 of TM 11-668, the signal between the grid and cathode is 4 volts.
frequency of the input signal is increased to 15 kHz, the signal voltage between
the grid and cathode should be
a. 4 volts.
b. 8 volts.
18. The time constant of a preemphasis network is chosen to provide selective
The time constant of the preemphasis
network shown in figure 1-2 is approximately
a. 45 microseconds.
b. 75 microseconds.
19. The characteristic of FM that makes it more useful in military applications
than AM is its
b. efficiency at high frequencies.
c. high-fidelity reception.
d. wide acceptance band.
20. Assume that the amplitude of a desired signal at the input of an FM receiver
is 2 microvolts, and that other signals are present with frequencies lying within
the receiver acceptance band. If the receiver output is to be free of interference
noise, the amplitude of the undesired signals must have a maximum limit of
a. 0.002 microvolt.
b. 0.02 microvolt.
c. 1 microvolt.
d. 4 microvolts.
CHECK YOUR ANSWERS WITH LESSON 1 SOLUTION SHEET PAGE 47, 48 and 49.