15. Assume that the amplifier shown in B of figure 4-1 is one of the IF
amplifiers in your FM receiver. What effect will an increase in the carrier signal
level have on the forward bias and the gain of the amplifier?
a. Both decrease.
b. Both increase.
c. Bias increases and gain decreases.
d. Bias decreases and gain increases.
16. The squelch voltage in a receiver is derived from the noise signal, carrier
signal, or a tone signal. The tone- and carrier-derived squelch voltages are also
called
a. new.
c.
new and old, respectively.
b. old.
d.
old and new, respectively.
SITUATION
Assume that you have been assigned the task of teaching the theory and operation
of Radio Receiving Set AN/PRR-9 to a newly formed maintenance team.
The
maintenance personnel must be aware of the different frequencies appearing
throughout the receiver and also the functions performed by each component within
the receiver.
Exercises 17 thru 20 are based on this situation.
17. The selectivity of the receiver shown in figure 4-4 is determined primarily
by the components making up the
a. two mixing stages.
b. two 455-kHz amplifiers.
c. two local oscillator stages.
d. three tunable tank circuits.
18. Tunable coil L1, located in the
antenna
circuit
of
the
transistorized
receiver shown in figure 4-4 is used to
a. tune out antenna capacitance.
b. tune out antenna resistance.
c. compensate for antenna conductance.
d. compensate for the neutralizing signal in the first RF amplifier.
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