17. The block diagram shown in figure 7 illustrates the phase-error-detecting
method of stabilizing the master oscillator. The circuit that changes the output
frequency as the dc error voltage changes is the
a.
1st mixer.
c.
bandpass filter.
b.
2d mixer.
d.
reactance control.
18. When an oven is used in a frequency synthesizer, the circuit component that
always appears within the oven is the
a.
tuning capacitor.
c.
multivibrator tube.
b.
oscillator crystal.
d.
amplifier transistor.
19. A modulator and filter circuit combination that selects the upper sideband
for the output is
a.
an add circuit.
c.
a multiply circuit.
b.
a divide circuit.
d.
a subtract circuit.
20. A harmonic generating and filter circuit that selects one of the harmonic
signals for the output is
a.
an add circuit.
c.
a multiply circuit.
b.
a divide circuit.
d.
a subtract circuit.
Check your answers with Lesson 1 Solution Sheet, pages 29 and 30.
327 L1
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