4. Assume that the step frequency selectors of the synthesizer module of
Radio Set AN/PRC-74 are set as follows: S1 at 2, S2 at 3, S3 at 4, and S4 at 5.
The output frequency from the synthesizer is
a.
8,932 kHz.
c.
3,682 kHz.
b.
7,182 kHz.
d.
1,750 kHz.
5. How many crystals are used by the synthesizer module of Radio Set AN/PRC-74 to
provide frequencies in the range of 3.750 to 13.749 MHz in increments of 1 kHz?
a.
10
c.
40
b.
20
d.
100
6. In all frequency calculations involving the frequency synthesizer of the
AN/PRC-74, there is a factor of 1,750 kHz to consider. This frequency is the
a.
difference between
the
synthesizer
output
frequency
and
crystal Y41.
b.
sum of the synthesizer output frequency and the IF of the IF-audio module.
c.
difference
between
the
synthesizer
output
frequency
and
the
operating
frequency.
d.
sum of the synthesizer output frequency and the operating frequency.
Exercises 7 through 10 are based on the block diagram of the synthesizer of
Radio Set AN/PRC-74 (fig. 2-1).
7. In the block diagram of the frequency synthesizer of Radio Set AN/PRC-74,
one assembly contains neither crystals nor mixers. That assembly is
a.
A3.
c.
A6.
b.
A4.
d.
A7.
8. During system operation, slight variations from the assigned receive
frequency may be compensated for by the receiving operator by adjusting Capacitor
a.
C601
c.
C612.
b.
C602.
d.
C617.
9. The third mixer has two input signals, one from the MHz oscillator (Q9)
and the second from the 100-kHz bandpass .amplifier.
The signal selected by the
output amplifier and low-pass filter is the
327 L2
24
Previous Page
