a. plate and grid of V1.
c. grid of V1 and grid of V2.
b. plate and grid of V2.
d. plate of V1 and plate of V2.
4. The function of inductor L3 in this circuit is to
a. provide regenerative feedback.
b. provide degenerative feedback.
c. prevent AF from entering the oscillator.
d. prevent RF from entering the power supply.
5. Grid bias voltage for modulator tubes V4 and V5 is developed as a result of
grid current flow in
a. V1.
c. V3.
b. V2.
d. V4 and V5.
6. How is the modulating voltage applied to RF amplifier V2?
a. Through L4, in series with the grid voltage
b. Through L4, in parallel with the grid voltage
c. Through T4, in series with the dc plate voltage
d. Through T4, in parallel with the dc plate voltage
SITUATION
Assume that you have been assigned to a transmitter site.
You will be
responsible for maintaining several transmitters in the station.
The schematic
diagram for one of the transmitters is shown in figure 134 of TM 11-665.
Exercises 7 through 14 are based on the above situation.
7. The oscillator stage in this transmitter can best be identified as a
a. modified Hartley oscillator.
b. modified Colpitts oscillator.
c. tuned-plate, tuned-grid oscillator.
d. modified electron-coupled oscillator.
8. Most high-power radio transmitters have meters to permit operators and
maintenance men to electrically monitor the operating conditions of the individual
stages. The meters that measure grid currents are
321 L4
37
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