Lesson 4
PRACTICE EXERCISE
1.
What is supplied from the servo circuits to actuate the switch between the RF out stage and the
head amplifier stage?
a.
Frame pulse
b.
Field pulse
c.
Fullwave signal
d.
Halfwave signal
2.
Transistor Q3 is a power supply regulator which reduces the -12V supply voltage to what voltage
level?
a.
-10.5V
b.
-8V
c.
-6V
d.
-4.5V
3.
What amount of limiting is provided by the limiter to remove AM components from the RF
signal?
a.
20 dB
b.
15 dB
c.
10 dB
d.
5 dB
4.
On the HF-3 board (fig 3-4 (fo), Transistors Q2 and Q3 are what type of amplifier?
a.
Class A
b.
Class C
c.
Push-pull
d.
Differential
5.
What resistor on the DM-7 board (fig 4-2 (fo)) sets the reference level of the demodulated RF?
a.
R2
b.
R6
c.
R12
d.
R15
6.
Which IC on board DM-7 (fig 4-2 (fo)), is the Y-RF signal supplied?
a.
IC-1
b.
IC-2
c.
IC-3
d.
IC-4
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