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WQ-T282H/E/Q
©
FM IF/RF ADJUSTMENT
400 Hz, 30%, FM modulated.
TEST
STAGE
best "'IF''
FRE-
DIAL
ee.
MENT
10.7 MHz
curve.
QUENCY
|POINTER
High
frequency
Detection
Adjust for best
*S"" curve.
SETTING
a
steps 1 and 2 until no further improvement can
be made.
87.3 MHz]
Lowest
L3
frequency
SWITCH
POSITION
i
i
ERATOR
1. Using a minus
driver, turn
the core of
T2 counter-
clockwise
before taking
it out of the
bobbin.
2. Adjust for
Band
coverage
Adjust for
maximal
output.
108.3
fat
TC2
MHz
fat
Repeat steps 4 and 5 until no further imporvement
can be made.
Adjust for
maximal
output.
88 MHz
88 MHz
—_
Repeat steps 7 and 8 until no further improvement can
be made.
VCO FREQUENCY ADJUSTMENT
SIGNAL
400 Hz, 30%, FM modulated
GENERA.
TOR
jase
(mono signal)
FREQUENCY
SETTING
MENT
FM mono position
FM stereo position
(unmodulated)
98 MHz
at 60 dB
DIAL
POINTER
Adjust for
38.00 kHz + 100 Hz.
10.7 MHz
FM Sweep
Generator
Oscilloscope
ICc1
0.01uF
(Pin
Figure 18—1
FMIF
10.7 MHz
10.7 MHz
Figure 18—2 AMIF CURVE
Figure 18—3 FMS CURVE
Electronic
FM
Signal
Voltmeter
Rod Antenna
Generator
Dummy
(See Figure 18—6)
Figure 18—4
FM RF
iC3
(6) Pin
1000pF
FM Signal
Counter
Rod Antenna
v4
Dummy
(See Figure 18—6)
Figure 18—5 VCO FREQUENCY
R1
To Telescopic Rod Antenna
To Chassis GND
R1 = 37.5 ohms
2=75 ohms<—
een
R1 = 50 ohms
Z=50
ohms<<
5 means
Z: Output impedance of signal generator
Figure 18—6
FM DUMMY
—18—
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