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Figure 16-4 FM RF
G:;)
o
Electronic
Voltmeter
Oscilloscope
Figure 16-3 S CURVE
Rod Antenna
GND
Figure 16-1 FM IF
ICl
0.011.11"
<D
PIN
10.7 MHz
Dummy
(See Figure 16-6)
Figure 16-2 IF CURVE
10.7 MHz
I'M
Sweep
Generator
®
FM IF/RF ADJUSTMENT
SWITCH
I'M mono
POSITION
SIGNAL
400Hz, 30%, I'M modulated
GENERATOR
TEST
FRE-
DIAL
AD-
STEP
STAGE
QUENCY POINTER
JUST-
REMARKS
SETTING
MENT
1. Using a minus
driver, turn
the core of
T2 counter-
clockwise
1
IF
10.7 MHz
High
T1
before taking
frequency
it out of the
bobbin.
2. Adjust for
best "IF"
curve.
2
Dstec-
T2
Adjust for best
tion
US"
curve.
3
Repeat steps 1 and 2 until no further improvement can
be made,
4
87.3
Lowest
L3
Band
MHz
frequency
I -
coverege
5
108.3
Highest
TC2
MHz
frequency
Adjust for
maximal
6
88 MHz
88 MHz
L2
output.
I -
Tracking
7
108 MHz
108 MHz
TCl
8
Repeat steps 4, 5 and 6, 7 until no further improvement can
be
made.
Rod
Antenna
t
VCO FREQUENCY ADJUSTMENT
SIGNAL
400 Hz, 30%, I'M modulated
GENERATOR
(mono signal)
DIAL
FREQUENCY
POINTER
ADJUST-
REMARKS
SETTING
MENT
I'M mono position
I'M stereo position
(unrnodulatedl
98 MHz at
98 MHz
VRl
Adjust for
60dB
38.00 kHz
±
100 Hz.
Dummy
(See Figure 16-6)
Figure 16-5 VCO FREQUENCY
Rl
, . - - -__-'VVIr--4'P>To Telescopic Rod Antenna
R2
' - - - - - - E i - - - - - T o Chassis GND
Z
=
75 ohms<Rl
=
37.5 ohms
R2
=
75 ohms
Z
=
50 ohms<Rl
=
50 ohms
R2
=
50 ohms
Z: Output Impedance of Signal Generator
Figure 16-6 FM DUMMY
-16 -
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