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FM ALIGNMENT
CHART
Be generator
Receiver
'A ajus aie
Connect signal generator re
4
Exactly 10.7MHz
The lowest
Connect VITVM (0.1
a 1000 PF capacitor to converter
—
(400Hz, 30%,
frequency range.
voit range DC scaie)
T4
emitter, test point TP1 of Q2.
FM modulated)
between TP2 and
T3
Connect generator ground lead to
chassis ground,
T2
the receiver chassis.
|
|
Tl
Same as Step 1
Exactly 10.7MHz
Same as Step 1.
Connect VIVM (0.1
1
(Unmodulated)
volt range DC scale)
T6
|
between TP3 and
chassis ground,
(See NOTE A)
3
-
Connect signal generator through
Exactly 87.1MHz
Same as Step 1.
Adjust for maxi-
C25
a dummy including output inpe-
(400Hz, 30%,
,
mum output at .
dance of signal generator to the
FM modulated)
7
speaker voice coil.
external antenna.
Ground lead of generator to the
receiver chassis.
(Refer to Figure 3)
4
Same as Step 3.
|
Exactly 98MHz
The highest
Same as Step 3.
(400Hz, 30%,
frequency range.
C9
|
FM modulated)
(98MHz).
|
5
Repeat steps 3 and 4 until no further improvement can be made.
NOTE
A:
1. Connect VTVM (0.1 volt range D.C. scale) between TP3 and chassis ground.
2. Adjust T6 for 0 volt reading on VTVM.
3. Change signal generator frequency 10.7MHz + 100kHz and —100kHz approx.
4. Adjust T7 for balanced peaks. Peak separation should be approx. 200kHz.
on
i
™
OA
VW
AIN
ree
ae'
(ohm)
UR12 50
(ohm)
Re SOlohmM), 25.50
(ohm)
TO
CHASSIS
GROUND
Figure 3 FM Dummy
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