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OQT-12HS/HR/HB/HY/BL
QT-12ES/ER/EB/EY
THE
INSTRUCTION
OF
FREQUENCY
ADJUSTMENT
In order to comply with FTZ rule: Nr. 478/1981,
please fix the
low end of dial frequency (87.5MHz) and the high end of dial
frequency (107.9MHz)
on FM band, by adjusting oscillation
coils (L3) and oscillation trimmer (TC2), respectively, as illust-
rated in Figure 12—1.
FM
tF/RF
ADJUSTMENT
@
Set the signal generator to produce a signal of 400Hz, 30%,
FM modulated.
@
For adjustment in step 1, see I Note B].
TEST | FRE-
| DIAL | AD-
STEP]
BAND | STA-
|QUEN- | SET-
|JUST-
GE
CY
| TING
|MENT
1F (Connect instruments as shown in Fig. 12—2.)
High
Adjust for
1 | FM
te
end of
ai
best "S"
a
curve.
Figure 12—1
"ge
Adjust for
10.7 MHz
Telescopic
OSRIELOSCOrES
CURVE
maximum
FM SWEEP GENERATOR
Rod Ancenne
dial
output.
NY,
88
88
L2
Track-}
MHz
| MHz
FM STEREO
ADJUSTMENT
@ Set the Band Selector (SW1) to "FM" position and Mode
Figure 12—-3
Selector Switch (SW104) to "STEREO" position.
®
Before this adjustment, connect the anode side of Stereo
*M STEREO
Telescopic
1c3
FREQUENCY
SIGNAL
GENERATOR
Rod Antenna
®pin
1000PF
COUNTER
Indicator (D107) to GND.
f
Pa
'
®
Connect instruments as shown in Fig. 12—4 and Fig. 12—5.
LL
BE
aR
eel
=p
sos
ha
(See Figure 12—5)
DUMMY
t
R1 = 500hm
Z = 50 oh
1&)
ohm <2 = 50 ohm
To Chassis GND
Z: Output impedance of signal generator
When
other
ceramic
filters than
the one
(red) having the
Figure 12-5
FM
DUMMY
central frequency
of 10.7 MHz
are used, note that a marker
(10.7 MHz) of FM sweep generator, if used, will be deviated —
Color Mark
therefore,
adjust the generator by putting off the marker.
10.64 MHz + 30 kHz
frequency (fo)
302
1
Figure 12-6
10.73 MHz + 30 kHz
10.76 MHz + 30 kHz
—~12—
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