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QT-27H(R)
©
AM IF/RF
SIGNAL
400 Hz, 30%, AM modulated
GENERATOR
TEST
FRE-
DIAL
AD-
STEP;
STAGE
; QUENCY | POINTER | JUST-
SETTING
| MENT
Adjust for
best "IF curve.
frequency
468 kHz
145 kHz | Lowest
Band
frequency
Adjust for
coverage
Highest
frequency
maximal
maximal
Repeat steps 2 and 3 until no further improvement can be
ea
a
output.
made.
170 kHz
| 170 kHz
Repeat steps 5 and 6 until no further improvement can
be made.
Tracking
270 kHz
| 270 kHz
PM
RE
RF
Adjust for
Lowest
frequency
Adjust for
maximal
output.
Band
coverage
Highest
| -fesuenes
il
steps 8 and 9 until no further improvement
can be made.
maximal
Tracking
1,400 kHa
1
| 1,400 kHz
kHz) TCA
| 1,400 kHz] TC4 | output,
Repeat steps 11 and 12 until no further improvement
can be
ee
Adjust for
PSWRE
RF
Lowest
frequency
Adjust for
Band
;
maximal
rie
Highest
| TC6
frequency
1
—
steps 14 and 15 until no further improvement can be
mad
Tracking
maximal
16 MHz
16 MHz TC3
output.
_ ~ Le)
Repeat steps 17 and 18 until no further improvement
can be made.
CIRCUIT ADJUSTMENT (TUNER SECTION)
Oscilloscope
MW/LW
IC3
(4) Pin
Test
Loop'
Bar Antenna
Sweep
Generator
Figure 10—1
AM IF
455 kHz
Figure 10—2 AMIF CURVE
Electronic
Bar Antenna
Signal
Generator
Figure 10—3 MW RF
Figure 10—4
SW RF
§—=. To Telescopic Rod Antenna
soe a
|
C
R = 30 ohms
Z= 50 ohms<—_
= 12 pF
Z: Output Impedance Of Signal Generator
To Chassis GND
Figure 10-5 SW DUMMY
VCO.
IC 3
{
Ff
(Pin
6Pin
Figure 10-6 ADJUSTMENT POINTS
—10—
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