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| ST-55
ST-55
|
1. Set function switch to AM.
2. Set signal generator frequency as listed in TABLE
2 MW ADJUSTMENT
CHART.
3. Proceed as oulined in the TABLE 2 MW ADJUSTMENT
CHART.
TABLE 2 AM ADJUSTMENT CHART
Signal
Signal
Display
Generator
Generator
Ee auency
Connection
Adjustment
Remarks
Connection
Frequency
vee
603 KHz
TP AM R101
|
3.7V
1602 KHz
TC12
1
Test Loop
603 kHz
603 kHz
ET MPactoss 6, TL TOT AMS
ed juet Tol
Output
Right Side
Maximum
9
Tasvicoop
1404 kHz
1404 kHz
VTVM across
MW Aer. Trim.
Adjust for
Output
TC11
Maximum
Repeat above steps until no futher improvement ts noticed.
-_
Aerial
Loop
24 inches
Oo!
AM
Antenna
(63 cm)
VTVTM
Oscilloscope
Figure 7
mt)
Antenna Coil
o-
O
ST-55
po
ee
r
lm
ons Ade
Output Terminal
AM ADJUSTMENT
es
Test equipments/Tools required
Figure 9
1. Signal generator (with frequency counter)
4. Adjusting screwdriver
FM IF ADJUSTMENT
2. Sweep generator
5. Oscilloscope
1. Set function switch to FM.
3. Test loop Aerial
2. Set signal generator frequency as listed in TABLE 4 FM IF ADJUSTMENT CHART.
3. Proceed as outlined in the TABLE 4 FM IF ADJUSTMENT
CHART.
IF ADJUSTMENT
cael
Adjusts the scope pattern with specified marker (450 kHz) as illustrated in Fig. 8.
VTVM
or
Oscilloscope
Connection
Signal
Signal
Generator
Generator
Connection
Frequency
Display
Frequency
Adjustment
Remarks
Connect FM
T7201
BLK
Adjust for
Connect
signal
VTVM to
Test Point
generator to
R993
FM-IF
FM Aerial
98.000 MHz
:
Voltage 0 V
Terminal.
60 dB
|
7
Connect the
VTVM
T7201
BLK
Adjust for
modulator to
across
Minimum
T001
TOO3
VTVM
to
TO002
Adjust for
signal generator.
Output
Distortion
Repeat steps 1 and 2.
Connect signal
Figure 8
generator to
90 MHz
90.000 MHz
F
FM Antenna
106.000 MHz
106 MHz
Output
TCO1 TC103
maximum
Terminal.
TCO2
Repeat steps 3 and 4.
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