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<AM Adjustment>
Make the following preparations for AM adjustment.
Preparations
•
Standard Signal Generator (S.S.G.) / Loop antenna / Oscilloscope / Millivoltmeter / Dummy resistance (6
Ω
)
1) Connect the unit and measuring instruments as shown in the diagram below.
2) Position the loop antenna connected to S.S.G. and the one connected to the unit 60 cm apart.
4. IF Adjustment
Requirements: As instructed in preparations.
•
Adjustment point: L802
1) Set S.S.G. to AM; carrier of 1000 kHz with 30 % modulation, and source at 1 kHz.
2) Tune the receiving frequency of the unit at AM 1000 kHz.
3) While monitoring the waveform at 1 kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree
of noise is monitored).
4) Adjust L802 so that the millivoltmeter points maximum.
5. Tracking Adjustment
Requirements: As instructed in preparations.
•
Adjustment point: L951
1) Set S.S.G. to AM; carrier of 1000 kHz with 30 % modulation, and source at 1 kHz.
2) Tune the receiving frequency of the unit at AM 1000 kHz.
3) While monitoring the waveform at 1 kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree
of noise is monitored).
4) Adjust L951 so that the millivoltmeter points maximum.
6. Auto-Stop Check
Requirements: As instructed in preparations.
1) Set S.S.G. to AM; carrier of 1000 kHz with 30 % modulation, source at 1 kHz, and output of 37 ~ 62 dBuV.
2) Apply the tuning search function, and check that the unit automatically stops at AM 1000 kHz.
ADJUSTMENT -3/7
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