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6-(2) AM
Section
IF Stage
1.
Connect an output of sweep generator to the AM input Tab No. 113.
2.
Set the sweep generator to 455 kHz.
3.
Connect an input of sweep generator to the AM output (11th Pin of 1C401). Refer to Fig. 29.
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4
Adjust the blue and red cores of |.F. Transformer T401 so that the output is maximized.
Refer to Fig. 24.
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IF OUT
Fig. 24
Tracking and Sensitivity
Low Frequency
1.
Connect an RF generator to the antenna terminals on the rear panel, set this to 600 kHz with 30 % modulation at
400 Hz.
2.
Connect an AC VTVM and an oscilloscope to Rec. Out Jacks on the rear panel.
3.
Set the dial pointer to 600 kHz.
4.
Adjust Osc. transformer L403 and the ferrite bar antenna to maximize the output signal.
High Frequency
5.
Set the RF generator to 1 400 kHz with 30 % modulation at 400 Hz.
6.
Set the dial pointer to 1 400 kHz.
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Adjust the trimmers TC4 and TC2 in the AM tuning gang so that the output signal is maximized.
8.
Repeat these high and low frequency adjustments alternately until maximum sensitivity is obtained.
JR-S81
No. 2431
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