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8.2
AM TUNER
1. Connect
up the test instruments as shown
in
9. Set the SX-680 dial indication and AM SG fre-
Fig. 8.
quency for 600kHz.
2. Set the FUNCTION
switch to AM.
10. Adjust T; and bar antenna core for maximum
3. Set AM
Signal Generator (AM SG) for 400Hz
reading on AC voltmeter.
380% modulation 100dB output.
11. Set the SX-680 dial indication and AM SG fre-
4. Set the SX-680 dial indication and AM SG fre-
quency for 1,400kHz.
quency for 600kHz.
;
12. Adjust TC, and TC, for maximum reading on
5. Adjust T; core for maximum
reading on AC
AC voltmeter.
voltmeter.
13. Repeat steps 9 to 12, alternately until adjust- ~
6. Set the SX-680 dial indication and AM SG fre-
quency for 1400kHz.
7. Adjust TC, for maximum
reading on AC volt-
14
meter.
8. Set AM SG for 30dB output.
AM signal generator
AM ANT TERMINAL
aqic>
1kQ resistor
Oscilloscope
AC voltmeter
O000
|
Fig. 8 Connection diagram
ment at the one frequency requires no further
re-adjustment at the other frequency.
. Adjust F, core for give the maximum
reading
on the AC voltmeter.
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