— 11 —
TUNER SECTION
0 dB=1µV
AM Tuning Voltage Adjustment
Procedure:
1.
Set the reception frequency of the unit to 530 kHz.
2.
Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.
3.
Set the reception frequency of the unit to 1,710 kHz.
4.
Confirm that the voltage reading on the DC voltmeter is within
8.0 ± 0.5 V.
Adjustment Location: MAIN board (See page 12)
AM Tracking Adjustment
Procedure:
1.
Tune the set to 600 kHz.
2.
Set the output of AM RF SSG so that the input level of the set
will become 60 dB (µV/m).
3.
Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.
4.
Tune the set to 1,400 kHz.
5.
Adjust TC102 so that when the waveform on the oscilloscope
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: MAIN board (See page 12)
FM Tuning Voltage Adjustment
DC voltmeter
Procedure :
1.
Set the reception frequency of the unit to 87.5 MHz.
2.
Adjust L103 for 1.2 ± 0.05V reading on the DC voltmeter.
3.
Set the reception frequency of the unit to 108 MHz.
4.
Confirm that the voltage reading on the DC voltmeter is within
7.8 ± 0.5V.
Adjustment Location: MAIN board (See page 12)
TP1
+
IF
G
VT
Main board
DC voltmeter
Main board
–
F
G
VT
TP1
+
–
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
60 cm
AM ANTENNA
terminal (TM1)
30% amplitude
modulation by
400 Hz signal
Field strength dB (
µ
V/m) =SSG output level dB (
µ
V/m) –26 dB.
