AMANT
L
AMSG
AMSG
TUNER
R
ACVM
P.
C. B.
,
,
REC
GND
OUT
DlST.M
Oscilloscope
o
AM loop antenna
RX-V990
AM Adjustment
(This should be done after
FM
adjustment.)
• Connection Diagram (Measuring instruments)
1) Adjustment of sensitivity
See page 10 for
TP
locations & adjustment points.
Step
Adjustment
item
Signal (ANT IN)
Reception
Adjustment
Test point
Rating
frequency
point
1
Adjustment
of
AMANT
1440kHz
T2
RECOUT
Audio output should be
sensitivity
1440kHz
• (B-3)
maximized.
(1440Hz)
50dBµ
1kHz
30% modulation
2
Verification
of
AMANT
630kHz
T2
RECOUT
Audio output should be
sensitivity
630kHz
• (B-1)
maximized.
(630kHz)
50dBµ
Repeat steps 1 and 2.
1kHz
30% modulation
3
Verification
of
AMANT
630kHz
AMANT
Distortion should be 10% or less at
sensitivity
630kHz
• (B-1)
each frequency.
1080kHz
1080kHz
Check to ensure that the voltage at
1440kHz
• (B-2)
the ANT terminal is 54dBµ or less.
30% modulation
1440kHz
• (B-3)
4
Verification
of auto
AMANT
Auto reception
should
be avail-
tuning
60dBµ
able when the tuning key is moved
UP and DOWN .
• : Execution of FACTORY
PRESET (Refer to page 7.) will facilitate setting reception frequency for adjustment.
13
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