DSP-AX1/RX-V1
DSP-AX1/RX-V1
35
FM Adjustment
● Before Adjustment
1) For dB, 1µV=0dBµ
Example : 60dBµ=1mV
2) 100% modulation means that the frequency deviation is
± 75kHz.
3) Install the Matching Transformer and connect FM SG.
4) Set each switch to the following position unless other-
wise specified.
INPUT SELECTOR.................. TUNER
TUNING MODE ....................... AUTO
● Connection diagram (Measuring instruments)
1) Discriminator balance adjustment
3) Stereo distortion adjustment/separation adjustment
2) Monaural distortion adjustment
4) Sensitivity Verification
Step
1
2
3
4
5
Test point
Both ends of R25
(Between TP1 and TP2)
REC OUT L, R
Both ends of R25
(Between TP1 and TP2)
REC OUT L, R
Both ends of R25
(Between TP1 and TP2)
Rating
DC 0V±100mV
Minimize the dis-
tortion.
DC 0V±50mV
Minimize the dis-
tortion (to 0.25%
or less).
DC 0V±50mV
Adjustment item
Rough adjustment of
discriminator balance
Rough adjustment of
monaural distortion
Fine adjustment of
discriminator balance
Fine adjustment of
monaural distortion
Verification of dis-
criminator balance
Signal (ANT IN)
FM ANT (75Ω)
98.1MHz ± 5kHz
70dBµ
MONO 100Hz
100% modulation
Same as Step 1.
Same as Step 1.
Same as Step 1.
Same as Step 1.
Reception
frequency
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
Adjustment
point
T1
(IC side core)
T1
(Antenna side core)
T1
(IC side core)
T1
(Antenna side core)
T1
(IC side core)
*:Execution of PRESET (Refer to page 27.) will facilitate setting reception frequency for adjustment.
R25
GND
FM
ANT
FM
dummy
antenna
Oscillator
FM
SG
TUNER
P. C. B .
DCVM
TP1
TP2
GND
FM
ANT
FM
dummy
antenna
Oscillator
FM
SG
TUNER
P. C. B .
Oscilloscope
DIST. M
L
R
REC
OUT
GND
FM
ANT
FM
dummy
antenna
SSG
FM
SG
TUNER
P. C.. B.
Oscilloscope
DIST. M
L
R
REC
OUT
YLF-15
(LPF)
ACVM
GND
FM
ANT
FM
dummy
antenna
FM
SG
TUNER
P. C. B .
Oscilloscope
DIST. M
L
R
REC
OUT
ACVM
See page 34 for TP locations & adjustment points.
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