6·4 RECEIVER ADJUSTMENT
INSTRUMENTS REQUIRED CONNECTIONS
(1)
VOLTMETER
•INPUT
IMPEDANCE :
50kn/V
DC
OR
BETTER
SSG
(2)
SIGNAL GENERATOR
(SSG)
TO R140, R139, 051,
050
VOLTMETER
• FREQUENCY RANGE
:
0.1
MHz-1
GHz
!
! TO ANTENNA
•OUTPUT
VOLTAGE :
0.1µV-32mV
CONNECTOR
(-127dBm--17dBm)
(3)
AC
MILLIVOLTMETER
• MEASURING
RANGE
:
1omv-1ov
AC
(4)
EXTERNAL SPEAKER
MILLIVOLT-
TO
[EXT SP]
B
•IMPEDANCE
:an
METER
JACK
-
(5)
OSCILLOSCOPE
• FREQUENCY
RANGE :
DC-20MHz
SPEAKER
• MEASURING RANGE
:
o.01-10v
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT ADJUSTMENT CONDITIONS VALUE
UNIT LOCATION
UNIT ADJUST
BPF 1
•Display
freq.: 850.0000MHz
RF
Connect a
12V
RF
R90
TRACKING voltmeter
to
R140.
2
•Display
freq.: 999.0000MHz
Approx. 17V
Verify
3
•Display
freq.: 762.0000MHz Approx. 9.5 V
4
•Display
freq.: 650.0000MHz
6.5V
R89
5
•Display
freq.: 761.0000MHz Approx. 9.5 V
Verify
6
•Display
freq.: 513.0000MHz Approx. 3.5 V
7
•Display
freq.: 350.0000MHz
RF
Connect a
7.5V
RF
R79
•
R77
(RF UNIT): Center voltmeter
to
R139.
8
•Display
freq.: 511.0000 MHz Approx. 17.5V
Verify
9
• Display freq.: 250.0000 MHz
Approx. 2.2V
10
•Display
freq.: 150.0000MHz
RF
Connect a
av
RF
R71
voltmeter
to
D51.
11
•Display
freq.: 90.0000MHz
1V
R73
12
•Display
freq.: 249.0000MHz
Approx. 17.5V
Verify
NOTE: Repeat steps
10,
11
and 12 several times.
13
• Display freq.: 55.0000 MHz
RF
Connect a
6V
RF
R68
•
R66
(RF UNIT): Center voltmeter
to
D50.
14
• Display freq.: 89.0000 MHz
Approx. 9.5 V
Verify
15
•Display
freq.: 25.0000MHz Approx.
3V
IF GAIN
1
•Display
freq.: 762.0000MHz
FRONT
METER Maximum
RF
L57, L58
-
• Mode:
FM
(narrow)
PANEL
2
•Apply
RF
signal
to
ANTENNA
IF L4, L14,
CONNECTOR.
L5,
L6,
Level: 5.0µV
(-93dBm)
L7,
LS
-
Dev.:
±3.5kHz
3
Mod.: 1kHz
REAR
Connect an AC
Maximum
L11
PANEL millivoltmeter
to
[EXT
SP]
JACK with
an
an
speaker.
NOTE: To prevent noise blanker
circuit
malfunction, set the core positions
of
L5
and
L6
to
equal each other.
FM
(wide) 1 • Display freq.: 762.0000 MHz
FRONT
METER
Maximum
IF
L1
• Mode: FM (wide)
PANEL
•Apply
RF
signal
to
ANTENNA
CONNECTOR.
Level: 5.0µV
(-93dBm)
Dev.:
±3.5kHz
Mod.: 1 kHz
6-6
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