Icom IC-W2A Service Manual page 12

4-2
PLL
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
1
LOCATION
UNIT
ADJUST
VHF LOCK
VOLTAGE
1
•Displayed frequency:
145.000
MHz
•Adjust
either
the transmit lock voltage or
receive
lock
voltage (whichever
is
higher).
VRFA
Connect
the
DC
voltmeter
to
the
TUNE
line.
1.6
V VHF RF
LI 6
UHF LOCK
VOLTAGE
1
•Displayed
frequency:
450.000
MHz
(USA)
440.000
MHz
(All
other versions)
•Adjust
either
the transmit lock voltage or
receive
lock
voltage (whichever
is
higher).
UHF RF
Connect
the
DC
voltmeter
to the
LV
line.
3.0
V
VCO
C3
VHF
REFERENCE
FREQUENCY
1
•Displayed
frequency:
145.000
MHz
•Transmitting
Top
panel
!
1
Loosely couple
the
frequency counter
to
the antenna
connector.
145.000
MHz VHF
RF C69
UHF
REFERENCE
FREQUENCY
1
•Displayed
frequency:
440.000
MHz
•Transmitting
440.000
MHz UHF
RF
C61
4-3
RECEIVER
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT
ADJUST
VHF
SENSITIVITY
1
• Displayed
frequency: 145.000
MHz
•Connect
the
SSG
to
the
antenna connector
and
set as:
Level
:
20
pV
(-81
dBm)
MOD.
:
1
kHz
DEV.
:
±3.5 kHz
•[VHF
SQL]
control:
CCW
• Receiving
VHF
RF
Connect
the
oscilloscope
to
the
LSD
line.
Maximum
VRFB
Adjust
in
sequence
L1,L2,
L3
VHF
RF
LI
UHF
SENSITIVITY
1
• Displayed
frequency:
446.000
MHz
(USA)
436.000
MHz
(All
other versions)
•Connect
the
SSG
to
the
antenna
connector
and
set as:
Level
:
10pV(-87dBm)
MOD.
:
1
kHz
DEV.
:
±3.5 kHz
•[UHF SQL]
control:
CCW
• Receiving
UHF RF
Connect
the
oscilloscope
to
the
HSDIine.
Maximum
URF
B
LI: input
L2:
output
2
• Displayed frequency: 440.500
MHz
(USA)
430.500
MHz
(All
other versions)
LI:
output
L2: input
UHF
RF
LI
VHF
S-METER
1
• Displayed frequency: 145.000
MHz
•Connect
the
SSG
to
the
antenna connector
and
set as:
Level
:
0.32
pV
(-1 17
dBm)
MOD.
:
1
kHz
DEV.
:
±3.5 kHz
• Receiving
LCD
display
S/RF
indicator
S3
(4
dots)
VHF
RF R4
UHF
S-METER
1
•Displayed frequency: 440.000
MHz
(USA)
430.000
MHz
(All
other versions)
•Connect
the
SSG
to the
antenna connector
and
set as:
Level
:
0.32
pV
(-1 17
dBm)
MOD.
:
1
kHz
DEV.
:
±3.5 kHz
• Receiving
UHF RF R4
4
—
2