Transmitter; Adjustment - Icom IC-04A Service Manual

6-5
TRANSMITTER
ADJUSTMENT
TEST INSTRUMENTS REQUIRED
(1)
VOLTAGE REGULATED
POWER
SUPPLY
(2)
RF
POWER
METERITERMINATED
TYPE)
(4)
AC
MILLI-
VOLTMETER
(6|
AMMETER
O)
AUDIO GENERATOR
(10)
ATTENUATOR
(14)
FM
DEVIATION METER
ADJUSTMENT ADJUSTMENT
CONDITIONS
MEASUREMENT ADJUSTMENT
POINT
UNIT LOCATION UNIT ADJUST
OUTPUT
POWER
(K)
• Operating frequency; 439.000MHz
445.000MHz (#05)
•
RF
OUTPUT POWER
SELECTOR
SWITCH: HIGH
•
Power
supply: 13.2V
• Simplex
mode
•
Transmit
mode
TOP
PANEL
Connect
an
RF power
meter
to the
ANTENNA
CON-
NECTOR.
5.0W
PLL
H
2
Ammeter
Less
than
1
.
SA
Verify
3
•
RF
OUTPUT POWER
SELECTOR
SWITCH:
LOW
• Transmit
mode
Connect an RF power
meter
to the
ANTENNA
CON-
NECTOR.
0.5W
Less than
0.
7
R267
4
Ammeter
Less than
700mA
Verify
5
•
RF
OUTPUT POWER
SELECTOR
SWITCH:
HIGE
•
Power
supply:
8.
4V
•
T
ransmit
mods
Connect an
RF power
meter
to the
ANTENNA
CON-
NECTOR.
More
than
2.5W
Verify
S/RF
INDICATOR
(U
• Operating frequency;
445.000MHz
435.
OOOMHz
(#04)
•
RF
OUTPUT POWER
SELECTOR
SWITCH; HIGH
•
Transmit
mode
FRONT
PANEL
S/RF
INDICATOR
Full
scale Verify
2
•
RF
OUTPUT POWER
SELECTOR
SWITCH:
LOW
•
Transmit
mode
7
±2
dots
Verify
DEVIATION
IM)
•
Operating frequency:
435.
OOOMHz
445.000MHz
(#05)
•
RF
OUTPUT POWER
SELECTOR
SWITCH; HIGH
• Apply an
AF
signal to
the
EXTERNAL
MIC
JACK
Level:
1kHz/70mV
170mV
(#05)
•
Transmit
mode
TOP
PANEL
Connect an
FM
deviation
meter to the
ANTENNA
CONNECTOR
via
an
atte-
nuator.
±5kHz
PLL
R226
2
• Verify both
band edges ±5kHz ±10%
Verify.
6-4