Transmitter Adjustment - Icom IC-M710 Service Manual

TRANSMITTER ADJUSTMENTS (continued)
ADJUSTMENT ADJUSTMENT CONDITION
TRANSMIT 1 • Display frequency : 12.2300 MHz
• Mode
GAIN
• Transmitting
2 • Display frequency : 16.3650 MHz
• Transmitting
1 • Display frequency : 12.2300 MHz
OUTPUT
• Mode
POWER
• Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
2 • Mode
• Transmitting
3 • Mode
• Transmitting
1 • Display frequency : 12.2300 MHz
CARRIER
• Mode
SUPPRESSION
• Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
1 • Display frequency : 12.2300 MHz
TUNE
• Ground the lead of L108 (KEY
POWER
line) on the MAIN unit with a wire.
• Transmitting
1 • While pushing the [SQL] and [TX]
POWER
METER switches, turn power ON.
• Display frequency : 12.2300 MHz
• Mode
• Connect an audio generator to the
[MICROPHONE] connector and
set as:
Frequency
Level
2 • Set the transmit power level:
[GEN] versions : PO-1
[EUR] versions : PO-3
• Transmitting
1 • Display frequency : 12.2300 MHz
MIC
• Mode
LIMITTER
• Disconnect the BFO plug (J5) on
for
the MAIN unit.
[GMDSS],
• Connect an audio generator to the
[EUR]
[MICROPHONE] connector and
set as:
Frequency
Level
• Transmitting
After adjustment, connect the BFO plug to the J5 on the MAIN unit.
1
• Display frequency :12.2300 MHz
MIC GAIN
• Mode
• Connect an audio generator to the
[MICROPHONE] connector and
set as:
Frequency
Level
• Transmitting
[GEN]: [GEN-21], [GEN-22], [GEN-23]
[GMDSS]: [GEN-23], [EUR-22]
MEASUREMENT
UNIT
Rear C o n n e c t a n R F
: A1A [Others] Panel power meter to the
F1A [GMDSS] [ANT] connector.
MAIN Connect a digital
multimeter to R159.
Rear C o n n e c t a n R F
: H3E Panel power meter to the
[ANT] connector.
: R3E
: F1B [GMDSS]
A1A [Others]
Rear Connect a spectrum
: J3E Panel analyzer or RF volt-
meter to the [ANT]
connector via an
attenuator.
Rear C o n n e c t a n R F
Panel power meter to the
[ANT] connector.
Rear C o n n e c t a n R F
Panel power meter to the
[ANT] connector.
: J3E
: 1.5 kHz
: 100 mV
MAIN Connect an oscil-
: J3E loscope to R243.
: 1.5 kHz
: 150 mV
C o n n e c t a n R F
Rear
meter to the [ANT]
: J3E Panel
connector.
: 1.5 kHz
: 10 mV
[EUR]: [EUR-21], [EUR-22]
4 - 6
VALUE
LOCATION
140 W
0.5 V
45 W
2.0 W
130 W [GMDSS]
140 W [Others]
Minimum carrier level
(Less than –40 dB)
10 W
[GEN] versions: 17 W
[EUR] versions: 120 W
Push the [DIMMER]
switch.
130 mV
PEP
100 W
ADJUSTMENT
POINT
UNIT ADJUST
MAIN R184
R26
MAIN R211
R212
R184
MAIN Adjust
alternately
R238,
R844
MAIN R205
Audio Output
generator level
Font [DIMMER]
Panel
LOGIC R2070
LOGIC R2066