Receiver Adjustment - Icom IC-FR4000 Service Manual

4-3 RECEIVER ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITIONS
RX • LCD display
1
• Connect the standard signal generator
SENSITIVITY
to the [RX] antenna connector and set
as:
Frequency
Level
Modulation
Deviation
• Receiving
REPEATER • LCD display
1
SENSITIVITY • Connect the standard signal generator
to the [RX] antenna connector and set
as:
Frequency
Level
Modulation
Deviation
• Connect the RF power meter to the
[TX] antenna connector.
• Receiving
*The output level of the standard signal generator (SSG) is indicated as the SSG's open circuit.
1: [USA1], [GEN1], [GEN5], [EUR1]
2: [GEN2], [GEN6]
3: [USA3], [GEN3], [GEN7], [EUR3]
• TOP VIEW
UNIT
: A03 LW MRTUN 083
1 4
: 415.0750 MHz ,
2
440.0750 MHz
3 5
465.0750 MHz ,
: 32 µV* (–77 dBm)
: 1 kHz
1 2 3
: ±3 kHz , ,
4 5
±2.4 kHz ,
: A05 LW RPTSQL
FRONT
1 4
: 400.0750 MHz ,
2
430.0750 MHz
3 5
450.0750 MHz ,
: 0.2 µV* (–121 dBm)
: 1 kHz
1 2 3
: ±3 kHz , ,
4 5
±2.4 kHz ,
4: [FRG1]
5: [FRG3]
• RX UNIT TOP VIEW
RX UNIT
CP1
4 - 6
MEASUREMENT
LOCATION
Connect the digital
RX
multi meter or oscillo-
scope to check point
CP18.
Speaker
CP18
CP18
RX sensitivity
chack point
ADJUSTMENT
VALUE
UNIT ADJUST
RX
Maximum
voltage
FRONT
Squelch open [PRT/BASE]
/[MONI]
C11
C12
C10
RX sensitivity
C27
adjustment
C28
C26
C10,
C11,
C12,
C26,
C27,
C28