Icom IC-FR4000 - PLL and Reference Frequency Adjustments

4 - 5
4-2 PLL ADJUSTMENT
TX VCO LOCK
VOLTAGE
RX VCO LOCK
VOLTAGE
REFERENCE
FREQUENCY
1
1
1
2
• LCD display :
A01 LW TXREF 127
• Receiving
• LCD display :
A01 LW TXREF 127
• Receiving
• Wait for 5 minutes after power ON.
• LCD display : A01 LW TXREF
• Connect the RF power meter or 50 Ω
dummy load to the [TX] antenna con-
nector.
• Transmitting
• Push the [PROG] button.
• LCD display :
A01 LW RXREF
• Receiving
TX
RX
REAR
panel
RX
Connect the digital
multi meter or oscillo-
scope to check point
CP1.
Connect the digital
multi meter or oscillo-
scope to check point
CP1.
Loosely couple the
frequency counter to
the [TX] antenna con-
nector.
Connect the frequen-
cy counter to check
point HJ4.
1.0 V 1, 2, 4
0.8 V 3, 5
4.3 V
1, 3, 4, 5
3.5 V
2
400.2750 MHz
1, 4
430.2750 MHz
2
450.2750 MHz
3, 5
359.2750 MHz
1, 4
379.9250 MHz
2
409.9250 MHz
3, 5
TVCO
RVCO
FRONT
FRONT
C17
C17
[PRT/BASE]
/[MONI]
[PRT/BASE]
/[MONI]
ADJUSTMENT ADJUSTMENT CONDITIONS
UNIT LOCATION
VALUE
UNIT ADJUST
MEASUREMENT ADJUSTMENT
RX UNIT
TX UNIT
CP1
C17
TX VCO lock voltage
adjustment
CP1
TX VCO lock voltage
check point
CP18
HJ4
CP1
C17
RX VCO lock voltage
adjustment
HJ4
Reference frequency
check point
CP1
RX VCO lock
voltage chack point
• TOP VIEW
• RX UNIT TOP VIEW
• TX UNIT TOP VIEW
1: [USA1], [GEN1], [GEN5], [EUR1] 4: [FRG1]
2: [GEN2], [GEN6] 5: [FRG3]
3: [USA3], [GEN3], [GEN7], [EUR3]