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4-2 PLL ADJUSTMENT
TX VCO LOCK
VOLTAGE
RX VCO LOCK
VOLTAGE
REFERENCE
FREQUENCY
1
1
1
2
• LCD display :
A01 LW TXREF 127
• Transmitting
• 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
CP4.
Connect the digital
multi meter or oscillo-
scope to check point
CP3.
Loosely couple a fre-
quency counter to the
[TX] antenna connec-
tor.
Connect the frequency
counter to check point
CP2.
4.0 V
4.0 V
171.7250 MHz
[GEN74]
173.7250 MHz
[Other]
140.2750 MHz
[GEN74]
142.2750 MHz
[Other]
TVCO
RVCO
FRONT
FRONT
C17
C17
[PRT/BASE]
/[MONI]
[PRT/BASE]
/[MONI]
ADJUSTMENT ADJUSTMENT CONDITIONS
UNIT LOCATION
VALUE
UNIT ADJUST
MEASUREMENT ADJUSTMENT
CP4
C17 (TVCO unit)
TX VCO lock voltage
adjustment
CP4
TX VCO lock voltage
check point
CP4
CP18
CP2
CP1
CP3
LV
C17 (RVCO unit)
RX VCO lock voltage
adjustment
CP2
Reference frequency
check point
CP3
RX VCO lock voltage
chack point
CP2
L10
RX UNIT
TX UNIT
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• TX UNIT TOP VIEW
• IC-FR3000 TOP VIEW