4 - 3
Main loop
lock voltage
adjustment
L24
Main loop
lock voltage
check point
J5
Reference loop
lock voltage
check point
J4
Reference loop
lock voltage
adjustment
C49
Reference
frequency
check point
P2
Reference
frequency
adjustment
L4
L3
L5
• MAIN AND PLL UNITS
4-3 PLL ADJUSTMENTS
REFERENCE
LOOP LOCK
VOLTAGE
MAIN
LOOP LOCK
VOLTAGE
REFERENCE
FREQUENCY
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
2
1
2
1
2
• Display frequency
: 7.9999 MHz
• Mode
: J3E
• Receiving
• Display frequency : 0.0300 MHz
• Display frequency
: 0.5000 MHz
• Receiving
• Display frequency
: 29.9999 MHz
• Wait for 5 minutes after power ON.
• Terminate P2 on the PLL unit to
ground with a 50
Ω
resister.
• Receiving
PLL
PLL
PLL
Connect a digital
multimeter or oscillo-
scope to check point
J4.
Connect a digital
multimeter or oscillo-
scope to check point
J5.
Connect an RF volt-
meter to check point
P2.
Connect a frequency
counter to check
point P2.
3.2 V
More than 1.5 V
4.0 V
More than 1.0 V
Maximum level
(More than +2 dBm)
60.000000 MHz
PLL
PLL
PLL
C49
Verify
L24
Verify
L4, L5
L3
