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4 - 4
4-4 TRANSMITTER ADJUSTMENTS
IDLING
CURRENT
(For drive
transistors)
(For final
transistors)
IC APC
SWR
DETECTOR
TRANSMIT
PEAK
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
2
1
1
2
1
• Display frequency
: 12.2300 MHz
• Mode
: J3E
•
Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
• Display frequency
: 12.2300 MHz
• Mode
: J3E
•
Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
• Display frequency : 22.0000 MHz
• Mode
: J3E
• Preset R31 on the PA150W board
to the maximum counterclockwise
position.
• Connect a dummy load (10 A)
between lead of R35 (power line)
and EP9 (power ground) on the
PA150W board.
• Connect an audio generator to the
[MICROPHONE] connector and set
as:
Frequency
: 1.5 kHz
Level
: 100 mV rms
• Connect an RF power meter to the
[ANT] connector.
• Transmitting
• Display frequency : 22.0000 MHz
• Mode
: J3E
• Ground the lead of R545 on the
MAIN unit with a wire.
• Connect an audio generator to the
[MICROPHONE] connector and set
as:
Frequency
: 1.5 kHz
• Transmitting
• Display frequency : 12.2300 MHz
• Mode
: J3E
• Ground the lead of R545 on the
MAIN unit with a wire.
• Connect an audio generator to the
[MICROPHONE] connector and set
as:
Frequency
: 1.5 kHz
Level
: 3 mV
• Transmitting
PA150W
PA150W
Rear
Panel
Rear
Panel
MAIN
Rear
Panel
Cut the lead wire
(W11) and connect a
DC ammeter (1 A) to
the cut points.
Unsolder R26 and
connect the DC
ammeter (3 A) to the
unsoldered points.
Connect a DC
ammeter (50 A)
between the DC
power supply and DC
power receptacle
(DC input +).
Connect an RF
power meter to the
[ANT] connector.
Connect a DC volt-
meter to R150.
Connect an RF
power meter to the
[ANT] connector.
100 mA
500 mA
30 A
140 W
Minimum level
Maximum output power
PA150W
PA150W
PA150W
Audio
genera-
tor
FILTER
MAIN
R22
R25
R31
Output
level
C92
Adjust in
sequence
L89, L88,
L65, L64,
L59
After adjustment, re-solder the lead wire (W11) on the PA150W board.
After adjustment, re-solder R26 on the PA150W board.
After adjustment, remove the dummy load.
After adjustment, remove the wire from R545 on the MAIN unit.
After adjustment, remove the wire from R545 on the MAIN unit.