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