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1
5-3 TRANSMITTER ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT ADJUST
IDLING
CURRENT
(for pre-driver)
1 • Display frequency : 14.10000 MHz
• Mode
: USB
• RF power
: Minimum (L)
• Mic gain
: Minimum (0)
• Disconnect J3601 (MAIN unit) and
preset R51, R56, R58, R62, R64
(PA unit) to counter clockwise.
• Transmitting
PA
C o n n e c t a d i g i t a l
multimeter to the CP1.
S e t t h e vo l t a g e
between CP1 and
GND to 0.5 V.
PA
R51
(for driver)
1 • Transmitting
PA
Connect an ammeter
(10 A) between the
p o w e r s u p p l y a n d
IC-718.
At the point where
t h e T x c u r r e n t
increases 800 mA.
PA
R56
2
At the point where the
Tx current increases
another 800 mA.
R58
(for fi nal amplifi er) 1 • Transmitting
PA
At the point where
t h e T x c u r r e n t
increases 800 mA.
PA
R62
2
At the point where the
Tx current increases
another 800 mA.
R64
After the "
IDLING CURRENT"
adjustment, recover the connection of J3601.
SWR
DETECTOR
1 • Display frequency : 14.10000 MHz
• Mode
: USB
• RF power
: Maximum (H)
• Connect J4 (FILTER unit) to GND.
• Connect an audio generator to
[MIC] connector and set as;
Frequency
: 1.5 kHz
Level
: 30 mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
100 W
Front
panel
Mic gain
control
in the
"quick set
mode."
2 • Transmitting
FILTER C o n n e c t a d i g i t a l
multimeter to J5.
Minimum voltage
FILTER
C17
After the "
SWR DETECTOR"
adjustment, recover the connection of J4.
TRANSMITTER
TOTAL GAIN
1 • Display frequency : 14.10000 MHz
• Mode
: USB
• RF power
: Maximum (H)
• R2701 (MAIN unit) : Center
• Mic gain
: Center (50)
• Connect an audio generator to
[MIC] connector and set as;
Frequency
: 1.5 kHz
Level
: 3 mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
Maximum output
power
MAIN
L106,
L151,
L301,
L302,
L303,
L501
2 • Transmitting
50 W
R503
OUTPUT
POWER
1 • Display frequency : 14.10000 MHz
• Mode
: USB
• RF power
: Maximum (H)
• Mic gain
: Center (50)
• Connect an audio generator to
[MIC] connector and set as;
Frequency
: 1.5 kHz
Level
: 30 mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
100 W
MAIN
R1707
Ic APC
1 • Display frequency : 3.55000 MHz
• Mode
: USB
• RF power
: Maximum (H)
• Mic gain
: Center (50)
• Connect CP4002 (MAIN unit)
to GND.
• Connect an audio generator to
[MIC] connector and set as;
Frequency
: 1.5 kHz
Level
: 30 mVrms
• Transmitting
Rear
panel
Connect an ammeter
(30 A) between power
supply and the IC-718.
22 A
MAIN
R1720
After the "
Ic APC"
adjustment, recover the connection of CP4002.
Oct. 2007
TRANSMITTER ADJUSTMENTS for PA UNIT "B-5380I"
Summary of Contents for IC-718
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