Icom IC-718 - Page 60

5 - 4
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, R64 (PA
unit) to counterclockwise.
• Transmitting
PA 1) Connect a digital
multimeter to the
CP1.
2) Connect an
ammeter (10 A)
between the power
supply and IC-718.
1) Set the voltage to
0.5 V.
2) Measure the idling
current, and note
it as the "initial
value."
PA R51
(for driver) 2 • Transmitting +400 mA
more than the initial value
R56
3 +400 mA
more than the step "2"
R58
(for fi nal amplifi er) 4 • Transmitting +2.0 A
more than the step "3"
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 Connect a digital
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
Connect an RF
power meter to [ANT]
connector.
Maximum output
power
MAIN L106,
L151,
L301,
L302,
L303,
L501
2 • Transmitting 50W 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
Connect an RF
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.
5-3 TRANSMITTER ADJUSTMENTS
Mar. 2010
(Replacement page)