D Optional External Tuner Operation - Icom IC-718 Advanced Manual

2
ADVANCED OPERATIONS
Using an external antenna tuner

D Optional external tuner operation

R DANGER! HIGH VOLTAGE! NEVER touch the
antenna element while tuning or transmitting� Always
place it in a secure place�
CAUTION: DO NOT operate the external antenna
tuner without an antenna connected� The tuner and
transceiver will be damaged�
NEVER operate the external antenna tuner if it is not
grounded�
NOTE: Transmitting before tuning may damage the
transceiver� The AH-4 cannot tune when using a
long wire or multiple of the operating frequency�
AH-4 and AH-730
The AH-4 and AH-730 matches the IC-718 to a long
wire antenna more than 7 m/23 ft long (3�5 MHz and
above)�
• See page 3-4 for connection details�
• See also the antenna tuner's instruction manual for
installation and connection details�
AH-740
The optional AH-740 covers 2�5 to 30 MHz range with
a supplied whip antenna element� Or when using with
the optional NVIS kit, it covers 2�2 to 30 MHz range�
• See page 3-4 for connection details�
• See the AH-740 instruction manual for the
installation and connection details�
Tuner operation
NOTE: Antenna tuning is necessary for each
frequency�
Retune the antenna before transmitting when you
change the frequency, even slightly�
Setting the tuner type
1� Hold down [PWR] for 1 second to turn OFF the
transceiver�
1 ⁄ λ
2
2� While holding down [SET], push [PWR] to enter
the Initial Set mode�
3� Push [UP▲] or [▼DN] to select "TUNER."
4� Rotate [MAIN DIAL] to select "4" (AH-4)�
L Also select "4" when using the AH-730 or AH-740�
5� Hold down [PWR] for 1 second to turn OFF the
transceiver�
6� Push [PWR] to turn ON with the new setting�
Manual tuning
1� Set the operating frequency an HF band�
• The transceiver will not transmit outside the ham
bands�
2� Hold down [TUNER] for 1 second to start a
manual tuning�
• "
• "
been completed�
L When the tuning has not been successful, "
disappears and the antenna tuner is passed through�
L To manually bypass the antenna tuner, push
[TUNER] to turn it OFF�
Tuning indicator
• Blinks while tuning�
• Displayed when the tuning is completed�
• Disappears when the tuning could not be completed�
2-4
" blinks and "CW" is displayed while tuning�
" is continuously displayed when the tuning has
[TUNER]
"