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5
RECEIVE AND TRANSMIT
The AH-4 matches the IC-718 to a long wire antenna
more than 7 m/23 ft long (3.5 MHz and above).
• See p. 14 for connection.
• See the AH-4 instruction manual for AH-4
installation and antenna connection details.
NEVER operate the AH-4 without an antenna wire.
The tuner and transceiver will be damaged.
NEVER operate the AH-4 when it is ungrounded.
Transmitting before tuning may damage the transceiver.
Note that the AH-4 cannot tune when using a 1⁄2 λ long
wire or multiple of the operating frequency.
TUNER OPERATION
• Tuner type setting (p.46)
q Push [PWR] for 1 sec. to turn power OFF.
w While pushing and holding [SET], push [PWR] to
turn power ON.
e Push [UP Y] or [Z DN] one or more times to
select [TUNER].
r Rotate the main dial to select “4”.
• AH-4 AUTOMATIC ANTENNA TUNER is selected.
y Push [PWR] for 1 sec. to turn power OFF.
u Push [PWR] to turn power ON again.
• MANUAL TUNING
q Set the desired frequency in an HF band.
• The IC-718 will not transmit outside of the ham bands,
the AH-4 tuner will tune all frequencies 3.5 to 30 MHz.
w Push and hold [TUNER] for 1 sec.
• “ ” blinks and “CW” appears while tuning.
e “ ” lights constantly when tuning is complete.
• When the connected wire cannot be tuned, the “ ”
goes out, the AH-4 is bypassed and the antenna wire
is connected to the antenna connector on the
transceiver directly.
r To bypass the AH-4 manually, push [TUNER].
CONVENIENT
• PTT tune function
The AH-4 is always tuned when the PTT is pushed
after the frequency is changed (more than 1%).
This function removes the “push and hold [TUNER]”
operation and activates first transmission on the new
frequency. This function is turned ON in initial set
mode (p. 46).
For mobile operation
For outdoor operation
Long wire
Optional AH-2b
antenna element
AH-4
R WARNING: HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting.
Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency–even slightly.
Y
Y
[TUNER]
ï Optional AH-4 AUTOMATIC ANTENNA TUNER operation
Tuning indicator;
Blinks: Tuning now
Appears: Tune is completed
Disappears: Tune is not completed
AH-4 setting example: