Icom IC-718 Instruction Manual page 31

ï Optional AH-4
AUTOMATIC ANTENNA TUNER
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 installa-
tion and antenna connection details.
AH-4 setting example:
For mobile operation
For outdoor operation
Long wire
AH-4
IC-718 MODE FILTER TS 4 V/M MW 1 2 A=B 5 M=CL A/B M V 6 3
7 NR SPL . ANF F-INP VOX 0 SCN 8 ENT 9
MIC PHONES PWR AF SQL RIT SHIFT P.AMP NB ATT SET COMP TUNER
LOCK CH UP ∫ DN ∫
R R WARNING: HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting.
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 trans-
ceiver. Note that the AH-4 cannot tune when using a
1⁄2 long wire or multiple of the operating frequency.
operation
TUNER OPERATION
Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency–even slightly.
• Tuner type setting (p.46)
q Push [PWR] for 1 sec. to turn power OFF.
Optional AH-2b w While pushing and holding [SET], push [PWR] to
antenna element
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
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.
• "
e
"
• 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]" oper-
ation and activates first transmission on the new fre-
quency. This function is turned ON in initial set mode
(p. 46).
RECEIVE AND TRANSMIT
AUTOMATIC ANTENNA TUNER
" blinks and "CW" appears while tuning.
lights constantly when tuning is complete.
"
Tuning indicator;
Blinks: Tuning now
Appears: Tune is completed
Disappears: Tune is not completed
5
is selected.
Y Y
[TUNER]
"
29