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ANTENNA TUNER OPERATION
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•AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER
The optional AH-4 matches the IC-7410 to a long
wire antenna more than 7 m/23 ft long (3.5 MHz and
above).
•Seepage18forthe transceiver and AH-4connec-
tion.
•SeetheAH-4instructionmanualforAH-4installation
and antenna connection details.
AH-4 setting example:
For mobile operation
For outdoor operation
Long wire
Optional AH-2b
antenna element
R DANGER: HIGH VOLTAGE!
NEVER touch the antenna element while tuning
or transmitting.
CAUTION: NEVER operate the AH-4 without an
antenna wire or element. The tuner and transceiver will
be damaged.
NEVER operate the AH-4 when it is not grounded.
Transmitting before tuning may damage the trans-
ceiver. Note that the AH-4 cannot tune when using a
1
⁄2 λ long wire or multiple of the operating frequency.
When connecting the AH-4, the antenna connector
assignments are [ANT2] for the internal tuner and
[ANT1] for the AH-4. The antenna icon in the LCD
displays “ANT” when the AH-4 is connected and se-
lected.
•AH-4 operation
Tuning is required for each frequency. Be sure to re-
tune the antenna before transmitting when you change
the frequency— even slightly.
q Select the desired frequency for use with the AH-4.
•TheAH-4willnotoperateonfrequenciesoutside
the ham bands.
w Hold down [TUNER] for 1 second.
•
“ ” blinks while tuning.
e “ ” appears constantly when tuning is com-
plete.
•Whenthewireantennacannotbetuned,“ ” disap-
pears and the AH-4 is bypassed. At that point the an-
tenna wire connection root is to the transceiver directly,
and not via the AH-4 antenna tuner.
r
To bypass the AH-4 manually, push [TUNER].
• Antenna tuner of the IC-PW1/EURO
When using an external antenna tuner such as that
in the IC-PW1/EURO, tune when the internal tuner is
turned OFF. After the antenna has been matched, turn
ON the internal tuner.
Otherwise, both tuners simultaneously tune, and
proper antenna matching may fail.
See the instruction manual included with each antenna
tuner for their respective operations.
■ Optional external tuner operation
• Automatic tuner start (HF bands only)
If you want to deactivate the tuner when the VSWR
is 1.5:1 or less, use the Auto Tuner Start function
and turn OFF the tuner. This function activates the
tuner automatically when the SWR is high, and is
controlled in the Set mode. (p. 86).
•The tuner may not be activated if the TX power output
is not stable longer than the specified time period in the
SSB or CW mode operation.
• PTT tuner start
Tuning of the internal*/external antenna tuner starts
when [PTT] is pushed on a new frequency that is
more than 1% away from the last-tuned frequency.
This function removes the “holding down [TUNER]”
operation, and starts tuning on the first transmission
on a new frequency.
This function is turned ON in the Set mode. (p. 87).
*Tuning starts if the internal antenna tuner is ON.
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