Optional External Tuner Operation; D Before Operating The Ah-4 Or; D Operating The Ah-4 Or; D Antenna Tuner Of The Ic-Pw1/Euro - Icom IC-7600 Instruction Manual

• Automatic tuner start (HF bands only)
If you want to deactivate the tuner under conditions
of VSWR 1.5:1 or less, use the auto tuner start
function and turn the tuner OFF. This function
activates the tuner automatically when the SWR is
high, and is controlled in set mode. (p. 138)
• The tuner may not be activated if the TX power is not
output stably longer than the specified time period as the
SSB or CW mode operation.

Optional external tuner operation

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D Before operating the AH-4 or AH-740
R DANGER! HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting. Always place it in a secure place.
NEVER operate the AH-4 or AH-740 without an
antenna connected. The tuner and transceiver will be
damaged.
NEVER operate the AH-4 or AH-740 when it is
ungrounded.
Transmitting before tuning may damage the
transceiver.
Note that the AH-4 or AH-740 cannot tune when
using a ½λ long wire or on a multiple of that
frequency.
See page 21 for the transceiver and AH-4 or AH-740
connection.
ANTENNA TUNER OPERATION
• PTT tuner start
Tuning of the internal*/external antenna tuner starts
when [PTT] is pushed on a new frequency (more
than 1% away from the last-tuned frequency).
This function removes the "hold down [TUNER]"
operation and activates for the first transmission on
a new frequency.
*Tuning starts if the internal antenna tuner is ON.
This function is turned ON in set mode. (p. 138)
D Operating the AH-4 or AH-740
Tuning is required for each frequency. Be sure to
retune the antenna before transmitting when you
change the frequency— even slightly.
q Set the desired frequency in an HF or 50 MHz
band for use with the AH-4 or AH-740.
• The AH-4 or AH-740 will not operate on
frequencies outside of ham bands.
w Hold down [TUNER] for 1 second.
• The indicator on the switch blinks while tuning.
TUNER
e The indicator on the switch lights constantly when
tuning is complete.
• When the connected wire cannot be tuned, the
indicator on the switch goes out and the AH-4 or
AH-740 is bypassed. At that point the antenna
wire connection is to the transceiver directly, and
not via the AH-4 or AH-740 antenna tuner.
r To bypass the AH-4 or AH-740 manually, push
[TUNER].
NOTE: PTT tuner function is also available.
See page 138 for details.

D Antenna tuner of the IC-PW1/EURO

When using an external antenna tuner such as the
IC-PW1/EURO's tuner, tune with the external antenna
tuner, while the internal tuner is turned OFF. After
tuning is completed, turn the internal tuner ON.
Otherwise, both tuners tune simultaneously and
correct tuning may not be obtained.
See the instruction manual included with each
antenna tuner for their respective operations.
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