Optional External Tuner Operation; Antenna Tuner Operation - 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 func-
tion and turn the tuner OFF. This function activates
the tuner automatically when the SWR is high.
This function is controlled in set mode. (p. 129).
• The tuner may not be activated if the TX power is not
output stably longer than the specified time period as
SSB or CW mode operation.

Optional external tuner operation

• AH-4 HF AUTOMATIC ANTENNA TUNER
The AH-4 matches the IC-7600 to a long wire antenna
more than 7 m/23 ft long (3.5 MHz and above).
• See p. 18 for the transceiver and AH-4 connection.
• See the AH-4 instruction manual for AH-4 installa-
tion and antenna connection details.
AH-4 etting example:
For mobile operation
For outdoor operation
Long wire
R DANGER: 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 not grounded.
Transmitting before tuning may damage the trans-
ceiver. Note that the AH-4 cannot tune when using a
½ 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 indicator in the
LCD displays "ANT1(EXT)" when the AH-4 is con-
nected and selected.
• PTT tuner start
Tuning of the internal*/external antenna tuner starts
when [PTT] is pushed on a new frequency (more than
1% from last-tuned frequency). This function removes
the "push and hold [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. 129).
• 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 Set the desired frequency in an HF or 50 MHz
band for use with the AH-4.
• The AH-4 will not operate on frequencies outside
w Push and hold [TUNER] for 1 sec.
Optional AH-2b
• The indicator on the switch blinks while tuning.
antenna element
e The indicator on the switch lights constantly when
tuning is complete.
• When the connected wire cannot be tuned, the
r To bypass the AH-4 manually, push [TUNER].
NOTE: PTT tuner function is also available. See
p. 129 for details.
• 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 tun-
ing is completed, turn the internal tuner ON.
Otherwise, both tuners tune simultaneously and cor-
rect tuning may not be obtained.
See the instruction manual included with each
antenna tuner for their respective operations.

ANTENNA TUNER OPERATION

of ham bands.
TUNER
indicator on the switch goes out and the AH-4 is
bypassed. At that point the antenna wire connec-
tion is to the transceiver directly, and not via the
AH-4 antenna tuner.
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