Справочник Пользователя для ICOM ic-756pro3

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10

ANTENNA TUNER OPERATION

■

The AH-4 matches the IC-756PROIII to a long wire
antenna more than 7 m/23 ft long 

(3.5 MHz and above)

.

The AH-3 matches the IC-756PROIII to a long wire
antenna more than 3 m/10 ft long 

(3.5 MHz and above)

or more than 12 m/40 ft long 

(1.8 MHz and above)

.

• See p. 18 for the transceiver and AH-4/AH-3 connection.
• See the AH-4/AH-3 instruction manual for AH-4/AH-3 in-

stallation and antenna connection details.

R

touch the antenna element while tuning

or transmitting.

operate the AH-4/AH-3 without an antenna

wire. The tuner and transceiver will be damaged.

operate the AH-4/AH-3 when it is not

grounded.

Transmitting before tuning may damage the trans-
ceiver. Note that the AH-4/AH-3 cannot tune when
using a 

1

⁄

2

λ long wire or multiple of the operating fre-

quency.

• When connecting the AH-4/AH-3, the antenna

connector assignments are 

for the inter-

nal tuner and 

for the AH-4/AH-3. The an-

tenna indicator in the LCD displays “ANT1(EXT)”
when the AH-4/AH-3 is connected and selected.

• The AH-3 can be used for HF bands only. It can-

not be used for the 50 MHz band.

Tuning is required for each frequency. 

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. Set the desired fre-
quency in an HF band for use with the AH-3.

• The AH-4/AH-3 will not operate on frequencies outside

of ham bands.

w Push 

for 1 sec.

• The 

light blinks while tuning.

e The 

light lights constantly when tuning is

complete.

• When the connected wire cannot be tuned, the

light goes out and the AH-4/AH-3 is by-

passed. At that point the antenna wire connection is to
the transceiver directly, and not via the AH-4/AH-3 an-
tenna tuner.

r To  bypass the AH-4/AH-3 manually, push

.

[TUNER]

For mobile operation

For outdoor operation

Long wire

IC-756PROIII

Optional AH-2b
antenna element

When using an external antenna tuner such as the
IC-PW1’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 an-
tenna tuner for their respective operations.