ICOM IC-7000 说明手册

D

115

10

ANTENNA TUNER OPERATION

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 band.

• The AH-4 will not operate on frequencies outside of

ham bands.

w Push and hold 

for 1 sec.

• “

” indicator and “CW” appears while tuning.

e “

” indicator stays ON when tuning is com-

plete.

• When the connected wire cannot be tuned, “

” in-

dicator blinks, and the AH-4 is bypassed and the an-
tenna wire is connected to the antenna connector on
the transceiver directly.

r To  bypass the AH-4 manually, push 

.

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 

”

operation and activates first transmission on the new
frequency. This function is turned ON in the miscella-
neous (others) set mode (p. 131).

■

The AH-4 matches the IC-7000 to a long wire antenna
more than 7 m/23 ft long (3.5 MHz and above).

• See p. 20 for connection.
• See the AH-4 instruction manual for AH-4 installation and

antenna connection details.

operate the AH-4 without an antenna wire.

The tuner and transceiver will be damaged.

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

λ long wire or on a multiple of that frequency.

[TUNER/CALL]

R

touch the antenna element while tuning or

transmitting.

For mobile operation    

For outdoor operation    

Long wire

Optional AH-2b
antenna element

Push 

for 1 sec. 

M

M

S

S

G

G

Push 

momentarily. 

S

S

--

1

1

S

S

--

2

2

S

S

--

3

3

Either

Y

 or 

Z

Either

Y

 or 

Z