ICOM 301500 Manuale Utente

69

9

ANTENNA TUNER OPERATION

N Optional AH-4 

The AH-4 matches the IC-7200 to a long wire antenna 
more than 7 m/23 ft long (3.5 MHz and above).

• See p. 14 for connection.
•  See the AH-4 instruction manual for AH-4 installation and 

antenna connection details.

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.

NEVER operate the AH-4 without an antenna wire. 
The tuner and transceiver will be damaged.

NEVER 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.

D 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 band.

 • 

 

The AH-4 will not operate on frequencies outside of 
ham bands.

w Push and hold 

 for 1 sec.

 • 

“

” indicator blinks while tuning.

e  

“

”

 indicator is still ON after the tuning is 

completed.

 • 

 

When the connected wire cannot be tuned, “

” 

indicator goes out, and the AH-4 is bypassed and the 
antenna wire is connected to the antenna connector 
on the transceiver directly.

r To bypass the AH-4 manually, push 

.

 • 

“

” indicator goes out.

Appears when the antenna tuner ON.
Blinks while tuning.

• PTT tune function (p. 76)
The AH-4 is always tuned when [PTT] is pushed 
after the frequency is changed (more than 1%). This 
function removes the “push and hold 

 

” op-

eration and activates first transmission on the new 
frequency.
This function is turned ON in the set mode.