![background image](http://html.mh-extra.com/html/icom/ic-7200/ic-7200_advanced-instructions_612215097.webp)
9-4
9
ANTENNA TUNER OPERATION
■
About the optional AH-4
automatic
antenna
tuner
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 page 2-4, 2-6 for connection.
• See the AH-4 instruction manual for AH-4 installation and
antenna connection details.
AH-4 setting example:
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 con-
nected. 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
Operating the AH-4
Tuning is required for each frequency.
Be sure to
retune the antenna before transmitting when you
change the frequency—even slightly.
Set a desired frequency in an HF band.
q
• The AH-4 will not operate on frequencies outside of the
ham bands.
Hold down
w
TUNER
for 1 second.
• “
” blinks while tuning.
e
“
”
is still ON after the tuning is completed.
• When the connected wire cannot be tuned, “
”
goes out, the AH-4 is bypassed and the antenna wire is
directly connected.
Push
r
TUNER
to manually bypass the AH-4.
• “
” goes out.
Appears when the antenna tuner is ON.
Blinks while tuning.
CONVENIENT
• PTT tune function (p. 10-11)
The AH-4 always tunes when [PTT] is pushed after
the frequency is changed (more than 1%). This func-
tion replaces the “hold down
TUNER
” operation and
is activated on the first transmission on the new fre-
quency.
Turn ON this function in the Set mode.
Previous view