Icom IC-7200 Advanced Instructions page 97

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9
ANTENNA TUNER OPERATION
■ About the 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 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
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
• " " blinks while tuning.
is still ON after the tuning is completed.
e
" "
• When the connected wire cannot be tuned, "
goes out, the AH-4 is bypassed and the antenna wire is
directly connected.
Push
r
TUNER
• " " goes out.
Appears when the antenna tuner is ON.
Blinks while tuning.
Optional AH-2b
antenna element
Long wire
for 1 second.
to manually bypass the AH-4.
automatic antenna tuner
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
λ long wire or on a multiple of that frequency.
1 ⁄
2
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
is activated on the first transmission on the new fre-
quency.
Turn ON this function in the Set mode.
"
9-4
" operation and
TUNER