Icom IC-7200

69
9
ANTENNA TUNER OPERATION
■ Optional AH-4 automatic antenna tuner operation
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.
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 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
⁄2λ 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
TUNER
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
TUNER
.
• “ ” indicator goes out.
Appears when the antenna tuner ON.
Blinks while tuning.
CONVENIENT
• 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
TUNER
” op-
eration and activates first transmission on the new
frequency.
This function is turned ON in the set mode.