Icom IC-7100 Instruction Manual page 161

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16
ANTENNA TUNER OPERATION
Connecting the antenna tuner
The AH-4 and AT-180
AUTOMATIC ANTENNA TUNER
matches the IC-7100 to the connected antenna auto-
matically.
Once the tuner matches an antenna, the variable ca-
pacitor settings are memorized as a preset point for
each frequency range (100 kHz steps). Therefore, when
you change the frequency range, the variable capaci-
tors are automatically preset to the memorized point.
NOTE: Before connecting, be sure to turn OFF the
transceiver's power.
D
Connecting an AH-4
The optional AH-4 matches the IC-7100 to a long
wire antenna more than 7 m/23 ft long (3.5 MHz and
above).
IC-7200
Ground
To [ANT]
D
Connecting an AT-180
The optional AT-180 matches the IC-7100 to both HF
and 50 MHz antenna, and automatically tunes the an-
tenna (impedance range: 16.7 to 150 ø) during trans-
mission when the antenna SWR is less than 1.5:1.
IC-7100
To [ACC]
Ground
To [ANT]
Coaxial cable supplied
with the AT-180
To [TUNER]
Ground*
ACC cable supplied with the AT-180
To [ANT]
To [TRANSCEIVER]
• See page ??-?? for operation.
• See the AH-4 instruction manual installation and an-
tenna connection details.
AH-4
ANT
* Use as thick and short a wire as possible
between the AH-4 and ground.
• See page ??-?? for operation.
*Either of the two
To [ACC]*
external connectors
AT-180
16-2
To Long wire
Antenna
element
To optional AH-2b
HF/6 m antenna
Coaxial cable
Ground