Icom IC-7100

16
ANTENNA TUNER OPERATION
16-2
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Connecting the antenna tuner
To Long wire
To optional AH-2b
Ground
AH-4
To [ANT]
IC-7200
To [TUNER]
Ground*
ANT
Antenna
element
To [TRANSCEIVER]
To [ANT]
To [ACC]
AT-180
To [ANT] To [ACC]*
Ground
HF/6 m antenna
Coaxial cable supplied
with the AT-180
ACC cable supplied with the AT-180
Coaxial cable
Ground
IC-7100
*Either of the two
external connectors
* Use as thick and short a wire as possible
between the AH-4 and ground.
Connecting an AH-4 D
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).
• See page ??-?? for operation.
• See the AH-4 instruction manual installation and an-
tenna connection details.
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.
Connecting an AT-180 D
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.
• See page ??-?? for operation.