Antenna Tuner Operation; Automatic Antenna Tuner; Operation; D Tuner Operation - Icom IC-7000 Instruction Manual

The AT-180 automatic antenna tuner matches the
IC-7000 to the connected antenna automatically. Once
the tuner matches an antenna, the variable capacitor
setting are memorized as a preset point for each
frequency range (100 kHz steps). Therefore, when you
change the frequency range, the variable capacitors
are automatically preset to the memorized point.
:
NOTE
bands. However, operation is different for the HF
and 50 MHz bands.
power must be set over the 10 W. Otherwise,
the AT-180 may not be tuned correctly. (AT-180's
minimum operating input power is 8 W.)
D
Push [TUNER/CALL] to turn the tuner ON. The
antenna is tuned automatically during transmission
when the antenna SWR is higher than 1.5:1.
D
During SSB operation on HF bands at low voice
levels, the AT-180 may not be tuned correctly. In such
cases, manual tuning is helpful.
Hold down [TUNER/CALL] for 2 seconds to start
manual tuning.
indicator blinks; then, the previous mode is selected.
If the tuner cannot reduce the SWR to less than
1.5:1 after 20 seconds of tuning, "
disappears. In this case, check the following:

ANTENNA TUNER OPERATION

AUTOMATIC ANTENNA TUNER

" indication appears.
"
" indicator
CAUTION:
NEVER transmit with the tuner ON
when no antenna is connected. This will damage
both the transceiver and antenna tuner.
The AT-180 cannot be used for the 144/430 MHz
bands. When operating on the 144/430 MHz band,
pushing [TUNER/CALL] selects the call channel
(p. 100).
[TUNER/CALL]
Hold down [TUNER/CALL] for 1 second to tune the
antenna. If " " indicator blinks slowly while
transmitting, hold down [TUNER/CALL] for 1 second
again to retune the antenna.
(HF bands only)
The AT-180 has a through inhibit condition. When
selecting this condition, the tuner can be used at poor
SWR's. In this case, automatic tuning in the HF bands
activates only when exceeding SWR 3:1. Therefore,
manual tuning is necessary each time you change
the frequency. Although termed "through inhibit," the
tuner will be set to the "through" configuration if the
SWR is higher than 3:1 after tuning.
CONVENIENT
If you require critical tuning at any time during
transmission, select the tuner sensitive condition.
See page 131 for selection.
(HF bands only)
If you want to turn OFF the tuner under conditions
of VSWR 1.5:1 or less, use "automatic tuner on" and
turn the tuner OFF. See page 130 for turning the
function ON or OFF.
10
(HF bands only)
9
10
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