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

■ Optional AT-180
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
• The AT-180 can match both HF and 50 MHz
bands. However, operation is different for the HF
and 50 MHz bands.
• When connecting the AT-180, the IC-7000's output
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 Tuner operation

• For the HF band:
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.
• When the tuner is ON, "

D Manual tuning

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.
• CW mode is selected, a side tone is emitted, and "
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:
• the antenna connection and feedline
• the antenna SWR (p. 36; meter function)

ANTENNA TUNER OPERATION

automatic antenna tuner
" indication appears.
"
" indicator
operation
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]
• For the 50 MHz band:
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.
Through inhibit (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
• Tuner sensitive condition (HF bands only)
If you require critical tuning at any time during
transmission, select the tuner sensitive condition.
See page 131 for selection.
• Automatic tuner start (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.
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