ICOM IC-7000 用户手册
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ANTENNA TUNER OPERATION
The AT-180 automatic antenna tuner matches the IC-
7000 to the connected antenna automatically. Once the
tuner matches an antenna, the variable capacitor angles
are memorized as a preset point for each frequency
range (100 kHz steps). Therefore, when you change the
frequency range, the variable capacitors are automati-
cally preset to the memorized point.
7000 to the connected antenna automatically. Once the
tuner matches an antenna, the variable capacitor angles
are memorized as a preset point for each frequency
range (100 kHz steps). Therefore, when you change the
frequency range, the variable capacitors are automati-
cally 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.
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 min-
imum operating input power is 8 W.)
AT-180 may not be tuned correctly. (AT-180’s min-
imum operating input power is 8 W.)
[TUNER/CALL]
The AT-180 cannot be used for the 144/430 MHz
bands. When operating on the 144/430 MHz band,
pushing
bands. When operating on the 144/430 MHz band,
pushing
[TUNER/CALL] selects the call channel
(p. 102).
CAUTION:
NEVER transmit with the tuner ON
when no antenna is connected. This will damage
both the transceiver and antenna tuner.
both the transceiver and antenna tuner.
■Optional AT-180
AUTOMATIC ANTENNA TUNER
operation
DTuner operation
• For the HF band:
Push
Push
[TUNER/CALL] to turn the tuner ON. The an-
tenna is tuned automatically during transmission
when the antenna SWR is higher than 1.5:1.
when the antenna SWR is higher than 1.5:1.
• When the tuner is ON, “
” indication appears.
• For the 50 MHz band:
Push
Push
[TUNER/CALL] for 1 sec. to tune the antenna.
If “
” indicator blinks slowly while transmitting,
push and hold
[TUNER/CALL] for 1 sec. again to re-
tune the antenna.
DManual tuning
During SSB operation on HF bands at low voice lev-
els, the AT-180 may not be tuned correctly. In such
cases, manual tuning is helpful.
els, the AT-180 may not be tuned correctly. In such
cases, manual tuning is helpful.
Push
[TUNER/CALL] for 2 sec. to start manual tun-
ing.
• 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 sec. of tuning, “
after 20 sec. of tuning, “
” indicator disappears.
In this case, check the following:
• the antenna connection and feedline
• the antenna SWR (p. 36; meter function)
• the antenna connection and feedline
• the antenna SWR (p. 36; meter function)
Through inhibit (HF bands only)
The AT-180 has a through inhibit condition. When se-
lecting 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 “through” if the SWR is higher than 3:1 after
tuning.
The AT-180 has a through inhibit condition. When se-
lecting 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 “through” if the SWR is higher than 3:1 after
tuning.
• Tuner sensitive condition (HF bands only)
If you require critical tuning at any time during trans-
mission, select the tuner sensitive condition. See
p. 133 for selection.
If you require critical tuning at any time during trans-
mission, select the tuner sensitive condition. See
p. 133 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 p. 132 for turning the function
ON and OFF.
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 p. 132 for turning the function
ON and OFF.
CONVENIENT
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