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Page 94 FT-450 OPERATION MANUAL
I
NSTALLATION
OF
O
PTIONAL
A
CCESSORIES
ACTIVE-TUNING ANTENNA SYSTEM
(
ATAS-100/-120/120A
)
OPERATION
The optional ATAS-100, ATAS-120, or ATAS-120A Active-Tuning Antenna System permits operation on a num-
ber of HF bands (7/14/21/28 MHz) plus 50 MHz.
The FT-450 provides microprocessor control of the tuning mechanism in the ATAS antenna for convenient
automatic tuning.
Interconnections to FT-450
“ATAS-120A” is connected referring to the figure below.
ADVICE:
Always turn off the power switch on the FT-450 and the external power supply before you connect any cables.
ATTENTION:
Do not touch the cables or connectors with wet hands.
Do not touch the cables or connectors when you transmit. There is danger of electric shock or other serious
injury.
It is not possible to use an ATU-450 or the FC-30 with an ATAS-120A at the same time.
Installation
Before operation can begin, you must instruct the FT-450’s microprocessor that the ATAS-100/-120/-120A is
being used. This is done using the Menu Mode:
1. Press and hold the
[
F
]
button for one second to
enter the Menu Mode.
The “ ” icon will appear in the display.
2. Rotate the
[
DSP/SEL
]
knob to select the Menu
Item “TUNER”.
3. Press the
[
DSP/SEL
]
knob to enable this selected
Menu Item.
4. Rotate the
[
DSP/SEL
]
knob to change the setting
to “ATAS”.
5. Press and hold the
[
F
]
button for one second to
return to normal operation.
Operation
AUTOMATIC TUNING
1. Press the
[
TUNE
]
button briefly to activate the
Automatic Antenna Tuner.
The “ ” icon will appear in the display.
If the transceiver frequency is out of the amateur
band, the “ ” icon will not appear.
If the antenna SWR is High (more than 1:2.0), the
” icon will blink.
2. Press and hold the
[
TUNE
]
button for one second
to begin automatic tuning. The transmitter will be
engaged, and the “ ” icon will blink while tun-
ing is in progress.
3. Tuning will stop automatically when a low SWR is
achieved. You may Press and hold the
[
TUNE
]
button for one second while tuning is in progress,
to cancel the automatic tuning.
[
DSP/SEL
]
Knob
[
F
]
button
[
TUNE
]
button
96


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