Operation Manual

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:
Ì Do not touch the cables or connectors with wet hands.
Ì Do not touch the cables or connectors when you transmit. There is danger of electric shock or other serious
injury.
Ì 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