Yaesu FT-450 Operation Manual page 93

I
NSTALLATION OF
A
UTOMATIC
Operation
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.
2. Press and hold the [ TUNE ] button for one second
to begin automatic tuning. The transmitter will be
engaged, and the "
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.
4. To disable the Automatic Antenna Tuner, press
the [ TUNE ] button briefly again.
Interconnections to FT-450
Ì Always switch the transceiver off before connecting any cables to the FC-30.
Ì If the FC-30 doesn't tune even though you have pushed the TUNER switch of FT-450, it may be because the
antenna or its coaxial cable have a serious problem (very high or low impedance due to an "open" or "short"
circuit condition). Please check the antenna and coax if this happens.
Ì Do not place any objects next to the ventilation ducts on the FC-30, especially those in the front.
Note
Ì The FC-30 and the ATAS-120A Active Tuning Antenna System cannot be operated at the same time.
Ì The carrier signal transmits continuously while tuning is in progress. Please monitor the operating frequency
before beginning the tuning process. Be sure you are not interfering with others who may already be using
the frequency.
Ì It is normal to hear the sound of the relays while tuning is in progress.
Ì If the FC-30 does not tune (the "
the amateur band, it may be because the antenna or its coaxial cable have a serious problem (very high or
low impedance due to an "Open" or "short" circuit condition. Please check the antenna and coaxial cable if
this happens.
Ì The FC-30 only adjusts the impedance presented to the transceiver at the station end of your coaxial cable
feed line. It does not "tune" the SWR at the antenna feed point itself. When designing and building your
antenna system, we recommended that every effort be made to ensure a low SWR at the antenna feed point.
Ì Do not connect an antenna or feed cable that is not designed for 50-ohm impedance.
Ì The impedance matching range of the FC-30 is from 16.5 ohms to 150 ohms (up to 3:1 SWR). Accordingly,
the FC-30 should not be expected to match "long wire" type antennas unless you have taken specific design
steps to ensure that the impedance presented to the FT-450 is within this specification.
FT-450 O
A
NTENNA
" icon will blink while tun-
" icon will blink) even though you have pressed the [TUNE] switch within
M
O
PTIONAL
T FC-30 O
UNER
A
CCESSORIES
PERATION
[ TUNE ] button
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