Installation Of Optional Accessories; (For Wire Antenna); Operation - Yaesu FT-991 Operating Manual

i
nstallation of
Fc-40 e
xternAl
Setup the FT-991
The optional FC-40 Automatic Antenna Tuner provides automatic tuning of a coaxial line to present nominal 50-ohm
impedance to the FT-991's ANT jack.
Before operation can begin, the FT-991 microprocessor must be setup to accommodate the FC-40 automatic tuner. This
is done using the Menu Mode:
1. Press the MENU(SETUP) button to enter the Menu
mode.
2. Rotate the MULTI knob to select the Menu Item "143
TUNER SELECT".
3. Touch [ SELECT ] on the LCD, then rotate the
MULTI knob to select "EXTERNAL".
4. Touch [ ENTER ] on the LCD to save the new setting.
5. Press the MENU(SETUP) button or touch [ BACK ]
on the LCD to exit to normal operation.

Operation

1. Press the TUNE button briefly to activate the
Automatic Antenna Tuner.
2. The "TUNER" icon will appear in the TFT display.
3. Press and hold the TUNE button for one second
to begin automatic tuning. The transmitter will be
engaged, and the "TUNER" icon will blink while
tuning is in progress.
4. Tuning will stop automatically when a low SWR is
achieved. You may Press the TUNE button while
tuning is in progress, to cancel the automatic tuning.
5. To disable the Automatic Antenna Tuner, press the
TUNE button briefly again.
Page 140
o
ptional
A A
utoMAtic ntennA
a
ccessories
(
t
uner For
MENU(SETUP) Button
MULTI Knob
n :
ote
r Be sure to connect a good earth ground to the GND
terminal of the FC-40.
r 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.
r It is normal to hear the sound of the relays while
tuning is in progress.
r If the impedance cannot be matched by the FC-40
better than 2:1, and the "HI-SWR" icon blinks, the
microprocessor will not retain the tuning data for that
frequency, as the FC-40 presumes that you will want
to adjust or repair your antenna system to correct the
high SWR condition.
FT-991 O
)
W A
ire ntennA
TUNE Button
M
peraTing anual