Yaesu FT-991A - Page 25

Page 23F
T-991



This large knob adjusts the operating frequency of
VFO-A.
Rotate clockwise to increase the operating frequency
and rotate counter-clockwise to decrease the operat-
ing frequency.
  



















 







Numbers in parentheses indicate steps when the  button is On.

The tuning steps for the Main Dial knob are set
at the factory to: 10Hz
(
SSB/AM
)
, 5 Hz
(
CW/
RTTY/DATA-LSB/DATA-USB
)
and 100 Hz
(
FM/
DATA-FM/C4FM
)
per step.
In LSB, USB, CW, RTTY, DATA-LSB or DATA-
USB mode, the frequency change amount
(
step
width
)
may be toggled between “
5Hz
” and “
10Hz
”
by pressing the
F



button, and then touch-
ing [

] on the LCD.
 Button
Pressing this button will change the tuning of the
Main Tuning Dial knob
(
VFO-A
)
to a higher step
rate.
Press this button to double the main dial frequency
variation. “
” in the LED indicator area will light
up.
Press this button again to restore the frequency varia-
tion to the original value. “
” will disappear.
 Button
This button toggles on/o locking of the Main Tun-
ing Dial knob.
Press this button to lock the main dial operations.
“ ” will light up in the LED indicator area.
Press this button again to unlock the main dial opera-
tions. “ ” will disappear.
 Button
During reception, press this button, then rotate the

knob to adjust the VFO-A
RX clarier oset value
(
see page 36
)
.
m
The clarier oset value
(
frequency
)
can be re-
stored to “0
(
zero
)
” by pressing the

button
for more than 1 second.
m
Depending on the menu mode “
040 CLAR
MODE SELECT
” setting, this button can work as
the TX clarifier for changing only the transmit
frequency
(
see page 75
)
or RX/TX clarifier for
both receiving and transmitting
(
see page 36,
75
)
.
 Button
This button toggles frequency control between VFO-
A and the memory system.
m
Pressing this button alternately recalls the VFO
frequency data and the frequency data saved in a
memory channel by turns.
A

 Button
Pressing and holding this key for one second
(
until
the double beep
)
copies the current operating data
into the currently selected memory channel, over-
writing any previous data stored there.
Press this button briey to display the memory check
function screen, where the data saved in a memory
channel may be reviewed.
m
While displaying memory data, rotate the

knob to review the data in each memory channel.
Press this button again, to close the memory list
screen.
 Button
Press this button to operate split frequency between
VFO-A
(
used for reception
)
and VFO-B
(
used for
transmission
) (
see page 76
)
.
m
Press and hold in the

button for one sec-
ond to engage the “Quick Split”
(
see page 76
)
feature. VFO-B transmit will automatically be
set to a frequency 5 kHz higher than the VFO-A
receive frequency, with the same operating mode.
The transceiver will operate in the Split mode.
 Knob
During the VFO-A operation, rotate this knob to ad-
just the clarier.
During Split operation, this knob adjusts the operat-
ing frequency of VFO-B.
 Knob
Adjust the receiver gain of the high frequency and
mid-range frequency amplier stages.
m
Rotate the knob clockwise to increase the gain.
Rotate the knob fully clockwise to set the gain to
the highest level for normal operations.
 Knob
The

knob sets the receiver audio volume
level.
m
Rotate the knob clockwise to increase the receiv-
er audio volume level.