Yaesu FT-991 Operating Manual page 54

i
nterference
nArroW ( nAr ) o
Press the F(M-LIST) button to display the function menu list. Touch the [ NAR/WIDE ] button to enable one-touch,
mode-specific, selection of a narrow IF DSP filter setting that does not require resetting the bandwidth control to the
WIDTH/SHIFT system.
Touching [ NAR/WIDE ] on the LCD once more returns
the bandwidth control to the WIDTH/SHIFT system.
The factory default bandwidths are:
o M
perAting ode
SSB 200 Hz - 1.8 kHz
( 1.5 kHz )
CW 50 - 500 Hz
( 500 Hz )
RTTY/DATA-LSB/ 50 - 500 Hz
( 300 Hz )
DATA-USB
AM
FM/DATA-FM
( 28/50/144/430
MHz Bands )
 : Depends on the [ WIDTH ] setting
A :
dvice
 If [ NAR/WIDE ] on the LCD has been touched to
engage the narrow filter, you may further adjust the
narrow IF bandwidth by touching [ WIDTH ] on the
TFT display and rotating the MULTI knob. The IF
SHIFT may also be operated.
 When in the FM mode, touching [ NAR/WIDE ] on
the TFT display will narrow both transmit and re-
ceive bandwidths.
Page 52
r
eJection
ne
[ nAr/Wide ] t
k
ouch ey
"on" "oFF"
 
1.8 - 3.0 kHz
( 2.4 kHz )
 500 Hz - 3.0 kHz
( 2.4 kHz )
 500 Hz - 3.0 kHz
( 500 Hz )
6 kHz 9 kHz
9 kHz 16 kHz
( ) : Default Bandwidth
-t iF F
ouch ilter


S
election
F(M-LIST) Button
FT-991 O
peraTing
M
anual