Yaesu FT-991, Operating Manual

Page: 43 / 96

Page 41 FT-991 O
peraTing
M
anual
o
perAting
M
ode
SSB
CW
RTTY/DATA
AM
FM (28/50/144/430
MHz Bands)
i
nTerferenCe
r
eJeCTion
nArrow
(
nAr
)
o
ne
-t
ouch
iF F
ilter
S
election
Touching [ NAR/WIDE
] displayed by pressing the
F(M-LIST) button provides 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:

: Depends on the [
WIDTH
] setting
( ): Default Bandwidth
“ on ”
200 Hz ~ 1.8 kHz

(1.5 kHz)
50 ~ 500 Hz

(500 Hz)
50 ~ 500 Hz 
(300 Hz)
6 kHz
9 kHz
“ oFF ”
1.8 ~ 3.0 kHz

(2.4 kHz)
500 Hz ~ 3.0 kHz

(2.4 kHz)
500 Hz ~ 2.4 kHz 
(500 Hz)
9 kHz
16 kHz
[
nAr/wide
]
t
ouch
k
ey
A
dvice
:

When the narrow bandwidth is selected, the “
NAR
”
icon will appear in the display.

If [ NAR/WIDE
] on the LCD has been touched to
engage the narrow filter, you may still adjust the nar -
row IF bandwidth with [ WIDTH
] on the LCD and
the MULTI knob. The IF SHIFT is also operational.

When you touch [ NAR/WIDE
] on the LCD in the
FM mode, both transmit and receive bandwidths are
narrowed.
F(M-LIST) Button