Page 37
FT-991 O
peraTing
M
anual
iF n
oiSe
b
lAnker
(
nb
)
o
perAtion
The
FT-991
includes an effective IF Noise Blanker, which can significantly reduce noise caused by automotive ignition
systems.
1. Touch [
NB
] displayed by pressing the
F(M-LIST)
button briefly to reduce
short duration pulse noise
such as from switching transients, automobile igni-
tions and power lines. The “
NB ON
” will appear in
the display to confirm that the Narrow-NB is operat
-
ing.
2. Touch [
NB
] on the LCD again to reduce
longer-
duration man-made pulse noise
. The “
NBW ON
”
will appear in the display to confirm that the Wide-
NB is operating.
3. If desired, you may adjust the Noise Blanker level
via Menu item “
024 NB LEVEL
” to the point where
the offending noise is best reduced or eliminated.
See box below for details.
4. To end Noise Blanker operation, touch [
NB
] on the
LCD once more. The “
NB OFF
” will appear in the
display, confirming that the Noise Blanker is no lon
-
ger in operation.
Adjusting the Noise Blanker Level
1. Press the
MENU
button to engage the Menu
mode.
2. Rotate the
MULTI
knob to select Menu item “
024
NB LEVEL
”.
3. Touch [
SELECT
] on the LCD
4. Rotate the
MULTI
knob to the point where the
offending noise is best reduced or eliminated.
5. Touch [
ENTER
] on the LCD, then press the
MENU
button or touch [
BACK
] on the LCD to
lock in the new setting and exit to normal opera-
tion.
i
nTerferenCe
r
eJeCTion
F(M-LIST) Button
MULTI Knob
MENU button
Summary of Contents for FT-991
Page 2: ......
