Specifications

Page 46 FT-950 OPERATING MANUAL
IF NOISE BLANKER
(
NB
)
OPERATION
The FT-950 includes an effective IF Noise Blanker, which can significantly reduce noise caused by automotive ignition
systems.
INTERFERENCE REJECTION
1. Press the
[
NB
]
button momentarily to reduce short
duration pulse noise such as from switching transients,
automobile ignitions and power lines. The “ ” icon
will appear in the display to confirm that the Narrow-
NB is operating. Press and hold in the
[
NB
]
button for
two seconds to reduce longer-duration man-made pulse
noise. The “ ” icon will blink for three seconds,
and thereafter will appear continuously, to confirm that
the Wide-NB is operating.
2. If desired, you may adjust the Noise Blanker level via
Menu item “
067 RGEN NB 1 LVL067 RGEN NB 1 LVL
067 RGEN NB 1 LVL067 RGEN NB 1 LVL
067 RGEN NB 1 LVL” (for short-dura-
tion pulse noise) or “
068 RGEN NB 2 LVL068 RGEN NB 2 LVL
068 RGEN NB 2 LVL068 RGEN NB 2 LVL
068 RGEN NB 2 LVL” (for longer
duration pulse noise) to the point where the offending
noise is best reduced or eliminated. See box below for
details.
3. To end Noise Blanker operation, press the
[
NB
]
but-
ton once more. The “ ” icon will turn off, confirm-
ing that the Noise Blanker is no longer in operation.
ADVICE:
 The Noise Blanker operation will be memorized inde-
pendently on each VFO stack of VFO-A and VFO-B.
However, the Noise Blanker level is in common.
 When the Roofing filter mode is set to “AUTO” and
the Noise Blanker is turned “ON”, the Roofing Filter
bandwidth will automatically be set to “15 kHz”. The
Roofing Filter may be changed to a narrower selec-
tion, as described previously, although Noise Blanker
operation may be compromised somewhat when using
a narrower Roofing Filter.
[
NB
]
Button
Adjusting the Noise Blanker Level
1. Press the
[
MENU
]
button to engage the Menu
mode.
2. Rotate the
[
SELECT
]
knob to select Menu item
“
067 RGEN NB 1 LVL067 RGEN NB 1 LVL
067 RGEN NB 1 LVL067 RGEN NB 1 LVL
067 RGEN NB 1 LVL” (for short-duration pulse
noise) or “
068 RGEN NB 2 LVL068 RGEN NB 2 LVL
068 RGEN NB 2 LVL068 RGEN NB 2 LVL
068 RGEN NB 2 LVL” (for longer-du-
ration pulse noise).
ADVICE:
Press the
[
SELECT
]
knob to toggle the display
between “Menu Number & Menu Group Name”
and “Menu Item”.
3. Rotate the
[
CLAR/VFO-B
]
knob to the point where
the offending noise is best reduced or eliminated.
4. Press and hold in the
[
MENU
]
button for one sec-
ond to lock in the new setting and exit to normal
operation.
[
CLAR/VFO-B
]
Knob
[
MENU
]
Button
[
SELECT
]
Knob