Vertex Standard FT-2000 ユーザーズマニュアル
Page 61
FT-2000 O
PERATING
M
ANUAL
IF N
OISE
B
LANKER
(NB) O
PERATION
The FT-2000 includes an effective IF Noise Blanker, which can significantly reduce noise caused by automotive ignition
systems.
systems.
Main band (VFO-A) NB Operation
1. Press the [NB] button momentarily to reduce short-
duration pulse noise such as from switching transients,
automobile ignitions and power lines. The “
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 “
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 five seconds, and
thereafter will appear continuously, to confirm that the
Wide-NB is operating.
Wide-NB is operating.
2. Advance the [NB] knob to the point where the offend-
ing noise is best reduced or eliminated.
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.
A
DVICE
:
When the Roofing filter mode is set to “AUTO” and
the Noise Blanker is turned On, the Roofing Filter band-
width will automatically be set to 15 kHz. The Roof-
ing Filter may be changed to a narrower selection, as
described previously, although Noise Blanker opera-
tion may be compromised somewhat when using a nar-
rower Roofing Filter.
width will automatically be set to 15 kHz. The Roof-
ing Filter may be changed to a narrower selection, as
described previously, although Noise Blanker opera-
tion may be compromised somewhat when using a nar-
rower Roofing Filter.
When you change the Noise Blanker level on the Main
(VFO-A) side, the Sub (VFO-B) band’s Noise Blanker
level will automatically change to be the same as that
for VFO-A, if the Sub (VFO-B) band’s Noise Blanker
is engaged.
level will automatically change to be the same as that
for VFO-A, if the Sub (VFO-B) band’s Noise Blanker
is engaged.
Main Band (VFO-A) “NB” Icon
[B] Button
Sub Band (VFO-B) “NB” Icon
[NB] Button
I
NTERFERENCE
R
EJECTION (S
IGNALS
WITHIN
3
KHZ
)
[NB] Knob
Sub band (VFO-B) NB Operation
1. Press the [B] button.
2. Within five seconds of pressing the [B] button (while
2. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press the [NB]
button momentarily to reduce short-duration pulse
noise such as from switching transients, automobile ig-
nitions and power lines. The “
button momentarily to reduce short-duration pulse
noise such as from switching transients, automobile ig-
nitions and power lines. The “
” icon will appear in
the display to confirm that the Narrow-NB is operat-
ing.
ing.
3. Within five seconds of pressing the [B] button (while
the imbedded orange LED is blinking), press and hold
in the [NB] button for two seconds to reduce longer-
duration man-made pulse noise. The “
in the [NB] button for two seconds to reduce longer-
duration man-made pulse noise. The “
” icon will
blink for five seconds, then appear continuously, to con-
firm that the Wide-NB is operating.
firm that the Wide-NB is operating.
4. To end Noise Blanker operation, press the [B] button,
then press the [NB] button. The “
” icon will turn
off, confirming that the Noise Blanker is no longer in
operation.
operation.
A
DVICE
:
When you change the Noise Blanker level on the Sub
(VFO-B) side, the Main (VFO-A) band’s Noise Blanker
level will automatically change to be the same as that for
VFO-B, if the Main (VFO-A) band’s Noise Blanker is
engaged.
(VFO-B) side, the Main (VFO-A) band’s Noise Blanker
level will automatically change to be the same as that for
VFO-B, if the Main (VFO-A) band’s Noise Blanker is
engaged.