INTERFERENCE REJECTION(SIGNALS WITHIN 3KHZ)

IF NOISE BLANKER (NB) OPERATION

The FT-2000includes an effective IF Noise Blanker, which can significantly reduce noise caused by automotive ignition

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 “” 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 five seconds, and thereafter will appear continuously, to confirm that the 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.

ADVICE:

￿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.

￿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.

Main Band (VFO-A) “NB” Icon

[NB] Button

Sub Band (VFO-B) “NB” Icon

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[B] Button

[NB] Knob

Sub band (VFO-B) NB Operation

1.Press the [B] button.

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 “” icon will appear in the display to confirm that the Narrow-NB is operat- 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 “” icon will blink for five seconds, then appear continuously, to con- 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.

ADVICE:

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.

FT-2000 OPERATING MANUAL

Page 61