Nb2; Configuring The Nb2 Effect Level (Type A)/ Nb2 Pulse Sensitivity Level (Type B); Configuring The Blanking Duration (Type B Only); Configuring The Nb2 Attenuation Level (Type B Only) - Kenwood TS-890S Instruction Manual

NB2

NB2 is a function for blanking pulse noise with a long pulse width
which cannot be blanked by NB1. NB2 is further divided into Type
A and Type B, which can be employed according to the
circumstances. NB2 can also be used together with NB1.
Type A
Pulse Noise
Target Signal
Type A
.
As pulse noise remains after blanking when "Type A" is
●
used, pulse noise might be audible when the target
signal is strong or when there is strong interference
within the passband. Even in such a situation, it has the
effect of bringing up the target signal when AGC gain is
low due to pulse noise.
"Type A" is most effective in cases where weak target
●
signals are buried in strong pulse noise.
Type B
Pulse Noise
Target Signal
Type B
.
When pulse noise with a long pulse width is blanked using
"Type B", the time interval for which the target signal is
removed becomes longer due to the long blanking time,
and this causes the silence period to stand out.
1 Press and hold [NB2] to display the Noise Blanker
2 configuration screen.
2 Press F6 [TYPE].
Pressing F6 [TYPE] each time toggles the screen between
"Type A" and "Type B".
Type A Screen
.
Type B Screen
.
3 Press and hold [NB2] or press [ESC] to end the
process.
Pressing and holding [NB2] displays the noise blanker
●
2 screen which shows the current type in use.
The default setting is "Type A".
●
Type selection can be configured separately for audio
●
mode (SSB/AM (including DATA mode)) and non-audio
mode (CW/FSK/PSK).
Type A suppresses mainly the pulse noise
without blanking the target signal. The level
of the effect (Level) can be adjusted.
As with NB1, Type B blanks the pulse noise
together with target signal. The pulse
sensitivity level (Level), blanking duration
(Width) and attenuation level (Depth) can
be adjusted.
REJECTING INTERFERENCE 6
Configuring the NB2 Effect Level (Type A)/ NB2 Pulse
Sensitivity Level (Type B)
1 Press and hold [NB2] to display the Noise Blanker
2 configuration screen.
2 While the Type B screen is displayed, press F2
[ ]/ F3 [ ] to select "Level".
3 Press F4 [–]/ F5 [+] or turn the [MULTI/CH] control
to change the level.
Setting Value 1 to 6 (default) to 10 (1 step)
• Type A: Configuring to a larger value reduces the noise further.
• Type B: Configuring to a larger value blanks pulse noises
with small level difference from the RX signal.
4 Press and hold [NB2] or press [ESC] to end the
process.
Configuring to a value with a higher level of noise blanker
●
effect may cause the transceiver to malfunction and
distort the RX audio depending on the condition of the
RX signal or interfering signal.

Configuring the Blanking Duration (Type B Only)

1 Press and hold [NB2] to display the Noise Blanker
2 configuration screen.
2 While the Type A screen is displayed, press F6
[TYPE] to switch to Type B.
3 Press F2 [ ]/ F3 [
4 Press F4 [–]/ F5 [+] or turn the [MULTI/CH] control
to change the blanking duration.
Setting Value 1 to 10 (default) to 20 (1 step)
• Configuring to a larger value lengthens the blanking time.
5 Press and hold [NB2] or press [ESC] to end the
process.

Configuring the NB2 Attenuation Level (Type B Only)

1 Press and hold [NB2] to display the Noise Blanker
2 configuration screen.
2 While the Type A screen is displayed, press F6
[TYPE] to switch to Type B.
3 Press F2 [
]/ F3 [
4 Press F4 [–]/ F5 [+] or turn the [MULTI/CH] control
to change the attenuation level.
Setting Value 1 to 20 (default) (1 step)
• Configuring to a larger value increases the attenuation level.
5 Press and hold [NB2] or press [ESC] to end the
process.
] to select "Width".
] to select "Depth".
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