Kenwood TS-990S - Manual (Page 148)

6 REJECTING INTERFERENCE
6-10
Index Contents
■ Adjusting the Noise Blanker levels for the sub
band.
1 Press and hold [NB1/SEL] or [NB2/SEL].
The Noise Blanker 1 (Sub) screen or Noise Blanker 2
(Sub) screen appears.
Note:
◆ If the transceiver receives the CW signal while Noise Blanker 2 is
active, the received audio may be distorted.
2 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH
control to adjust the level.
• You can adjust the level of Noise Blanker 1 or Noise
Blanker 2.
• The available range is "1" to "10". The default is "6".
Noise is suppressed more effectively if a larger value is
configured.
3 Press [ESC] to exit.
Pressing and holding [NB1/SEL] or [NB2/SEL] closes the
Noise Blanker 1 (Sub) screen or Noise Blanker 2 (Sub)
screen.
MANUAL NOTCH FILTER (SSB, CW,
FSK, and PSK)
The manual notch filter is an IF-stage notch filter that
suppresses beat interference.
You can use the manual notch filter to eliminate beat noise
and catch weak signals or operate the transceiver while
checking the status of noise.
[NOTCH] (S)
[NCH/SEL] (M) [NCH/SEL] (S)
[NOTCH] (M)
■ Activating or deactivating the Manual Notch filter
1 Press [NCH/SEL] (M) or [NCH/SEL] (S) to enable the
manual notch filter for the selected band.
• The "NCH/SEL" (M) LED or "NCH/SEL" (S) LED lights
green. In the main screen, "NOTCH" appears on the upper
left side of the frequency display for the selected band.
• The letter "Y" appears to indicate the notch frequency if the
filter type is displayed in the sub screen.
• Press the key again to deactivate the manual notch filter for
the selected band.
Notch Frequency
2 Rotate the NOTCH (M) or NOTCH (S) control.
Adjust the notch frequency to the point where the beat or
interference is suppressed. The letter "Y" indicating the notch
frequency moves left and right if the filter type appears on the
sub-screen.
Note:
◆ The manual notch filter is deactivated if the auto notch filter or band
elimination filter is active.
◆ The notch point against an interfering beat cannot be changed
even if a pitch and shift is changed after the notch point is
determined in CW mode.