Kenwood TS-990S Operation Manual - Page 154
Manual Notch Filter (ssb, Cw, Fsk, And Psk), The Sub Band, Nb1/sel], Band., Multi/ch, Notch
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6 REJECTING INTERFERENCE ■ Activating or deactivating the Noise Blankers for the sub band 1 Press [NB1/SEL] or [NB2/SEL]. • Noise Blanker 1 or Noise Blanker 2 for the sub band becomes active or inactive. • While Noise Blanker 1 or Noise Blanker 2 is active, "NB1" or "NB2" appears on the upper left side of the main screen. While both Noise Blanker 1 and Noise Blanker 2 are active, "NB1 2" appears on the upper left side of the main screen. • To deactivate Noise Blanker 1 or Noise Blanker 2 for the sub band, press the key again. 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. . 4 ■ Adjusting the Noise Blanker levels for the main band. 1 Rotate the NB1 or NB2 control. • You can adjust the level of NB1 or NB2. • Rotating the NB1 or NB2 control clockwise suppresses noise. ■ 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. . 4 ■ 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. 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. 6-10 /PUDI'SFRVFODZ 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. Index Contents