Kenwood TS-990S Operation Manual - Page 155
Auto Notch Filter (ssb), Nch/sel], Notch, Multi/ch
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REJECTING INTERFERENCE 6 ■ Changing the bandwidth of the manual notch filter Configure Wide or Normal for the stopband width of the manual notch filter. If Wide is configured for the bandwidth, the stopband width of the manual notch filter will be expanded twice as wide as Normal. 1 Press [NCH/SEL] (M) or [NCH/SEL] (S) to enable the manual notch filter for the selected band. The manual notch filter for the selected band will be alternated between enabled and disabled. 2 Press and hold [NCH/SEL] (M) or [NCH/SEL] (S) . • "Normal" or "Wide" is configured for the passband width. • If "Wide" is selected, "NOTCH W" will appear above the frequency display of the selected band, in the main screen. AUTO NOTCH FILTER (SSB) If there is a single interfering tone (i.e., a cyclic signal like CW) in the receive bandwidth, the auto notch filter searches for, finds, and suppresses the interfering tone automatically. This function occasionally slightly suppresses the S-meter readout or the target signal. If there is a weak interference signal, beat cancellation may be able to eliminate it more effectively. *OUFSGFSJOH8BWF Note: ◆◆The auto notch filter is deactivated if the manual notch filter or band elimination filter is active while the auto notch filter is active. ■ Adjusting the tracking speed of the Auto Notch Adjust the speed of the notch filter to follow the interference according to the changing status of the interfering signal. 1 Press and hold [A.NCH/SEL] (M) to open the Auto Notch screen. 5BSHFU4JHOBM 4 ■ Activating the auto notch filter 1 Press [A.NCH/SEL] (M) or [A.NCH/SEL] (S) to enable the auto notch filter for the selected band. • The "A.NCH/SEL" (M) or "A.NCH/SEL" (S) LED lights green. • In the main screen, "A.NOTCH" will appear above the frequency display of the selected band. • The auto notch filter for the selected band is deactivated when the corresponding key is pressed again. 2 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH control to select the level for each frequency band. Available range is "0" (disable the tracking) and from "1" (slow) to "4" (fast). The default is "2". 3 Press [ESC] to exit. Pressing and holding [A.NCH/SEL] (M) or [A.NCH/SEL] (S) closes the Auto Notch screen. Contents Index 6-11
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