Kenwood TS-990S Operation Manual - Page 156
Band Elimination Filter, Filter., Bef/sel], Notch, Multi/ch
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6 REJECTING INTERFERENCE BAND ELIMINATION FILTER Band Elimination Filter is the notch filter that can change the bandwidth and attenuation at the IF stage. The stopband width can be selected from the available range of 300 Hz to 1200 Hz (in steps of 100 Hz) and the amount of attenuation can be selected from the available range of 20 dB to 80 dB (in steps of 20 dB). If there are two or more interfering signals, you can adjust the stopband width and attenuation level according to the strength of the interfering signals, thus making the target signal clear. *OUFSGFSJOH4JHOBM 8JEUI 5BSHFU4JHOBM "UUFOVBUJPO . 4 2 Rotate the NOTCH (M) or NOTCH (S) control to adjust the notch filter frequency. You can 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 band elimination filter is deactivated if the manual 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. 4 ■ Changing the stopband width of the Band Elimination Filter 1 Press and hold [BEF/SEL] (M) or [BEF/SEL] (S) to open the Band Elimination Filter screen for the selected band. 2 Press [ ] (F2) or [ for the bandwidth. ] (F3) to select "Wide" ■ Activating or deactivating the Band Elimination Filter. 1 Press [BEF/SEL] (M) or [BEF/SEL] (S) to enable the band elimination filter for the selected band. • The "BEF/SEL" (M) LED or "BEF/SEL" (S) LED lights green. In the main screen, "BEF" will appear above the frequency display of 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 disable the band elimination filter for the selected band. 3 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH control to select the stopband width. • You can select the stopband width of the band elimination filter. • Available range is "300" Hz to "1200" Hz (in steps of 100 Hz). • The default is "400". 4 Press [ESC] to exit. Pressing and holding [BEF/SEL] (M) or [BEF/SEL] (S) closes the Band Elimination Filter screen. 6-12 Index Contents
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