Kenwood TS-990S Operation Manual - Page 157
NOISE REDUCTION, Elimination Filter, BEF/SEL], MULTI/CH, NR1/SEL]
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REJECTING INTERFERENCE 6 ■ Changing the attenuation level 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 [ ] (F3) to allow editing of "Depth" (attenuation level). 3 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH control to select the amount of attenuation. • You can select the attenuation level of the band elimination filter. • Available range is "20" Hz to "80" dB (in steps of 20 dB). • The default is "40". 4 Press [ESC] to exit. Pressing and holding [BEF/SEL] (M) or [BEF/SEL] (S) closes the Band Elimination Filter screen. NOISE REDUCTION The transceiver incorporates two types of noise reduction, i.e., Noise Reduction 1 (NR1) and Noise Reduction 2 (NR2). With Noise Reduction 1 selected, spectrum subtraction noise reduction filter that attaches importance to readability is activated while the transceiver is receiving an audio signal in SSB, FM, or AM mode. While the transceiver is receiving an audio signal in CW, FSK, or PSK mode, a LSM type noise reduction that emphasizes the periodic signal is activated instead. This is suitable for communication in CW mode because the SPAC system can function during reception to extract periodic signals using the Noise Reduction 2. Note: ◆◆When Noise Reduction 1 in SSB, FM, or AM mode is suppressing beat signals, wanted signals may also be slightly suppressed. This is a normal action of Noise Reduction 1, and not a failure. ◆◆If Noise Reduction 2 is active while the transceiver is in SSB mode, the readability of the wanted signal may drop or pulse noise or distortion may occur. ◆◆Noise Reduction 2 cannot be used for FM mode. . . . . ■ Activating the Noise Reduction for the main band 1 Press [NR1] or [NR2]. • Noise Reduction 1 or Noise Reduction 2 for the main band is activated or deactivated. • While Noise Reduction 1 or Noise Reduction 2 is active, "NR1" or "NR2" appears on the upper left side of the main screen. • Press the key again to deactivate the noise reduction for the main band. ■ Activating the Noise Reduction for the sub band 1 Press [NR1/SEL] or [NR2/SEL]. • Noise Reduction 1 or Noise Reduction 2 for the sub band becomes active or inactive. While Noise Reduction 1 or Noise Reduction 2 is active, "NR1" or "NR2" appears on the upper left side of the main screen. • Pressing the key again deactivates the noise reduction for sub band. Note: ◆◆Noise Reduction 1 and Noise Reduction 2 cannot both be enabled at the same time for both main band and sub band. Contents Index 6-13