Kenwood TS-890S Operation Manual - Page 93

. . .. REJECTING INTERFERENCE 6 NB2 NB2 is a function for blanking pulse noise with a long pulse width which cannot be blanked by NB1. NB2 is further divided into Type A and Type B, which can be employed according to the circumstances. NB2 can also be used together with NB1. Type A Pulse Noise Target Signal Type A suppresses mainly the pulse noise without blanking the target signal. The level of the effect (Level) can be adjusted. Type A ● As pulse noise remains after blanking when "Type A" is used, pulse noise might be audible when the target signal is strong or when there is strong interference within the passband. Even in such a situation, it has the effect of bringing up the target signal when AGC gain is low due to pulse noise. ● "Type A" is most effective in cases where weak target signals are buried in strong pulse noise. Type B Pulse Noise Target Signal Type B As with NB1, Type B blanks the pulse noise together with target signal. The pulse sensitivity level (Level), blanking duration (Width) and attenuation level (Depth) can be adjusted. When pulse noise with a long pulse width is blanked using "Type B", the time interval for which the target signal is removed becomes longer due to the long blanking time, and this causes the silence period to stand out. 1 Press and hold [NB2] to display the Noise Blanker 2 configuration screen. 2 Press F6 [TYPE]. Pressing F6 [TYPE] each time toggles the screen between "Type A" and "Type B". Type A Screen Type B Screen Configuring the NB2 Effect Level (Type A)/ NB2 Pulse Sensitivity Level (Type B) 1 Press and hold [NB2] to display the Noise Blanker 2 configuration screen. 2 While the Type B screen is displayed, press F2 [ ]/ F3 [ ] to select "Level". 3 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to change the level. Setting Value 1 to 6 (default) to 10 (1 step) • Type A: Configuring to a larger value reduces the noise further. • Type B: Configuring to a larger value blanks pulse noises with small level difference from the RX signal. 4 Press and hold [NB2] or press [ESC] to end the process. ● Configuring to a value with a higher level of noise blanker effect may cause the transceiver to malfunction and distort the RX audio depending on the condition of the RX signal or interfering signal. Configuring the Blanking Duration (Type B Only) 1 Press and hold [NB2] to display the Noise Blanker 2 configuration screen. 2 While the Type A screen is displayed, press F6 [TYPE] to switch to Type B. 3 Press F2 [ ]/ F3 [ ] to select "Width". 4 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to change the blanking duration. Setting Value 1 to 10 (default) to 20 (1 step) • Configuring to a larger value lengthens the blanking time. 5 Press and hold [NB2] or press [ESC] to end the process. Configuring the NB2 Attenuation Level (Type B Only) 1 Press and hold [NB2] to display the Noise Blanker 2 configuration screen. 2 While the Type A screen is displayed, press F6 [TYPE] to switch to Type B. 3 Press F2 [ ]/ F3 [ ] to select "Depth". 4 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to change the attenuation level. Setting Value 1 to 20 (default) (1 step) • Configuring to a larger value increases the attenuation level. 5 Press and hold [NB2] or press [ESC] to end the process. 3 Press and hold [NB2] or press [ESC] to end the process. ● Pressing and holding [NB2] displays the noise blanker 2 screen which shows the current type in use. ● The default setting is "Type A". ● Type selection can be configured separately for audio mode (SSB/AM (including DATA mode)) and non-audio mode (CW/FSK/PSK). 6-7