Kenwood TS-990S Operation Manual - Page 151

Changing The Passband Width And Shift To Adjust Passband Characteristics

Page 151 highlights

REJECTING INTERFERENCE 6 CHANGING THE PASSBAND WIDTH AND SHIFT TO ADJUST PASSBAND CHARACTERISTICS For use in CW or SSB-DATA mode, you can change the passband width of the DSP filter and its amount of shift from the center frequency. For use in RTTY (FSK) or PSK mode, you can change the passband width. You can change the passband width so that interference will be outside the bandwidth of the filter. 5BSHFU4JHOBM *OUFSGFSJOH4JHOBM *OUFSGFSJOH4JHOBM  .  .

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REJECTING INTERFERENCE 6
6-7
Index
Contents
CHANGING THE PASSBAND WIDTH AND SHIFT
TO ADJUST PASSBAND CHARACTERISTICS
For use in CW or SSB-DATA mode, you can change the
passband width of the DSP filter and its amount of shift
from the center frequency. For use in RTTY (FSK) or
PSK mode, you can change the passband width. You can
change the passband width so that interference will be
outside the bandwidth of the filter.
Interfering Signal
Interfering Signal
Target Signal
[ESC]
[FIL/SEL] (M)
Mode keys
[HI/SHIFT]
[FIL/SEL] (S)
[LO/WIDTH]
1
Press a mode key to select CW, USB-DATA, LSB-
DATA, FSK, or PSK mode.
2
Press and hold
[FIL/SEL]
(M) or
[FIL/SEL]
(S) to open
the
RX Filter
screen.
The selected band and the mode name while receiving
appear, and the selected RX filter (A, B, or C) can be edited.
3
Rotate the
LO/WIDTH
control to change the passband
width.
Rotating the control clockwise increases the passband width
and counterclockwise decreases the passband width.
4
Rotate the
HI/SHIFT
control.
Rotating the control clockwise shifts the frequency passband
width higher and counterclockwise shifts the frequency
passband width lower. The frequency range for use in FSK
and PSK mode cannot be adjusted.
5
Press
[ESC]
to exit.
Pressing
[FIL/SEL]
(M) or
[FIL/SEL]
(S) closes the
RX Filter
screen.
Mode
Passband Width (Hz)
Shift Frequency (Hz)
Setting Value
Setting Value
Step
SSB/
SSB-DATA
50/ 80/ 100/ 150/ 200/ 250/
300/ 350/ 400/ 450/ 500/
600/ 700/ 800/ 900/
1000/ 1100/ 1200/ 1300/
1400/ 1500/ 1600/ 1700/
1800/ 1900/ 2000/ 2100/
2200/ 2300/ 2400/ 2500/
2600 (default) / 2700/
2800/ 2900/ 3000
50 to 1500 (default)
to 2500
50
CW
50/ 80/ 100/ 150/ 200/ 250/
300/ 350/ 400/ 450/ 500
(default)/ 600/ 700/ 800/
900/ 1000/ 1500/ 2000/
2500
-800 to 0 (default) to
+800
10
FSK
250/ 300/ 350/ 400/ 450/
500 (default)/ 1000/ 1500
PSK
50/ 80/ 100/ 150/ 200/ 250/
300/ 350/ 400/ 450/ 500
(default)/ 600/ 700/ 800/
900/ 1000/ 1200/ 1400/
1500/ 1600/ 1800/ 2000/
2200/ 2400/ 2600/ 2800/
3000
ACTIVATING AUDIO PEAK FILTER FOR USE IN
CW MODE
If the readability of a signal is affected by noise or any
other interference while receiving in CW mode, passing
the receive signal through a bandwidth centered on the
CW pitch frequency improves its readability.
[CW/CW-R]
[APF/SEL] (S)
[APF/SEL] (M)
1
Press
[CW/CW-R]
to select CW mode.
2
Press
[APF/SEL]
(M) or
[APF/SEL]
(S).
Each time you press either one of the keys, the audio peak
filter for the selected band toggles between active and
inactive. While the audio peak filter is active, the "APF/SEL"
(M) or "APF/SEL" (S) LED lights green.
The audio peak filter for the selected band is disabled by a
press of the same key.