Kenwood TS-990S, Instruction Manual

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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 pass bandwidth 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, LSB-DATA, USB-
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 pass band
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 pass
bandwidth higher and counterclockwise shifts the frequency
pass bandwidth 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
Pass Bandwidth (Hz) Shift Frequency (Hz)
Range Default Range Default
CW
50, 80, 100,
150, 200, 250,
300, 400, 500,
600, 1000, 1500,
2000, 2500
500
-800, -750, -700,
-650, -600, -550,
-500, -450, -400,
-350, -300, -250,
-200,-150,-100,
-50, 0, 50, 100,
150, 200, 250,
300, 350, 400,
450, 500, 550,
600, 650, 700,
750, 800
800
DATA
50 , 80 , 100 ,
150 , 200 , 250 ,
300 , 400 , 500 ,
600 , 1000 , 1500 ,
2000 , 2200 , 2400 ,
2600 , 2800 , 13000
2600
1000 , 1100 , 1200 ,
1300 , 1400 , 1500 ,
1600 , 1700 , 1800 ,
1900 , 2000 , 2100 ,
2210
1500
FSK
250 , 300 , 400,
500 , 1000 ,
1500
500 2210 only
PSK
50 , 80 , 100 ,
150 , 200 , 250 ,
300 , 400 , 500 ,
600 , 1000 , 1500
1500 1500 only
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.