Kenwood TS-2000 Operation Manual - Page 65

Rejecting Interface, DSP FILTERS

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REJECTING INTERFERENCE DSP FILTERS KENWOOD digital signal processing (DSP) technology is used for the functions described in this section. Using DSP filtering, the TS-2000 frees you from installing many analog filters for each operating mode. Additionally, you can control the bandwidth, cancel the multiple jamming beat, and reduce the noise level using DSP filtering technology. CHANGING THE RECEIVE FILTER BANDWIDTH For improving interference reduction capability, this transceiver also provides IF filters designed using DSP technology. When in SSB, FM, or AM mode, you can change the filter bandwidth by altering its low and/or high cut-off frequency. For CW and FSK modes, you can change the filter bandwidth by directly specifying a bandwidth. Changing the filter bandwidth does not affect the current receive frequency. Note: ◆ The receive filter bandwidth can be changed only on the main transceiver. ◆ The IF DSP filter is not available in FM mode. ■ SSB/ FM/ AM Modes 1 Select SSB, FM, or AM mode. 2 Press [DISP]. • The current filter selection appears. 3 Turn the LO/ WIDTH control clockwise to raise the low cut-off frequency, or counterclockwise to lower the low cut-off frequency. LO/ WIDTH f f Turn the HI/ SHIFT control clockwise to raise the high cut-off frequency, or counterclockwise to lower the high cut-off frequency. HI/ SHIFT f Adjust LO/ WIDTH HI/ SHIFT f Frequency Selections (Hz) 0, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3400, 4000, 5000 Mode SSB/ FM AM Default low-cut Default high-cut frequecy (Hz) frequency (Hz) 300 2600 100 5000 4 To return the display to the current operating mode, press [DISP]. Note: ◆ The cut-off frequencies can be adjusted independently for each operating mode. When you change the operating mode, the previous setting is recalled for each operating mode. ◆ When the Packet filter (Menu No. 50A) is ON, you cannot change the DSP filter bandwidth. Switch the Packet filter OFF to adjust the DSP filter bandwidth. ■ CW/ FSK Modes 1 Press [CW/ FSK/ REV] to select CW or FSK mode. 2 Press [DISP]. • The current filter selection appears. 3 Turn the LO/ WIDTH control clockwise to increase (wide) the bandwidth, or counterclockwise to decrease (narrow) the bandwidth. Interfering signal Desired Interfering signal signal Mode Bandwidth Selections (Hz) Default (Hz) CW 50, 80, 100, 150, 200, 300, 400, 500, 600, 1000, 2000 600 FSK 250, 500, 1000, 1500 1500 4 As for CW, you can further adjust the shift frequency for passband. Turn the HI/ SHIFT control to adjust the shift frequency from 400 to 1000 Hz in steps of 50 Hz. The default shift frequency is 800 Hz. 5 To return the display to the current operating mode, press [DISP]. 55

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55
REJECTING INTERFERENCE
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To return the display to the current operating
mode, press
[DISP]
.
Note:
◆
The cut-off frequencies can be adjusted independently for
each operating mode.
When you change the operating
mode, the previous setting is recalled for each operating
mode.
◆
When the Packet filter (Menu No. 50A) is ON, you cannot
change the DSP filter bandwidth.
Switch the Packet filter
OFF to adjust the DSP filter bandwidth.
■
CW/ FSK Modes
1
Press
[CW/ FSK/ REV]
to select CW or FSK
mode.
2
Press
[DISP]
.
•
The current filter selection appears.
3
Turn the
LO/ WIDTH
control clockwise to
increase (wide) the bandwidth, or
counterclockwise to decrease (narrow) the
bandwidth.
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As for CW, you can further adjust the shift
frequency for passband.
Turn the
HI/ SHIFT
control to adjust the shift frequency from 400 to
1000 Hz in steps of 50 Hz.
The default shift
frequency is 800 Hz.
5
To return the display to the current operating
mode, press
[DISP]
.
DSP FILTERS
KENWOOD
digital signal processing (DSP)
technology is used for the functions described in this
section.
Using DSP filtering, the TS-2000 frees you
from installing many analog filters for each operating
mode.
Additionally, you can control the bandwidth,
cancel the multiple jamming beat, and reduce the
noise level using DSP filtering technology.
CHANGING THE RECEIVE FILTER BANDWIDTH
For improving interference reduction capability, this
transceiver also provides IF filters designed using
DSP technology.
When in SSB, FM, or AM mode,
you can change the filter bandwidth by altering its low
and/or high cut-off frequency.
For CW and FSK
modes, you can change the filter bandwidth by
directly specifying a bandwidth.
Changing the filter
bandwidth does not affect the current receive
frequency.
Note:
◆
The receive filter bandwidth can be changed only on the main
transceiver.
◆
The IF DSP filter is not available in FM mode.
■
SSB/ FM/ AM Modes
1
Select SSB, FM, or AM mode.
2
Press
[DISP]
.
•
The current filter selection appears.
3
Turn the
LO/ WIDTH
control clockwise to raise
the low cut-off frequency, or counterclockwise
to lower the low cut-off frequency.
LO/ WIDTH
f
f
Turn the
HI/ SHIFT
control clockwise to raise
the high cut-off frequency, or counterclockwise
to lower the high cut-off frequency.
HI/ SHIFT
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Interfering
signal
Desired
signal
Interfering
signal