40
9 REJECTING INTERFERENCE
■
CW/ FSK Mode (Width/Shift)
1
Select CW or FSK mode.
2
Turn
the
LO
/
WIDTH
control clockwise
to increase the bandwidth (wide), or
counterclockwise to decrease the bandwidth
(narrow).
Before
Interfering
signal
Interfering
signal
After
Desired signal
Mode
Bandwidth Selection (Hz)
Default
CW
50, 80, 100, 150, 200, 250,
300, 400, 500, 600, 1000,
1500, 2000, 2500
500 Hz
FSK
250, 500, 1000, 1500
500 Hz
3
As for CW, you can further adjust the shift
frequency for the pass band. Turn the
HI
/
SHIFT
control clockwise to increase the
shift frequency (high), or counterclockwise to
decrease the shift frequency (low).
Shift Frequency (Hz)
Default
300, 350, 400, 450, 500, 550, 600,
650, 700, 750, 800, 850, 900, 950,
1000
800 Hz
■
SSB Data Mode (Width/Shift)
1
Select Data mode (USB-DATA/LSB-DATA).
2
Turn
the
LO
/
WIDTH
control clockwise
to increase the bandwidth (wide), or
counterclockwise to decrease the bandwidth
(narrow).
Bandwidth Selection (Hz)
Default
50, 80, 100, 150, 200, 250, 300, 400,
500, 600, 1000, 1500, 2000, 2500
2500 Hz
3
Turn
the
HI
/
SHIFT
control clockwise to increase
the shift frequency (high), or counterclockwise
to decrease the shift frequency (low).
Shift Frequency (Hz)
Default
1000, 1100, 1200, 1300, 1400, 1500,
1600, 1700, 1750, 1800, 1900, 2000,
2100, 2210
1500 Hz
■
IF Filter A and B
This transceiver has 2 built-in IF fi lters: A and
B. The IF Filter settings are stored with the last
settings of the
LO/WIDTH
and
HI/SHIFT
controls.
Press [IF FIL] to toggle between IF Filter setting A
and B (each VFO A and VFO B).
• “
” appears when IF fi lter setting A is selected
and “
” appears when IF fi lter setting B is
selected.
DSP FILTERS
KENWOOD
digital signal processing (DSP)
technology is adapted to this transceiver. Using DSP
fi ltering (AF), you can control the bandwidth, cancel
the multiple jamming beat, and reduce the noise level.
CHANGING THE DSP FILTER BANDWIDTH
For improving interference reduction capability, this
transceiver also provides IF fi lters designed using
DSP technology. To change the passband of the fi lter,
you can use the method of changing the high and
low cut-off frequency (HI/LOW cut), or you can use
the method of changing the bandwidth and center
frequency (WIDTH/SHIFT). Changing the IF fi lter
does not affect the current receive frequency.
• The meter display changes, based on the
bandwidth you are setting up.
■
SSB/ FM/ AM Mode (High cut/Low cut)
1
Select SSB, FM, or AM mode.
2
Turn
the
LO
/
WIDTH
control clockwise to raise
the low cut-off frequency, or counterclockwise to
lower the low cut-off frequency.
Mode
Low cut Frequency (Hz)
Default
SSB/
FM
0, 50, 100, 200, 300, 400,
500, 600, 700, 800, 900, 1000
300 Hz
AM
0, 100, 200, 300
100 Hz
Turn
the
HI
/
SHIFT
control clockwise to raise the
high cut-off frequency, or counterclockwise to
lower the high cut-off frequency.
Mode
High cut Frequency (Hz)
Default
SSB/
FM
1000, 1200, 1400, 1600,
1800, 2000, 2200, 2400,
2600, 2800, 3000, 3400,
4000, 5000
2600 Hz
AM
2500, 3000, 4000, 5000
5000 Hz
Low cut-off frequency
Interfering
signal
Interfering
signal
Desired signal
High cut-off frequency
0 Hz 1 KHz
5 KHz
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.