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46
10 REJECTING INTERFERENCE
DSP FILTERS
KENWOOD digital signal processing (DSP)
technology is adapted to this transceiver. Using DSP
filtering (AF), you can control the bandwidth, cancel
the multiple jamming beat, and reduce the noise level
using DSP filtering technology.
CHANGING THE DSP FILTER BANDWIDTH
For improving interference reduction capability, this
transceiver also provides the DSP filtering (AF) along
with IF filters. 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 DSP
filter bandwidth (AF) does not affect the current
reception frequency.
SSB/ FM/ AM
1 Press [MODE] to select SSB, FM, or AM mode.
2 Press [FIL/ NAR].
The current high-cut filter frequency for the
mode appears on the sub-display.
3 Turn the MULTI control clockwise to raise the
high cut-off frequency, or counterclockwise to
lower the high cut-off frequency.
MULTI
IF
SHIFT
MULTI
IF
SHIFT
f
f
4 Press [FIL/ NAR] again.
The current low-cut filter frequency appears.
5 Turn the MULTI control clockwise to raise the
low cut-off frequency, or counterclockwise to
lower the low cut-off frequency.
6 To return to the normal operation, press
[FIL/ NAR] or [MTR/ CLR].
MULTI
IF
SHIFT
MULTI
IF
SHIFT
f
f
tsujdA edoM )zH(snoitceleSycneuqerF
IH
/BSS
MF
,0061,0041,0021,0001
,0042,0022,0002,0081
0043,0003,0082,0062
0005,0004,)tluafed(
MA
,0004,)tluafed(0003,0052
0005
OL
/BSS
MF
,002,)tluafed(001,05,0
,007,006,005,004,003
0001,009,008
MA005,002,)tluafed(001,0
Note:
The cut-off frequencies (LO) 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 DSP filter for data communication (Menu No. 45) is
ON, you cannot change the DSP filter bandwidth. Select
“oFF” to adjust the DSP filter bandwidth.
CW/ FSK
1 Press [MODE] to select CW or FSK mode.
2 Press [FIL/ NAR].
The current DSP filter bandwidth (AF)
appears.
3 Turn the MULTI control clockwise to increase
(wider) the bandwidth, or counterclockwise to
decrease (narrower) the bandwidth.
Interfering
signal
Desired
signal
Interfering
signal
Pass band (AF)
edoM )zH(snoitceleShtdiwdnaB
tluafeD
)zH(
WC
,004,003,002,051,001,08,05
0002,0001,006,005
006
KSF0051,0001,005,0520051
4 As for CW, you can further adjust the RX pitch
frequency. Access Menu No. 34 and turn the
MULTI control to adjust the RX pitch frequency
from 400 to 1000 Hz in steps of 50 Hz. The
default RX pitch frequency is 800 Hz {page 29}.
5 To return to the current operating mode, press
[MTR/ CLR] or [FIL/ NAR].
54


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