Cw/ Fsk Modes; Beat Cancel; Noise Reduction; Changing Nr1 Performance - Kenwood TS-570D, TS-570S Instruction Manual

9 REJECTING INTERFERENCE

CW/ FSK Modes

1
1 Select CW or FSK mode.
2 Press [FILTER].
• The current filter selection appears.
2
3 Turn the MULTI/CH control clockwise to widen
the bandwidth, or counterclockwise to narrow the
bandwidth.
3
4
5
Interfering
signal
4 Press [FILTER] to complete the setting.
6
M o e d B a d n
5 , 0 8 , 0
C W
7
4 0 , 0 5
F S K 2 5 , 0 5
Depending on which bandwidth you select for the
DSP filter and which type of optional filter you install,
8
the wide IF filter or the narrow IF filter will
automatically be selected.
O p i t n o l a
M
9
F t l i r e
C
Y K 8 - 8 S N 1 -
S S B
10
1 ( 8 . k H ) z
F
C
11
Y K 8 - 8 C 1 -
C W
5 ( 0 0 H ) z
F
12
Y K 8 - 8 C N 1 -
C W C
2 ( 7 0 H ) z

BEAT CANCEL

13
Beat Cancel uses an adaptive filter and attenuates more
than one cyclic interference within the receive pass
band. The adaptive filter changes its characteristics
14
according to the nature of the signal being received at a
given moment. You can use Beat Cancel when in SSB,
FM, or AM mode.
15
Receive pass band
Interfering
tones
16
Before
38
Desired Interfering
signal
signal
w d i h t S e e l t c o i s n H ( ) z
1 0 , 0 1 5 , 0 2 0 , 0 3 0 , 0
0 , 0 6 0 , 0 1 0 . , k 2 0 . k
0 , 0 1 0 . , k 1 5 . k
o e d D S P F t l i r e B a d n w d i h t
2 0 . k H z
W
1 0 . k H z r o o l w r e
1 5 . k H z
S K
2 5 0 H , z 5 0 0 H , z
1 0 . k H z
1 0 . k H , z 2 0 . k H z
W
6 0 0 H z r o o l w r e
1 0 . k H , z 1 5 . k H z
S K
2 5 0 H , z 5 0 0 H z
3 0 0 H z r o h g i h r e
W
5 0 H , z 1 0 0 H , z
2 0 0 H z
Desired
signal
After
Press [B.C.] to toggle Beat Cancel ON or OFF.
• "BEAT CANCEL" appears when the function is ON.
Note: While receiving intermittent CW signals, the transceiver
sounds clicks. This does not indicate a malfunction.
If attenuation is not satisfactory, press [B.C.] for
1 second or longer to enhance the attenuation effect; a
beep sounds, but no change occurs on the display.
Pressing [B.C.] for 1 second or longer again restores
the original attenuation level.
Note:
The Enhanced Beat Cancel setting is cleared when the power to
the transceiver is turned OFF.
Enhanced Beat Cancel may adversely affect desired signals
slightly because of its stronger effect.

NOISE REDUCTION

This transceiver provides two types of Noise Reduction
D f e u a t l
functions, 1 and 2, for reducing random noise which
H ( ) z
interferes with the desired signal. Just trying them both
is the easiest way to judge which function works more
6 0 0
effectively under the current condition. Normally select
Noise Reduction 1 in SSB mode and select Noise
1 5 . k
Reduction 2 in CW mode.
Note: Using Noise Reduction 2 in SSB mode may lower the clarity
of signals or induce pulse noise depending on conditions.
Press [N.R.] to toggle between Noise Reduction 1,
Noise Reduction 2, and OFF.
F I F t l i r e
• "N. R. 1" or "N.R. 2" appears depending on which
B a d n w d i h t
function is selected.
W d i e
N r a o r w
W d i e
N r a o r w
W d i e
Note: A different selection can be made between two groups of
modes; one group includes SSB, FM, and AM, and the other group
N r a o r w
includes CW and FSK. So you need not change the selection each
time you switch modes between the two groups.
W d i e

Changing NR1 Performance

N r a o r w
W d i e
Use Menu No. 51 to change the effect of Noise
Reduction 1. Switch Noise Reduction 1 ON, then
N r a o r w
select level 1 to 9 in this menu while receiving
signals. The default is "Auto"; this selection provides
an optimum effect according to the strength of the
received signal.
Note:
Using a high NR1 level and Beat Cancel simultaneously may
cause noise to stand out; this does not indicate a malfunction.
When changing the NR1 level in the menu, you will hear
sound momentarily caused by an internal operation change;
this does not indicate a malfunction.

Setting NR2 Time Constant

You can change the correlation time for Noise
Reduction 2. When in SSB, select the correlation
time that allows you to hear signals with more clarity.
When receiving CW, it is best to select the longest
correlation time that allows reliable reception. The
longer the correlation time, the better S/N.
Access Menu No. 12 and select 7.5 ms or 20 ms.
The default is 20 ms.