Kenwood TS-890S Operation Manual - Page 95

Beat Canceler, DSP Monitor

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REJECTING INTERFERENCE 6 Configuring the NR1 Effect Level Beat Canceler 1 Press [NR] to select Noise Reduction 1. 2 Press and hold [NR] to display the Noise Reduction 1 effect level configuration screen. Beat canceler is capable of suppressing multiple periodic interfering signals (beats) within the RX bandwidth through digital processing at the AF level. This function can be used in the SSB, AM and FM modes. . .. 3 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to change the level of effect. Setting Value 1 to 5 (default) to 10 (1 step) • For NR1, configuring to a larger value reduces the noise further. However, as the impact on the RX audio also gets stronger if the effect level is excessively high, adjust it to an appropriate level. 4 Press and hold [NR] or press [ESC] to end the process. Turning ON/OFF Beat Canceler Press [BC]. Pressing [BC] each time switches the beat canceler mode in the following sequence: "Beat Canceler 1" → "Beat Canceler 2" → "OFF". • When beat canceler 1 or beat canceler 2 is ON, > or > is displayed on the screen. • Beat canceler 1 suppresses weak beats and continuous beats. Beat canceler 2 suppresses intermittent beats such as CW signals. Configuring the NR2 Correlation Time 1 Press [NR] to select Noise Reduction 2. 2 Press and hold [NR] to display the NR2 Time Constant configuration screen. ● Although the beat canceler suppresses the overall auditory beat, the gain of the target signal cannot be recovered using the AGC function. Thus, if the beat signal is larger than the target signal, using a notch filter activates the AGC function to enhance the clarity of the target signal. DSP Monitor 3 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to change the correlation time. Setting Value 2 to 20 (default) [ms] (2-step) • As the optimal correlation time varies with the RX signal and noise type when NR2 is used, configure the correlation time while receiving the signals. 4 Press and hold [NR] or press [ESC] to end the process. ● NR2 adjusts the correlation time for periodic signal extraction. It is different from NR1, which adjusts the effect level. DSP monitor is a function for temporarily expanding the passband width of the IF filter and AF filter via DSP in order to monitor the signal condition of nearby frequencies such as when receiving a specific frequency using a filter with a narrow passband width during contesting. Assigning DSP Monitor to PF Key Register "DSP MONITOR" in Menu [0-15] "PF A: Key Assignment" to Menu [0-31] "Microphone UP: Key Assignment" Expanding the Passband Width Using DSP Monitor Press and hold down the PF key that is assigned with the DSP monitor function. The passband width of the filter is expanded while the key is held down. ● During DSP monitoring, the audio peak filter is forcibly turned OFF. 6-9

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Configuring the NR1 Effect Level
1
Press [NR] to select Noise Reduction 1.
2
Press and hold [NR] to display the Noise Reduction
1 effect level configuration screen.
3
Press F4 [–]/ F5 [+] or turn the [MULTI/CH] control
to change the level of effect.
Setting Value
1 to 5 (default) to 10 (1 step)
•
For NR1, configuring to a larger value reduces the noise
further. However, as the impact on the RX audio also gets
stronger if the effect level is excessively high, adjust it to an
appropriate level.
4
Press and hold [NR] or press [ESC] to end the
process.
Configuring the NR2 Correlation Time
1
Press [NR] to select Noise Reduction 2.
2
Press and hold [NR] to display the NR2 Time
Constant configuration screen.
3
Press F4 [–]/ F5 [+] or turn the [MULTI/CH] control
to change the correlation time.
Setting Value
2 to 20 (default) [ms] (2-step)
•
As the optimal correlation time varies with the RX signal and
noise type when NR2 is used, configure the correlation time
while receiving the signals.
4
Press and hold [NR] or press [ESC] to end the
process.
●
NR2 adjusts the correlation time for periodic signal
extraction. It is different from NR1, which adjusts the
effect level.
Beat Canceler
Beat canceler is capable of suppressing multiple periodic
interfering signals (beats) within the RX bandwidth through digital
processing at the AF level.
This function can be used in the SSB, AM and FM modes.
Turning ON/OFF Beat Canceler
Press [BC].
Pressing
[BC]
each time switches the beat canceler mode in
the following sequence: “Beat Canceler 1” → “Beat Canceler 2”
→ “OFF”.
•
When beat canceler 1 or beat canceler 2 is ON, <<
BC
1
>>
or <<
BC
2
>> is displayed on the screen.
•
Beat canceler 1 suppresses weak beats and continuous
beats. Beat canceler 2 suppresses intermittent beats such
as CW signals.
●
Although the beat canceler suppresses the overall
auditory beat, the gain of the target signal cannot be
recovered using the AGC function. Thus, if the beat
signal is larger than the target signal, using a notch filter
activates the AGC function to enhance the clarity of the
target signal.
DSP Monitor
DSP monitor is a function for temporarily expanding the passband
width of the IF filter and AF filter via DSP in order to monitor the
signal condition of nearby frequencies such as when receiving a
specific frequency using a filter with a narrow passband width
during contesting.
Assigning DSP Monitor to PF Key
Register “DSP MONITOR” in Menu [0-15]
“
PF A: Key
Assignment
”
to Menu [0-31]
“
Microphone UP: Key
Assignment
”
Expanding the Passband Width Using DSP Monitor
Press and hold down the PF key that is assigned
with the DSP monitor function.
The passband width of the filter is expanded while the key is
held down.
●
During DSP monitoring, the audio peak filter is forcibly
turned OFF.
REJECTING INTERFERENCE
6
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