JVC KENWOOD Corporation 31201110 用户手册
56
Press [FUNC], [B.C./ MANUAL], then turn the
MANUAL BC control to select the single Beat
Cancel frequency manually. You can select the
beat cancel frequency from approx. 230 Hz to
3300 Hz by turning the control. Turn the control
clockwise to select a higher frequency and
counterclockwise to select a lower frequency.
MANUAL BC control to select the single Beat
Cancel frequency manually. You can select the
beat cancel frequency from approx. 230 Hz to
3300 Hz by turning the control. Turn the control
clockwise to select a higher frequency and
counterclockwise to select a lower frequency.
•
Since the DSP Automatic Beat Cancel processes
the incoming signals at the AF stage, strong beat
signals may affect the AGC level. In this case,
use the Auto Notch Filter instead, to remove the
beat signal from the IF passband filter.
the incoming signals at the AF stage, strong beat
signals may affect the AGC level. In this case,
use the Auto Notch Filter instead, to remove the
beat signal from the IF passband filter.
Note: While receiving intermittent CW signals, the transceiver
clicks. This is not a malfunction.
clicks. This is not a malfunction.
NOISE REDUCTION
(N.R.1: ALL MODES, N.R.2: SSB/ CW/ FSK/ AM)
(N.R.1: ALL MODES, N.R.2: SSB/ CW/ FSK/ AM)
This transceiver provides two types of Noise
Reduction functions (1 and 2) for reducing random
noise which interferes with the desired signal. Trying
them both is the easiest way to judge which function
works more effectively under the current conditions.
Normally, select Noise Reduction 1 (Line Enchanced)
in SSB mode and Noise Reduction 2 (SPAC) in CW
mode.
Reduction functions (1 and 2) for reducing random
noise which interferes with the desired signal. Trying
them both is the easiest way to judge which function
works more effectively under the current conditions.
Normally, select Noise Reduction 1 (Line Enchanced)
in SSB mode and Noise Reduction 2 (SPAC) in CW
mode.
Press [N.R./ LEVEL] to toggle between Noise
Reduction 1, Noise Reduction 2, and OFF.
Reduction 1, Noise Reduction 2, and OFF.
•
“N. R. 1” or “N.R. 2” appears, depending on which
function is selected.
function is selected.
■
Setting the N.R. 1 Level Adjustment
The Noise Reduction 1 (Line Enchanced Method)
uses an adaptive filter to reduce the noise element
from the received signals. When the S/N ratio is
reasonably goo in SSB, using N.R.1 will improve
the S/N further.
uses an adaptive filter to reduce the noise element
from the received signals. When the S/N ratio is
reasonably goo in SSB, using N.R.1 will improve
the S/N further.
While the N.R. 1 is ON, you can further adjust the
noise reduction level by pressing [FUNC],
[N.R./ LEVEL], then turn MULTI/ CH control to
select the level from 1 to 10 or AUTO. The default
is AUTO.
noise reduction level by pressing [FUNC],
[N.R./ LEVEL], then turn MULTI/ CH control to
select the level from 1 to 10 or AUTO. The default
is AUTO.
■
Setting the N.R. 2 Time Constant
You can change the correlation time for Noise
Reduction 2 (SPAC). When in SSB mode, 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 the S/N ratio.
Reduction 2 (SPAC). When in SSB mode, 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 the S/N ratio.
When Noise Reduction 2 is ON, press [FUNC],
[N.R./ LEVEL], then turn the MULTI/ CH control to
select the correlation time from 2 ms to 20 ms.
The default is 20 ms.
[N.R./ LEVEL], then turn the MULTI/ CH control to
select the correlation time from 2 ms to 20 ms.
The default is 20 ms.
Note:
◆
Using Noise Reduction 2 in SSB mode may lower the clarity
of signals or induce pulse noise, depending on the
conditions.
of signals or induce pulse noise, depending on the
conditions.
◆
Only N.R. 1 is available for the sub-receiver. However, the
level cannot be adjusted.
level cannot be adjusted.
9 REJECTING INTERFERENCE
NOTCH FILTER (SSB)
Auto Notch filter automatically locates and attenuates
any single interfering tone within the receive pass
band. This function operates digitally at the IF filter
level, hence it can affect your S-meter reading and
may also affect (slightly attenuate) your desired
signal. However, controlling the AGC level by
notching out the strong interfering beat signals could
bring up the desired SSB signal that is covered by the
interfering beat signal. If the interfering tone is weak,
you may find that Beat Cancel eliminates them more
effectively.
any single interfering tone within the receive pass
band. This function operates digitally at the IF filter
level, hence it can affect your S-meter reading and
may also affect (slightly attenuate) your desired
signal. However, controlling the AGC level by
notching out the strong interfering beat signals could
bring up the desired SSB signal that is covered by the
interfering beat signal. If the interfering tone is weak,
you may find that Beat Cancel eliminates them more
effectively.
Press [A.N./ LEVEL] to toggle the Auto Notch Filter
ON and OFF.
ON and OFF.
•
“A.N.” appears when the function is ON.
•
The interfering beat signals are notched out.
If the interfering beat signals change the tone
frequency randomly, you can adjust the Auto Notch
level.
frequency randomly, you can adjust the Auto Notch
level.
Press [FUNC], [A.N./ LEVEL] to access the Auto
Notch level adjustment, then turn the MULTI/ CH
control to select the level from 0 to 5. Level 1 is the
slowest beat tone tracking speed and Level 5 is the
fastest. Level 0 terminates the beat tone tracking.
Notch level adjustment, then turn the MULTI/ CH
control to select the level from 0 to 5. Level 1 is the
slowest beat tone tracking speed and Level 5 is the
fastest. Level 0 terminates the beat tone tracking.
BEAT CANCEL (SSB/ AM)
Beat Cancel uses an adaptive filter and attenuates
more than one cyclic interference within the receive
pass band. The adaptive filter changes its
characteristics according to the nature of the signal
being received at any given moment. You can use
automatic Beat Cancel when in SSB or AM mode.
more than one cyclic interference within the receive
pass band. The adaptive filter changes its
characteristics according to the nature of the signal
being received at any given moment. You can use
automatic Beat Cancel when in SSB or AM mode.
Press [B.C./ MANUAL] to toggle the Auto Beat
Cancel ON and OFF.
Cancel ON and OFF.
•
“B. C.” appears when the function is ON.
•
If desired, you can manually control the beat
cancel frequency.
cancel frequency.
Before
Interfering
tones
tones
After
Receive pass band
Desired
signal
signal
Before
Interfering
tones
tones
After
Receive pass band
Desired
signal
signal