Bedienungsanleitung Kenwood TS-2000E (Seite 64 von 150) (Englisch)

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12 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.

Before

Interfering

tones

After

Receive pass band

Desired

signal

Press [A.N./ LEVEL] to toggle the Auto Notch Filter

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.

Press [FUNC], [A.N./ LEVEL] to access the Auto

Notch level adjustment, then turn the MULTI/ CH

control to select the level from FIX, and 1 to 4.

Level 1 is the slowest beat tone tracking speed and

Level 4 is the fastest. FIX terminates the beat tone

tracking. Adjust this pamameter manually to remove

the beat signal if necessary.

AUTO BEAT CANCEL (SSB/ AM)

Auto 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.

Before

Interfering

tones

After

Receive pass band

Desired

signal

Press [B.C./ MANUAL] to toggle between the Auto

Beat Cancel ON and OFF.

• “B. C.” appears when the function is ON.

• If desired, you can manually control the beat

cancel frequency.

MANUAL BEAT CANCEL (ALL MODES)

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. 300Hz to 3000 Hz by turning

the control. Turn the control clockwise to select a

higher frequency and counterclockwise to select a

lower frequency.

Since the DSP Beat Cancel processes the incoming

signals at the AF stage, strong beat signals may

control the AGC, then weaken the target signal level.

In this case, use the Auto Notch Filter instead, to

remove the beat signal from the IF passband filter.

Note: While adjusting the MANUAL BC control, the transceiver

clicks. This is not a malfunction.

NOISE REDUCTION

(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 Enhanced) 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.

•“ ” or “ ” appears, depending on which

function is selected.

■ Setting the N.R. 1 Level Adjustment

The Noise Reduction 1 (Line Enhanced Method)

uses an adaptive filter to reduce the noise element

from the received signals. When the S/N ratio is

reasonably good in SSB, using N.R. 1 will improve

the S/N further.

While N.R. 1 is ON, you can further adjust the noise

reduction level by pressing [FUNC], [N.R./ LEVEL],

then turn the MULTI/ CH control to select the level

from 1 to 9 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.

When N.R. 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.

Note:

◆

Using Noise Reduction 2 in SSB mode may lower the clarity of

signals or induce pulse noise, depending on the conditions.

◆

Only Noise Reduction 1 is available for the sub-receiver.

However, the level cannot be adjusted.

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