Bedienungsanleitung Kenwood TS-870S (Seite 57 von 104) (Englisch)

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AGC AUTO

CTRL

SHIFT

DSP TOOLS

SLOPE TUNING (SSB/AM)

Changing the positions of the LO/WIDTH and HI/SHIFT

controls while in SSB or AM mode changes the cut-off

frequencies for the receive pass band. Controlling the

pass band in this way allows you to eliminate adjacent

frequency interference.

Turn the LO/WIDTH control clockwise to raise the

high-pass filter cut-off frequency; turn it

counterclockwise to lower the cut-off frequency. This is

effective in removing interference from frequencies

lower than your current operating frequency.

Turn the HI/SHIFT control clockwise to raise the

low-pass filter cut-off frequency; turn it

counterclockwise to lower the cut-off frequency. This is

effective in removing interference from frequencies

higher than your current operating frequency.

Using only these controls, you can eliminate a great

deal of interference on the phone bands. By using both

controls together carefully, you will increase your ability

to pick out weak signals from the interference.

IF SHIFT (CW)

For CW, the center frequency of the filter pass band can

be shifted without changing the current receive

frequency. This is an additional method of fighting

adjacent frequency interference. Change the CW

center frequency by adjusting the HI/SHIFT control.

When the control is adjusted, “SHIFT” and the newly

selected center frequency appears on the Display.

REJECTING INTERFERENCE

Be aware that shifting the CW center frequency does

not automatically adjust the receive CW pitch.

Therefore, it is possible to shift the CW pass band such

that the selected CW pitch frequency falls outside the

pass band. Doing this makes the CW signal inaudible.

Example:

Before adjusting IF Shift:

•CW pitch: 900 Hz

•IF Shift: 800 Hz (center frequency)

• CW Width: 600 Hz

In this example, the pass band would lie from

500 ~ 1100 Hz (from 300 Hz below the center frequency

of 800 Hz to 300 Hz above the center frequency). If the

CW pitch was set for 900 Hz, the signal would be

audible.

After adjusting IF Shift:

•CW pitch: 900 Hz

•IF Shift: 500 Hz (center frequency)

• CW Width: 600 Hz

Now, the pass band would lie from 200 ~ 800 Hz. With

the CW pitch set for 900 Hz, the signal would not be

audible since the pitch frequency is 100 Hz above the

upper edge of the pass band. In this case, to make the

signal audible, lower the CW pitch frequency by at least

100 Hz.

HI/SHIFT

USB pass band

LO/WIDTH

USB pass band

800

Frequency Selections

(Hz)

Mode

Default

Freq.(Hz)

400, 450, 500, 550,

600, 650, 700, 750,

800, 850, 900, 950,

1000

Center

frequency

Freq./ Filter

Relationship

0, 50, 100, 200, 300, 400,

500, 600, 800, 1000 Hz

0, 100, 200, 500 Hz

1.4, 1.6, 1.8, 2.0, 2.2, 2.4,

2.6, 2.8, 3.0, 3.4, 4.6, 6.0 kHz

2.5, 3.0, 4.0, 5.0, 6.0, 7.0 kHz

LO/WIDTH

Control

(high-pass

filter cutoff)

HI/SHIFT

Control

(low-pass

filter cutoff)

SSB

Frequency SelectionsAdjust

Mode

Default

Freq.

300 Hz

100 Hz

2.6 kHz

6.0 kHz

500 800 1100

900 Hz pitch

200 500 800

900 Hz pitch

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Kenwood TS-870S Seite 57

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