Bedienungsanleitung Kenwood TS-480SAT (Seite 53 von 104) (Englisch)

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REJECTING INTERFERENCE

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■ FM

In FM mode, you cannot change the reception IF filter

bandwidth. The bandwidth is fixed at 12 kHz.

IF SHIFT (SSB/ CW/ FSK)

Shifting the center frequency of the filter pass band is

an additional method of removing adjacent frequency

interference. Shifting this center frequency does not

change the current reception frequency.

To remove interference that is higher in frequency

than the desired signal, turn the IF SHIFT control

counterclockwise. To remove interference that is

lower in frequency than the desired signal, turn the IF

SHIFT control clockwise.

MULTI

SHIFT

Desired

signal

Interfering

signal

IF pass band

IF FILTER

The IF filters are designed for selecting the exact

range of intermediate frequencies that are sent to the

next stage in the receive circuit. Interference

adjacent to the desired signal can be reduced by

selecting a narrow bandwidth filter and/ or shifting the

center frequency of the filter.

To more effectively remove interference, combine the

IF filtering and the DSP filtering (AF) described on

pages 46 and 47.

CHANGING THE IF FILTER BANDWIDTH

When adjacent frequency interference is present at

both sides of the desired signal, narrowing IF filter

bandwidth may be the best way to remove the

interference. Changing the filter bandwidth will not

effect the current reception frequency.

You can install 2 optional IF filters for SSB, CW, and

FSK modes. After installing the optional filters

{page 81}, the transceiver automatically recognizes

what type of optional filters are installed.

■ SSB/ AM

When you operate the transceiver in SSB or AM

mode, you can manually select the wide or narrow

filter.

Press [FIL/ NAR] (1 s) to select another IF filter.

• Each press of [FIL/ NAR] (1 s) changes “ ”

(Normal) / “NAR”, then back to “ ” (Normal).

• If Menu No. 17 is ON (default is OFF) and 2 IF

filters have been installed, you can select

secondary IF filter. In this case, each press of

[FIL/ NAR] (1 s) changes “ ” (Normal) / “NAR”

/ “NAR 2”, then back to “ ” (Normal).

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Optional YF-107SN filter must be installed.

Optional YF-107C filter must be installed and Menu No. 17 must

be set to ON.

Optional YF-107CN filter must be installed and Menu No. 17

must be set to ON.

■ CW/ FSK

When you operate in CW or FSK mode, the wide filter

or narrow filter is automatically selected according to

the DSP filter bandwidth that you select.

The following table describes how the optional filter is

selected as you change the bandwidth of DSP filter.

You cannot manually select the IF filter. To change

the DSP filter bandwidth, refer to “CHANGING THE

DSP FILTER BANDWIDTH” {page 46}.

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