Kenwood TS-570S, TS-570D Rejecting Interference, If Filter, Noise Blanker, If Shift

REJECTING INTERFERENCE

1	IF FILTER	IF SHIFT
	The IF filters are designed for selecting the exact range	For SSB, CW, or FSK mode, shifting the center
	of intermediate frequencies that are sent to the next	frequency of the filter pass band is an additional method
	stage in the receive circuit. Interference adjacent to the	of fighting adjacent frequency interference. Shifting this
2	desired signal can be reduced by selecting a narrow	center frequency does not change the current receive
	bandwidth filter and/or shifting the center frequency of	frequency.
	the filter.	To remove interference that is higher in frequency than
3	To more effectively remove interference, use the IF	the desired signal, turn the IF SHIFT control
	filters with the DSP filters described on pages 37	counterclockwise. To remove interference that is lower
	and 38.	in frequency than the desired signal, turn the IF SHIFT
		control clockwise.

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CHANGING IF FILTER BANDWIDTH

When adjacent frequency interference is present at both sides of the desired signal, a narrow IF filter bandwidth may be the best way to remove the interference. Changing the filter bandwidth will not effect the current receive frequency.

To use a narrow filter in SSB, CW, or FSK mode, install the appropriate optional filter {page 58}, and select the appropriate setting in Menu No. 46.

When in CW or FSK mode, the wide filter or the narrow filter is automatically selected, depending on the bandwidth of the DSP filter that you select. Refer to “CHANGING RECEIVE BANDWIDTH” {page 37}. The default in SSB or AM mode is wide bandwidth. In FM mode, you cannot change the filter bandwidth.

Note: When you use Menu B, make sure to select the appropriate filter bandwidth via Menu No. 46 in Menu B.

Desired Interfering

signal signal

NOISE BLANKER

Noise Blanker was designed to reduce pulse noise such as that generated by automobile ignitions. Noise Blanker does not function in FM mode.

Press [NB] to toggle Noise Blanker ON or OFF.

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• “NB” appears when the function is ON.

Interfering	Desired	Interfering
signal	signal	signal

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1Select SSB or AM mode.

2Press [FILTER].

• The current filter selection appears.

3Turn the MULTI/CH control to select Wide (“FIL-WID”) or Narrow (“FIL-NAR”).

4Press [FILTER] to complete the setting.

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