Kenwood TS-480HX DSP Filters, Rejecting Interference, Changing the DSP Filter Bandwidth

10 REJECTING INTERFERENCE

DSP FILTERS

KENWOOD digital signal processing (DSP) technology is adapted to this transceiver. Using DSP filtering (AF), you can control the bandwidth, cancel the multiple jamming beat, and reduce the noise level using DSP filtering technology.

CHANGING THE DSP FILTER BANDWIDTH

For improving interference reduction capability, this transceiver also provides the DSP filtering (AF) along with IF filters. When in SSB, FM, or AM mode, you can change the filter bandwidth by altering its low and/ or high cut-off frequency. For CW and FSK modes, you can change the filter bandwidth by directly specifying a bandwidth. Changing the DSP filter bandwidth (AF) does not affect the current reception frequency.

■SSB/ FM/ AM

1 Press [MODE] to select SSB, FM, or AM mode. 2 Press [FIL/ NAR].

•The current high-cut filter frequency for the mode appears on the sub-display.

3Turn the MULTI control clockwise to raise the high cut-off frequency, or counterclockwise to lower the high cut-off frequency.

IF

MULTI SHIFT

f

IF

MULTI SHIFT

f

4Press [FIL/ NAR] again.

• The current low-cut filter frequency appears.

5Turn the MULTI control clockwise to raise the low cut-off frequency, or counterclockwise to lower the low cut-off frequency.

6To return to the normal operation, press [FIL/ NAR] or [MTR/ CLR].

IF

MULTI SHIFT

f

IF

MULTI SHIFT

f

Adjust	Mode	Frequency Selections (Hz)
		1000, 1200, 1400, 1600,
	SSB/	1800, 2000, 2200, 2400,
HI	FM	2600, 2800, 3000, 3400
		(default), 4000, 5000
	AM	2500, 3000 (default), 4000,
		5000
	SSB/	0, 50, 100 (default), 200,
		300, 400, 500, 600, 700,
	FM
LO		800, 900, 1000
	AM	0, 100 (default), 200, 500

Note:

◆The cut-off frequencies (LO) can be adjusted independently for each operating mode. When you change the operating mode, the previous setting is recalled for each operating mode.

◆When the DSP filter for data communication (Menu No. 45) is ON, you cannot change the DSP filter bandwidth. Select “oFF” to adjust the DSP filter bandwidth.

■CW/ FSK

1 Press [MODE] to select CW or FSK mode.

2 Press [FIL/ NAR].

•The current DSP filter bandwidth (AF) appears.

3Turn the MULTI control clockwise to increase (wider) the bandwidth, or counterclockwise to decrease (narrower) the bandwidth.

Pass band (AF)

	Interfering	Desired	Interfering
	signal	signal	signal
Mode	Bandwidth Selections (Hz)			Default
				(Hz)
CW	50, 80, 100, 150, 200, 300, 400,			600
	500, 600, 1000, 2000
FSK	250, 500, 1000, 1500			1500

4As for CW, you can further adjust the RX pitch frequency. Access Menu No. 34 and turn the MULTI control to adjust the RX pitch frequency from 400 to 1000 Hz in steps of 50 Hz. The default RX pitch frequency is 800 Hz {page 29}.

5To return to the current operating mode, press [MTR/ CLR] or [FIL/ NAR].

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