Kenwood TS-570S TS-570D - Manual (Page 43)

37
9 REJECTING INTERFERENCE
ATTENUATOR
Attenuator reduces the level of received signals. This
function is useful when interference from adjacent
frequencies is strong.
Press [ATT] to toggle Attenuator ON or OFF.
• “ATT” appears when the function is ON.
The ON/OFF setting will automatically be stored in the
current band. Each time you select the same band, the
same setting will automatically be selected.
The frequency range of each band is shown below.
PREAMPLIFIER
Switching Preamplifier OFF also may help to reduce
interference from adjacent frequencies.
Press [PRE-AMP] to toggle ON or OFF.
• “PRE-AMP” appears when the function is ON.
The ON/OFF setting will automatically be stored in the
current band. Each time you select the same band, the
same setting will automatically be selected.
The frequency range of each band is the same as for
the Attenuator. The default of Preamplifier is OFF for
the bands from 30 kHz to 7.5 MHz, and ON for the
bands from 7.5 MHz to 60.0 MHz (TS-570D: 30.0 MHz).
Note: Switching Preamplifier OFF has the same effect as activating
the AIP function on other KENWOOD transceivers.
DSP TOOLS
KENWOOD digital signal processing (DSP) technology
is used for the functions described in this section.
CHANGING RECEIVE BANDWIDTH
For improving the interference reduction capability, this
transceiver also provides audio frequency (AF) filters
designed using DSP technology. When in SSB, FM, or
AM mode, you can change the filter bandwidth by
altering its low cut-off frequency and/or high cut-off
frequency. For CW and FSK modes, you can change
the filter bandwidth by directly specifying a bandwidth.
Changing the filter bandwidth does not affect the current
receive frequency.
You can also monitor signals trimmed off by the above
DSP filters. Consult “PROGRAM FUNCTION
BUTTON” {page 49} and assign the DSP Filter Monitor
function (No. 53) to any [PF] button. Press and hold the
[PF] button to monitor the trimmed signals; the DSP
filters will restore the default bandwidths. Release the
button to quit the function. You may use this function to
check how adjacent frequencies are in use.
■ SSB/ FM/ AM Modes
1 Select SSB, FM, or AM mode.
2 Turn the DSP SLOPE (LOW) control clockwise to
raise the low cut-off frequency, or
counterclockwise to lower the low cut-off
frequency.
Turn the DSP SLOPE (HIGH) control clockwise
to raise the high cut-off frequency, or
counterclockwise to lower the high cut-off
frequency.
The default cut-off frequencies depend on the
current positions of the DSP SLOPE controls.
14.50 ~ 18.50
18.50 ~ 21.50
21.50 ~ 25.50
25.50 ~ 30.00
30.00 ~ 60.00 (TS-570S)
0.03 ~ 2.50
2.50 ~ 4.10
4.10 ~ 7.50
7.50 ~ 10.50
10.50 ~ 14.50
Frequency range (MHz) Frequency range (MHz)
f
f
USB pass band
USB pass band
f
f
USB pass band
USB pass band
DSP SLOPE
(LOW) control
DSP SLOPE
(HIGH) control
Frequency Selections Adjust
10, 50, 100, 150, 200, 250, 300, 350,
400, 450, 500, 550, 600, 650, 700,
750, 800, 850, 900, 950, 1000 Hz
1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7,
1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2,
3.4, 3.6, 4.0, 4.4, 5.0 kHz