Kenwood TS-890S Operation Manual - Page 88

Configuring the RX Filter

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6 REJECTING INTERFERENCE Configuring the RX Filter The steps to configure the settings for the different types of RX filters are as follows. Selecting a Roofing Filter A roofing filter helps to reduce strong interference signals that are next to the target signal. 1 Press and hold [IF FIL] to display the RX Filter screen. Switching the IF Filter Shape 3 types of IF filter shapes are available for selection according to the condition of interference and operation. 1 Press and hold [IF FIL] to display the RX Filter screen. .. . 2 Press [IF FIL] or F2 [FILTER] to select an RX filter (FIL-A/B/C). 3 Press F3 [ROOF]. Pressing F3 [ROOF] each time switches the passband width. Setting Value Auto (default)/ 270/ 500/ 2.7 k/ 6 k/ 15 k [Hz] Auto: A roofing filter with a bandwidth wider than the passband width of the DSP filter is automatically selected using high cutoff/low cutoff or Width/Shift. (If there are 2 or more bandwidths that satisfy the conditions, the narrower one is selected.) • In the AM mode, a 6 kHz roofing filter is automatically selected if the high cutoff frequency is 3 kHz or lower, and a 15 kHz roofing filter is selected if the high cutoff frequency is higher than 3 kHz. • In the FM mode, the option is fixed at 15 kHz and cannot be changed. • 270 Hz is available for selection when the optional YG-82CN-1 is attached. • Pressing and holding F3 [ROOF] each time switches the options in the reverse sequence. • The passband width can also be altered by turning the [MULTI/CH] control. • "RFT:xxxx" is displayed at the bottom right of the filter scope. [xxxx:270/ 500/ 2.7k/ 6k/ 15k] 4 Press and hold [IF FIL] or press [ESC] to end the process. ● The IF passband width for the AM mode is twice the value of the high cutoff frequency. Example: If the frequency is 3,000 Hz, the IF passband width will be 6 kHz. 2 Press [IF FIL] or F2 [FILTER] to select an RX filter. 3 Press F4 [IF]. Pressing F4 [IF] each time switches the shape of the filter. Setting Value Medium (default)/ Soft/ Sharp • Pressing and holding F4 [IF] each time switches the options in the reverse sequence. • The filter shape can also be altered by turning the [MULTI/CH] control. • The IF filter option is displayed as "-" and cannot be altered in the FM mode. 4 Press and hold [IF FIL] or press [ESC] to end the process. Switching the AF Filter Type 3 types of audio frequency passbands are available for selection. 1 Press and hold [IF FIL] to display the RX Filter screen. 2 Press [IF FIL] or F2 [FILTER] to select an RX filter. 3 Press F5 [AF]. Pressing F5 [AF] each time switches the shape of the IF filter. Setting Value Medium (default)/ Wide/ Narrow • Pressing and holding F5 [AF] each time switches the options in the reverse sequence. 4 Press and hold [IF FIL] or press [ESC] to end the process. 6-2

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Configuring the RX Filter
The steps to configure the settings for the different types of RX
filters are as follows.
Selecting a Roofing Filter
A roofing filter helps to reduce strong interference signals that are
next to the target signal.
1
Press and hold [IF FIL] to display the RX Filter
screen.
2
Press [IF FIL] or F2 [FILTER] to select an RX filter
(FIL-A/B/C).
3
Press F3 [ROOF].
Pressing
F3 [ROOF]
each time switches the passband width.
Setting Value
Auto (default)/ 270/ 500/ 2.7 k/ 6 k/ 15 k [Hz]
Auto:
A roofing filter with a bandwidth wider than the passband
width of the DSP filter is automatically selected using high
cutoff/low cutoff or Width/Shift. (If there are 2 or more
bandwidths that satisfy the conditions, the narrower one is
selected.)
•
In the AM mode, a 6 kHz roofing filter is automatically
selected if the high cutoff frequency is 3 kHz or lower, and a
15 kHz roofing filter is selected if the high cutoff frequency
is higher than 3 kHz.
•
In the FM mode, the option is fixed at 15 kHz and cannot be
changed.
•
270 Hz is available for selection when the optional
YG-82CN-1 is attached.
•
Pressing and holding
F3 [ROOF]
each time switches the
options in the reverse sequence.
•
The passband width can also be altered by turning the
[MULTI/CH]
control.
•
“
RFT:xxxx
”
is displayed at the bottom right of the filter scope.
[xxxx:270/ 500/ 2.7k/ 6k/ 15k]
4
Press and hold [IF FIL] or press [ESC] to end the
process.
●
The IF passband width for the AM mode is twice the
value of the high cutoff frequency.
Example: If the frequency is 3,000 Hz, the IF passband
width will be 6 kHz.
Switching the IF Filter Shape
3 types of IF filter shapes are available for selection according to
the condition of interference and operation.
1
Press and hold [IF FIL] to display the RX Filter
screen.
2
Press [IF FIL] or F2 [FILTER] to select an RX filter.
3
Press F4 [IF].
Pressing
F4 [IF]
each time switches the shape of the filter.
Setting Value
Medium (default)/ Soft/ Sharp
•
Pressing and holding
F4 [IF]
each time switches the options
in the reverse sequence.
•
The filter shape can also be altered by turning the
[MULTI/CH]
control.
•
The IF filter option is displayed as “-” and cannot be altered
in the FM mode.
4
Press and hold [IF FIL] or press [ESC] to end the
process.
Switching the AF Filter Type
3 types of audio frequency passbands are available for selection.
1
Press and hold [IF FIL] to display the RX Filter
screen.
2
Press [IF FIL] or F2 [FILTER] to select an RX filter.
3
Press F5 [AF].
Pressing
F5 [AF]
each time switches the shape of the IF filter.
Setting Value
Medium (default)/ Wide/ Narrow
•
Pressing and holding
F5 [AF]
each time switches the
options in the reverse sequence.
4
Press and hold [IF FIL] or press [ESC] to end the
process.
6 REJECTING INTERFERENCE
6-2