Dsp Filter; Changing The If Filter Bandwidth Characteristics; Switching The Rx Fiter Configurations - Kenwood TS-990S Instruction Manual

6 REJECTING INTERFERENCE
The center frequency of the narrow bandwidth tunable
filter can be selected by moving the Preselector
bandwidth.
1 Select the main band.
2 Press and hold [P.SEL] (F) while Preselector is
enabled to open the Preselector screen.
3 Press [ ] (F4) or [
MULTI/CH control to shift the center frequency.
• You can shift and determine the filter position. Pressing
[CENTER] (F1) places the filter center at the center
frequency.
• The default is at the center position.
4 Press [ESC] to exit.
Note:
◆ Pressing [P.SEL] (F), when the frequency shifted outside the
amateur band while operating in the main band, cannot enable the
Preselector.
◆ "Outside of the Band" appears when the frequency is changed
while the Preselector screen is open and when that frequency
would shift outside the amateur band. The key guide display will
be changed to [P.SEL OFF] (F) in place of [P.SEL] (F). Pressing
[P.SEL OFF] (F) disables the Preselector, and the Preselector
screen closes.
6-2
] (F5), or rotate the

DSP FILTER

The transceiver was designed with integral digital signal
processing (DSP) technologies. Changing the filter
bandwidth using the DSP function can help suppress the
interference, and reduce the noise level.
CHANGING THE IF FILTER BANDWIDTH
CHARACTERISTICS

SWITCHING THE RX FITER CONFIGURATIONS

The configurations (Types A, B and C) for the IF filters can
instantly be switched according to your operating needs.
For example, wide bandwidth characteristics can be
configured for A, standard bandwidth characteristics is
configured for B, and narrow bandwidth characteristics
for use during the contest or with the DX station can be
configured for C in advance. To search for a station you
wish to communicate, you may select the filter type A with
the wide bandwidth configured, and for use during the
contest or with the DX station, you may select the filter
type C with the narrow bandwidth configured to increasing
the readability.
The bandwidth characteristics can be configured by
combining the roofing filter, the IF filter and the AF filter,
the high frequency cutoff filter and the low frequency cutoff
filter, and WIDTH and SHIFT. Also, the RX filter type (Type
A, B, or C) can be configured for use in SSB, CW, FSK,
PSK, FM, and AM modes respectively.
[F1] [F7]
1 Press [FIL/SEL] (M) or [FIL/SEL] (S) to switch the
receive filter.
Each key press cycles the RX filter type as follows: A > B > C
> A.
[MENU] [MULTI/CH]
[FIL/SEL] (M) [FIL/SEL] (S)
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