Kenwood TS-990S - Manual (Page 141)

REJECTING INTERFERENCE 6
6-3
Index Contents
Note:
◆ RX filter type C cannot be selected if "2" is configured for Menu
6-06, "RX Filter Numbers".
CONFIGURING THE NUMBER OF RX FILTERS
SELECTABLE
You can configure 3 (for A, B, and C) or 2 (for A and B) for
the number of RX filters.
1 Select Group No. 6, "TX/RX Filters & Misc", from the
Menu screen.
2 Access Menu 06, "RX Filter Numbers".
3 Press [SELECT] (F4) to allow editing of the parameter
box.
4 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH
control to select the filter.
You can select either "2" or "3". The default is "3".
5 Press [ ] (F1).
6 Press [MENU] to exit.
SELECTING THE ROOFING FILTER
The roofing filter suppresses strong radio interference
signals adjacent to the target signal. The filter selections
for the main band are Auto, 270 Hz, 500 Hz, 2.7 kHz, 6
kHz, 15 kHz, and Add (an additional roofing filter).
The sub band is locked to Auto.
[F1] [F7]
[ESC]
[FIL/SEL] (M)
[LO/WIDTH]
[HI/SHIFT]
1 Select the main band.
2 Press and hold [FIL/SEL] (M) to open the RX Filter
screen.
3 Press [FILTER] (F2) or [FIL/SEL] (M) to select the
receive filter.
You can select the desired RX filter (A, B, or C).
4 Press [ROOF] (F3) to enable to edit the Roof Filter.
5 Subsequently, press [ROOF] (F3) to select the
passband width.
• Each time you press [ROOF] (F3), the selection cycles as
follows: Auto > 270 > 500 > 2.7 k > 6 k > 15 k > Add > Auto.
• Each long press of [ROOF] (F3) cycles the selection in the
reversed sequence. Rotating the MULTI/CH control can
also change the passband width.
• The default is "Auto" for RX filters A, B, and C.
6 Press [ESC] to exit.
Note:
◆ The roofing filter, the bandwidth of which is wider than the
passband width of the DSP filter, will be selected if there are any
changes in the cutoff frequencies (low and high frequencies), and
passband width and its shift from the center frequency while Auto is
selected for the current filter.
◆ “Add.” in the passband width appears if the additional roofing
filter is installed in the transceiver and anything other than “Off” is
configured for Advanced Menu 6. {page 16-22}
◆ While the RX Filter screen is open, rotating the HI/SHIFT or
LO/WIDTH control will change the activated cutoff frequencies
(low and high frequencies). The cutoff frequencies (low and high
frequencies) appear on the RX Filter screen.
◆ In FM mode, 15 kHz will be configured and cannot be changed.