Kenwood TS-850S - Manual (Page 39)

[ II ] Filter key
The filter bandwidth for the 8.83 MHz and 455
kHz ifs can be selected from the front panel. Up
to 3 additional filter bandwidths may be added
thru the installation of optional filters.
8.83MHz filter bandwidth
The value changes each time the 8.83 switch
is pressed.
-►6k -►2.7k 500
No indicator
(LC Filter)
-270-^-
Notes
1. This function is not active in the FM mode.
2. Some bandwidths cannot be selected unless
the required filter is installed.
3. When an optional filter is installed, change
the filter switch. (Please refer to Section 7-1.)
4. If the YK-88SN-1 is installed, install it where
the YK-88C-1 or YK-88CN-1 is installed. The
number 500 or 270 is displayed.
455kHz filter bandwidth
The value changes each time the 455 switch is
pressed.
------ ► 12k ---------► 6k ------------------
500 2.7k
Notes
1. In the FM mode, only 12 kHz (wide) and 6
kHz (narrow) can be selected.
2. Some bandwidths cannot be selected unless
the required filter is installed.
3. Either optional YG-455C-1 or YG-455CN-1
can be installed. When the YG-455CN-1 is
installed, 500 is displayed.
4. When an optional filter is installed, change
the filter switch. (Please refer to Section 7-1.)
Initial state
FILTER
MODE
8.83MHz 455kHz
SSB, CW, FSK 2.7k 2.7k
AM 6k 6k
FM 12k
Note
When bandwidth of the 8.83 MHz filter is
approximately the same as that of the 455 kHz
filter, the combined bandwidth will be narrower
than the indicated bandwidth.
For example, when both the 8.83 MHz and 455
kHz filters are set to 2.7k, the combined bandwidth
will be about 2.4 kHz.
[Ill] NOTCH control (Except FM mode)
Use this control when you are experiencing
interference from a CW heterodyne type signal. Turn
the NOTCH ON and slowly adjust the NOTCH
control to minimize the beat signal. A beat of
approximately 1.5 kHz can be reduced at the
approximate center position of the control. Please
note that this control will not eliminate SSB, AM or
FM type interference. The bandwidth of such signals
is approximately 3-6 kHz wide. When in the USB,
CW or AM mode a beat tone lower than the center
frequency can be reduced by rotating the control
clockwise from the center point. In LSB or FSK
mode adjust the control counterclockwise.
Notes
1. The NOTCH frequency can be varied within a
range of approximately 400 to 2600 Hz.
2. When an interfering signal such as a CW station
appears, slowly rotate the NOTCH control. If
you rotate the knob too quickly you may pass
right over the notch point. Slow rotation will yield
best results.
3. The NOTCH frequency may be shifted by the
SLOPE TUNE position. Operate the SLOPE
TUNE control, then the NOTCH control.
4. If the NOTCH frequency equals the frequency of
the desired signal (SSB), the desired signal is
attenuated slightly, but this is not in an error.
5. Since the notch is a filter with a very sharp
attenuation characteristic, the adjustment point
may be shifted. (Please refer to Section 6-6-6.)
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