FT-2000
Operating Manual
Vertex Standard Co., Ltd.
55
[SHIFT] knob (Figure (C)), the interference on the opposite side can be removed,
without re-introducing the interference previously eliminated in Figure (B).
Advice: For best interference reduction, the Width and Shift features are the primary
tools you should use. After narrowing the bandwidth (Width) and/or adjusting the
center of the passband (Shift), the Contour control may also yield additional
signal-enhancement benefits on the net residual bandwidth. What’s more, the IF Notch
Filter (see the next section) may also be utilized, inconjunection with the three other
filter systems, to significant advantage.
IF Notch Filter Operation (SSB/CW/RTTY/PKT/AM Modes)
The IF Notch filter is a highly-effective system that allows you to slice out an
interfering beat note or other carrier signal from inside the receiver passband.
1. Press the [NOTCH] button. The Notch characteristic will appear in the display to
confirm that the Notch filter is engaged.
2. First in beginning, rough center frequency of the IF Notch Filter is adjusted by the
outer [COARSE] knob, next fine center frequency is adjusted by the inner [FINE]
knob.
3. First in beginning, rough center frequency of the IF Notch Filter is adjusted by the
outer [COARSE] knob, next fine center frequency is adjusted by the inner [FINE]
knob.
4. Rotate the [COARSE] knob to null out the interfering carrier by roughly, next
rotate the [FINE] knob to null out the interfering carrier by fine.
5. To switch the IF Notch filter off, press the [NOTCH] button once more. The Notch
characteristic will turn off, confirming that the IF Notch filter is no longer
operating.
Advice:
The IF Notch filter effects to the Main band (VFO-A) only.
The width of the IF Notch null may be adjusted using Menu item “091 rdSP
NOTCH W.” Both “Wide” and “Narrow” selections are available, with “Narrow”
providing the least disruption of the “desired” signal.
When the optional DMU-2000 Data Management Unit is connected, the effect of
the IF Notch filter may be observed on the Audio Scope (on the “Oscilloscope” page).
The Notch will be observed as a “dip” in the noise platform observed. What’s more,
the “Waterfall” display may be used to observe the effect of the IF Notch filter,
