FT-2000
Operating Manual
Vertex Standard Co., Ltd.
54
the [SHIFT] knob in the 12 o’clock position. In Figure (B), an interfering signal has
appeared inside the original passband. In Figure (C), you can see the effect of rotating
the [SHIFT] knob so as to reduce the interference level by moving the filter passband
so that the interference is outside of the passband.
WIDTH (IF DSP Bandwidth) Tuning (SSB/CW/RTTY/PKT Modes)
The IF Width tuning system allows you to vary the width of the DSP IF passband, so
as to eliminate interference. Moreover, the bandwidth may actually be
expanded
from
its default setting, should you wish to enhance incoming signal fidelity when
interference on the band is low.
Rotate the [WIDTH] knob to adjust the bandwidth. Counter-clockwise rotation reduces
the bandwidth, while clockwise rotation increases the bandwidth.
Advice:
The IF Width effects to the Main band (VFO-A) only.
The bandwidth of the IF width can be observed on the display.
Referring to Figure B, you can see the default bandwidth with the [WIDTH] knob set to
the 12 o’clock position.
By rotating the [WIDTH] knob to the left, the bandwidth will narrow (see Figure (A)),
while rotation of the [WIDTH] knob to the right, as depicted in Figure (C), will widen
the bandwidth.
The default bandwidths, and total bandwidth adjustment range, will vary according to
the operating mode:
SSB Mode
200 Hz ~ 4.0 kHz (bandwidth at 12 o’clock position of [WIDTH] knob: 2.4 kHz).
CW/RTTY/PKT Modes
25 Hz ~ 2.4 kHz (bandwidth at 12 o’clock position of [WIDTH] knob: 500 Hz).
Using IF Shift and Width Together
The IF Shift and Variable IF Width features together form a very effective
interference-fighting filtering system.
For example, in Figure (A) you can see how interference has appeared both on the high
and low sides of the desired signal. By rotating the [WIDTH] knob, as shown in Figure
(B), the interference from one side can be eliminated, and by re-positioning the
