User's Manual

FT-950
Operating Manual
Vertex Standard Co., Ltd.
52
each VFO stack of the VFO-A and VFO-B.
Referring to Figure (A), note the depiction of the IF DSP filter as the thick line, with
the [SELECT(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 [SELECT(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.
1. Press the [WIDTH] button. The LED inside the [WIDTH] button glows orange.
The [SELECT] knob works as the WITDH knob. The current bandwidth appears in
the WIDTH indicator on the display.
2. Rotate the [SELECT] knob to the left or right to reduce the interference.
3. Press the [CLEAR] button to set the bandwidth to default.
Advice: The IF Bandwidth will be memorized independently on each VFO stack of the
VFO-A and VFO-B.
Referring to Figure B, you can see the default bandwidth on the SSB mode by pressing
the [CLEAR] button.
By rotating the [SELECT(WIDTH)] knob to the left, the bandwidth will narrow (see
Figure (A), while rotation of the [SELECT(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: 1.8 kHz ~ 3.0 kHz (default: 2.4 kHz).
CW Mode: 500 Hz ~ 2.4 kHz (default: 2.4 kHz)
RTTY/PKT Modes: 500 Hz ~ 2.4 kHz (default: 500 Hz)