User's Manual

FT-950

Operating Manual

Vertex Standard Co., Ltd.

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. Press the [WIDTH] button then rotate the

[SELECT(WIDTH)] knob, the interference from one side can be eliminated (Figure “B”).

Next, press the [SHIFT] button and rotate the [SELECT(SHIFT)] knob to

re-positioning the passband (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 (described later) may also be utilized, in conjunction with the

three other filter systems, to significant advantage.

NARROW (NAR) One-Touch IF Filter Selection

Pressing the [NAR] button provides one-touch, mode-specific selection of a narrow IF

DSP filter setting that does not depend on the setting of the [WIDTH] knob. Pressing

the [NAR] button once more returns the bandwidth control to the WITDH/SHIFT

system. The factory default bandwidths are:

[NAR] Switch

Operating Mode

“ON” “OFF”

SSB 200 Hz ~ 1.8 kHz* (1.8 kHz)

1.8 ~ 3.0 kHz* (2.4 kHz)

CW 100 ~ 500 Hz* (500 Hz) 500 Hz ~ 2.4 kHz* (2.4 kHz)

RTTY/PKT-L/PKT-U 100 ~ 500 Hz* (300 Hz) 500 Hz ~ 2.4 kHz* (500 Hz)

PKT-FM 9 kHz 16 kHz

AM 6 kHz 9 kHz

FM (28/50 MHz Bands) 9 kHz 16 kHz

*: Depends on the [WIDTH] knob

(): Default Bandwidth

Advice:

 When the narrow bandwidth is selected, the “NAR” icon will appear in the display.

 Even if the [NAR] button has been pressed so as to engage the narrow filter, you

may adjust the IF bandwidth by rotating the [SELECT(WIDTH)] knob (requires