Vertex Standard FT-950 manual Narrow NAR One-Touch if Filter Selection, Off Ssb, Rtty/Pkt-L/Pkt-U

FT-950

Operating Manual

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:

Operating Mode	[NAR] Switch
	“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

53 Vertex Standard Co., Ltd.