FT-950
Operating Manual
Vertex Standard Co., Ltd.
51
Scope) the effect of the Contour control while listening to the effect on the signal,
and this will help build your intuition on how best to use Contour tuning in the
future.
Reference to Figure (B), this show an “indentation” of the Contour filter is center of the
passband. The Contour filter is placing a low-Q “notch” (per the setting of Menu item
“068,” referenced above). Counter-clockwise rotation (to the left) of the [SELECT] knob
causes the indentation to move towered a lower frequency within the passband, while
clockwise rotation (to the right) causes the indentation to move toward a higher
frequency within the passband. By removing interference or unwanted frequency
components on the incoming signal, it is possible to make the desired signal rise out of
the background noise/interference, enhancing intelligibility.
Quick Point: The steep slopes of the DSP filtering can, when adjusted aggressively,
impart an unnatural sound to an incoming signal. Oftentimes, though, a narrow
bandwidth is not the key to improving copy; the incoming signal itself may have
undesirable or excessive frequency components, especially in the low-frequency range
around 100-400 Hz. By judicious use of the Contour filter, the “shoulder” of the
passband response may be altered, or components removed from within the passband,
allowing the desired signal to rise above the background noise and interference in a
manner not obtainable with other filtering systems.
IF SHIFT Operation (SSB/CW/RTTY/PKT/AM Modes)
IF SHIFT allows you to vary the DSP filter passband higher or lower, without changing
the pitch of the incoming signal, so as to reduce or eliminate interference. Because the
carrier tuning frequency is not varied, there is no need to re-tune the operating
frequency when eliminating the interference. The total passband tuning range for the
IF SHIFT system is ±1 kHz.
1. Press the [SHIFT] button. The LED inside the [SHIFT] button glows orange. The
[SELECT] knob works as the IF SHIFT knob. The center position of the IF
passband appears in the SHIFT indicator on the display.
2. Rotate the [SHIFT] knob to the left or right to reduce the interference.
3. Press the [CLEAR] button to move the filter passband to center.
Advice: The center position of the IF passband will be memorized independently on
