Vertex Standard FT-857 Manual Do Utilizador

 (DBF) 

(R

)

In the CW mode, pressing the [C](DBF) key in Multi Function Row “p” [DNR, DNF, DBF]
activates a narrow-bandwidth peaking filter, which may be ideal for use under very crowded
conditions. The DSP CW Peaking Filter also is especially helpful under VHF/UHF weak-
signal situations.

The center frequency of the DSP CW Peaking Filter is automatically aligned to be centered
on the response you have selected via the Menu Mode in item No-027 [CW PITCH]. See
page 101 for details.

1. To change the bandwidth of the DSP CW Peaking Filter:
2. Press and hold in the [C](DBF) key for one second on the CW mode. This instantly

activates Menu Mode No-045 [DSP BPF WIDTH], which allows selection of the band-
width of the DSP CW Peaking Filter.

3. Rotate the DIAL to select the desired bandwidth. The available values are 60 Hz, 120

Hz, and 240 Hz (default value: 240 Hz).

4. When you have made your selection, press and hold in the [FUNC] key for one second

to save the new setting and return to normal operation.

 (DNR) 

(R

)

The Noise Reduction feature of the DSP system may be used to enhance signal-to-noise
ratio on weak signals.

1. Press the [DSP] key momentarily. This instantly activates Multi Function Row “p” [DNR,

DNF, DBF].

2. Press the [A](DNR) key to activate the DSP Noise Reduction feature. The “u” icon will

appear at the left side of the “DNR” indication, and the “

”  notation will appear at

the top on the display.

3. Now press and hold in the [A](DNR) key for one second. This instantly activates Menu

Mode No-049 [DSP NR LEVEL], which allows adjustment of the DSP Noise Reduction
level.

4. Rotate the DIAL to find the point where best signal-to-noise ratio is obtained under the

current noise conditions.

5. Press and hold in the [FUNC] key for one second to save the new setting and exit to

normal operation.

6. To turn off the DSP Noise Reduction feature, press the [A](DNR) key again.