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47 lines
2.1 KiB
Plaintext
47 lines
2.1 KiB
Plaintext
// Status=review
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The WSJT-X Wide Graph window displays the frequency spectrum of the received audio. Usually, the
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upper portion of the window shows a waterfall plot of the frequency spectrum (a spectrogram) and
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a line plot of the current or average spectrum. Controls at the bottom of the window are used to
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set up the displayed audio frequency range, color palette, and scaling of the spectrum displays.
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A control on the bottom right of the Wide Graph (displayed as *Spec nn%*) lets you control
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the vertical fraction of the window occupied by the spectrum line plot.
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It is important to set appropriate lower and upper
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audio frequency limits for the Wide Graph because these limits define the FT8 decoder's search window.
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For this tutorial, the limits will be set to cover 100-3300 Hz:
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- Set *Start* = 100 Hz.
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- Set *Bins/Pixel* = 5. Smaller/larger values make the Wide Graph cover a smaller/larger
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frequency range.
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- Use the mouse to grab the left or right edge of the *Wide Graph*, and
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adjust its width so that the upper frequency limit is about 3300 Hz.
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The *N Avg* setting controls how many spectra are averaged to produce each line in the spectrogram.
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Smaller values make the spectrogram update more frequently, resulting in signals being more spread
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out in the vertical (time) direction.
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On the other hand, larger values make it easier to detect very weak signals:
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- Set *N Avg* = 2.
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The *Palette* setting controls the color scheme used for the spectrogram:
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- Set *Palette* = Fldigi
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When *Flatten* is checked, WSJT-X attempts to correct for slope or curvature in the receiver's
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passband shape.
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- *Flatten* = checked
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The line plot can be set to display the current (un-averaged) spectrum or the cumulative (averaged)
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spectrum:
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- Select *Cumulative* for data display
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- Set the *Gain* and *Zero* sliders for the waterfall and spectrum to near midscale
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The *Spec nn%* setting determines what fraction of the vertical extent of the Wide Graph will
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be used for the line plot of the spectrum. Setting *Spec* to 0 will eliminate the line plot and
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a setting of 100 will eliminate the spectrogram and show only the line plot:
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- Set *Spec* = 50%
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