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54 lines
2.3 KiB
Plaintext
54 lines
2.3 KiB
Plaintext
// Status=review
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The following controls appear at the bottom of the Wide Graph window.
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With the exception of *JT65 nnnn JT9*, they affect only the graphical
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displays — they have no effect on the decoding process.
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image::wide-graph-controls.png[align="center",alt="Wide Graph Controls"]
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- *Bins/Pixel* controls the displayed frequency resolution. Set this
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value to 1 for the highest possible resolution, or to higher numbers
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to compress the spectral display. Normal operation with a convenient
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window size works well at 2 to 8 bins per pixel.
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- *JT65 nnnn JT9* sets the dividing point (blue marker) for wide-band
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decoding of JT65 and JT9 signals in *JT9+JT65* mode. The decoder
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looks for JT65 signals everywhere, but JT9 signals only above this
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frequency.
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- *Start nnn Hz* sets the low-frequency starting point of the
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waterfall frequency scale.
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- *N Avg* is the number of successive FFTs to be averaged before
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updating the spectral display. Values around 5 are suitable for
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normal JT9 and JT65 operation. Adjust *N Avg* to make the waterfall
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move faster or slower, as desired.
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- A dropdown list below the *Palette* label lets you select from a
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wide range of waterfall color palettes.
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- Click *Adjust* to activate a window that allows you to create a
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user-defined palette.
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- Check *Flatten* if you want _WSJT-X_ to compensate for a sloping or
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uneven response across the received passband. For this feature to
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work properly, you should restrict the range of displayed frequencies
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so that only the active part of the spectrum is shown.
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- Select *Current* or *Cumulative* for the spectrum displayed in the
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bottom one-third of the Wide Graph window. *Current* is the average
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spectrum over the most recent *N Avg* FFT calculations. *Cumulative*
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is the average spectrum since the start of the present UTC minute.
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*Linear Avg* is useful in JT4 mode, especially when short-form
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messages are used.
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- Four sliders control reference levels and scaling for waterfall
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colors and the spectrum plot. Values around midscale are usually
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about right, depending on the input signal level, the chosen palette,
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and your own preferences.
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- *Smoothing* is active only when *Linear Average* has been selected.
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Smoothing the displayed spectrum over more than one bin can enhance
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your ability to detect weak EME signals with Doppler spread more than
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a few Hz.
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