It has no effect on the decoding of signals. The wide graph display is used to locate WSJT-x digitally encoded signals and establish their "Base" frequency by identification of a pilot tone (for JT65), a lower frequency tone (for JT4) or other reference point (QRA64). The waterfall display shows the audio spectrum as a function of time, with the amount of energy at any particular audio frequency represented as regions of different colors or intensity of colors. However, when the "reference spectrum" (Ref Spec) option is chosen, both the visual display data and the actual data used for decoding has flattening applied, as does any saved. The actual audio used by WSJT-X for decoding is NOT flattened.
Important note: When the flattening option of "flatten" is chosen, only the visual display of the spectrum is affected. I will also to focused on the use of the wide band display in connection with microwave EME, where signal spreading and widely spaced tones are found and QRM from other stations is rare.
This is a conventional radio (not SDR) and as far as I know doesn't use digital processing in the audio output stages (unless digital based filtering is selected). For the purposes of this article I'll be talking about the audio output from the transceiver I use myself, The Yaesu FT-897. Since WSJT-X uses USB mode, this is typically from about 300Hz to 2500Hz, though some more recent, digital based receivers may offer a wider bandwidth option.
The Wide Graph window in WSJT-X is a waterfall display of the signals present in the receiver audio output bandwidth. WSJT-X Wide Graph (waterfall) optimization for EME use
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