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WiNRADiO G39DDC User’s Guide
121
Appendix F – Waterfall Spectrum Palettes
The Waterfall spectrum uses color palettes, selectable using the Palette
control:
control:
The color palettes reside in ordinary text files with an extension “.pal”, located
in the application installation folder, i.e. typically
C:/Program files/WiNRADiO/G39DDC/Defs.
in the application installation folder, i.e. typically
C:/Program files/WiNRADiO/G39DDC/Defs.
The existing files are named Default.pal, Blue.pal, DeepBlue.pal, Gray.pal,
Magenta.pal, Rainbow.pal, Sepia.pal and Yellow.pal.
Magenta.pal, Rainbow.pal, Sepia.pal and Yellow.pal.
You can create your own additional palettes quite easily.
A palette file consists of 256 lines. The top line corresponds to the maximum
signal strength (max_SS) displayed by the waterfall, the bottom line
corresponds to the minimum signal strength (min_SS).
signal strength (max_SS) displayed by the waterfall, the bottom line
corresponds to the minimum signal strength (min_SS).
Each line contains a set of decimal RGB values separated by spaces (0 0 0
represents black; 255 255 255 is white). The incoming signal strength values
are mapped to this color space as follows:
represents black; 255 255 255 is white). The incoming signal strength values
are mapped to this color space as follows:
If the attenuator is off, the minimum signal level is -150 dBm, the maximum
level is 0 dBm. If the attenuator is on, the attenuation value is added to these
figures (for example, for 10 dB attenuation, the minimum displayed signal level
will be -140 dBm and the maximum level will be +10 dBm).
level is 0 dBm. If the attenuator is on, the attenuation value is added to these
figures (for example, for 10 dB attenuation, the minimum displayed signal level
will be -140 dBm and the maximum level will be +10 dBm).
The Color index, i.e. the sequential number of the corresponding line in the
palette related to a particular input signal strength (SS) will be calculated using
a linear interpolation formula:
palette related to a particular input signal strength (SS) will be calculated using
a linear interpolation formula:
Color_index = 255 * (SS - min_SS) / (max_SS - min_SS)
(All signal strength values are in dBm.)