The top of the graphing window displays a red graph that shows the number of messages per minute, to serve as a rough indicator of how good conditions are. You can see a very obvious diurnal pattern of low readings in the daytime that increase as darkness approaches, and DX stations start appearing.
I thought it might be interesting to modify the display to take into account the distance to each station's message received during that minute, rather than just a sum of the number of messages, that is to more heavily weigh more distant stations. I present four graphs below. The first one is the software as it is now, each message is weighted the same. The next three have different weights, the first is the square root of the distance to the station, the second is the distance to the station, the third is the square of the distance. The effect of each is to increase the dynamic range of the graph, to make the nighttime peaks larger. My hope is that this would make it easier to compare this metric to various propagation indices, in the hope of finding some that correlate with propagation on the DGPS band.
What do folks think?
square root of distance: