Extra exam question E3C09

WhyAmateur radio propagation reporting networks report the digital-mode and CW signals participating stations actually decode and hear. Amateur radio propagation reporting networks, like PSKReporter, the Reverse Beacon Network, and WSPRnet, work by having participating stations automatically decode and report the digital-mode and CW signals they actually hear, building a real-time picture of what propagation is doing, answer D. They aren't measuring solar flux, electric field intensity, or magnetic declination directly, those are separate categories of space-weather and geophysical data.