Sunday, July 16, 2017

Versatile charts for Reliability, Signal Power and MUFday available at VOACAP Online P2P

I am happy to report that another way of visualizing three critical output parameters for HF propagation predictions at the VOACAP Online Point-to-point service is now available. These charts, namely Reliability (REL), Signal Power (S DBW) and MUFday, can be viewed at by clicking on the "Tri-graph" button.

Each chart offers multi-colored line graphs for all frequencies from 80 meters to 10 meters. And thanks to the JavaScript framework (plotly.js) used for plotting these graphs, they can all be toggled on and off by clicking on the legend values on the right, which helps the user focus on relevant graphs only. Also there are versatile tools that allow you to save the graph as PNG, zoom in/out, compare results data on all frequencies on mouse hover, pan the chart, and more.

The REL and MUFday data is presented as percentages from 0 to 100 (%) whereas the Signal Power (S DBW) data is shown as dBW values from -163 to -103. The value of -163 is an extremely low noise value of my own choosing, and the next value of -157 represents a median S-meter reading of S0. The value of -103 corresponds to a median S-meter reading of S9. The steps are 6 dB or one S-meter reading step.

On the Signal Power graph, the Y-axis values span from -163 dBW (noise level) to -103 dBW (S-meter reading of S9).
The toolbox with many useful functions such as saving the graph as PNG (far left).

Hope you enjoy the new charts!

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