Grayline 1.2 Description:

Grayline calculates the possible grayline propagation paths for a given day of the year. It calculates your sunrise and sunset time and looks in the DXCC table for countries which are on the opposite grayline.

The grayline is a virtual line which divides the earth in the day and the night side. When 1 radiostation is in the dusk and the opposite station is in the dawn, there is a possibility for so called 'grayline propagation'.

At sunrise the D-layer builds up slowly and at sunset it disappears slowly again. During this change, low frequencies are not absorbed but refracted by the D-layer and they will enter the F-layer with a much lower wave angle than normal. In this way longer distances can be used for propagation on the lower bands. Grayline propagation occurs in general on the 1.8, 3.5, 7 and 10 MHz bands and the paths will be in the dark.

Grayline security information

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