Grayline v1.2 helps radio amateurs and shortwave listeners to benefit
from so called 'grayline propagation'. The grayline is a virtual line
which divides the earth in the day and the night side. When one radio
station 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 HF bands. Grayline propagation occurs in
general from about 1.8 to 10 MHz and the propagation paths will be in
the dark. Grayline v1.2 calculates possible grayline propagation paths
for your location to other DXCC countries for any given date.

Special requirements: None.

Freeware. Uploaded by the author.

Folkert Geurink, PA3CQR
geurink@iri.tudelft.nl


------------------------------