Dear Alan, Jim,

over the 420km G4JNT-OR7T path there is a +/-20dB day/night difference

73, Rik  ON7YD - OR7T

Quoting James Moritz <[email protected]>:

Dear Alan, LF Group,

G3NYK wrote:

Generally at LF the skywave starts to equal or exceed the
groundwave strength at ranges exceeding 700km. It may be a little less
that
that at 500k.

...And yet, when I watch the signal level of G4JNT's WSPR beacon at night, I
see short duration deep fades of 20 - 30 dB quite often, and sometimes
enhancements over the daytime level of several dB also. During the day, the
signal level shows very little variation. So even at a distance of about
120km, it would seem the ground wave an sky wave strengths must be
comparable, in order to produce the fades.

Cheers, Jim Moritz
73 de M0BMU