2009/10/11 James Moritz <[email protected]>
Dear Gary, LF Group,
This is what the signal looks like for about 11/2 hours up to 2200utc. The red
signal is G4WGT, the yellow one is G4JNT's WSPR beacon. The blue line is the
noise level scaled to about 300Hz bandwidth, to give an idea of the audible
strength as a CW signal. The plot settings are not ideal to show variations in
signal level - there are actually short periods where the signal fades to
inaudibility that don't show up here, but it gives a reasonable idea.
G4WGT I think must be mainly sky wave here so presumably the fading is due to
different sky-wave paths. G4JNT is a very stable ground wave signal
here during the day, so I imagine the fading here is due to the combination of
ground wave and sky wave.
Cheers, Jim Moritz
73 de M0BMU
