I have responded to the call of PE4BAS to turn on WSPR on 80 meters for the night. Soon I saw Bass and Julian G4ILO on my screen. That's always fun to see and hear friends known by radio. The usefulness of WSPR is particularly propagation purposes. I was curious about the signal fluctuations during the night. The advantage of PE4BAS is that he lives relatively close to me (164.9 km / 102.5 mi) and I received almost all his transmission cycles. Bas was running 1 watt on 80 meter.
This was not the case with G4ILO Julian's signal. I assume he has all night broadcast. But I miss some transmissions between 4 and 5 o’clock UTC. I think his signal is below the -30 db. This does not properly reflect the graph. It was unfortunate that no ZL and VK stations were QRV. What is not QRV cannot be heard. Based on the graph of PE4BAS I can determine the best propagation is around 23 hour UTC and in the early morning (grey zone) which of course was already known. It makes no sense to come out of your bed in the middle of the night for DX-ing on 80 meters. After 5 o’clock UTC it will be interesting again.