Yesterday we had a 4-hour "Verbose SNR" session on 15m VK3 to 9V1 (S'pore).
It would have probably continued but the noise-level in urban Singapore increased in the evening hours due to domestic appliance radio noise emissions. The SNR graph clearly shows the SNR in S'pore (blue) deteriorating after about 10:00 UTC. (The law of reciprocity implies that for equal power levels at both stations, the average signal levels at both ends are the same.)
This session is a good example for the robustness of VarAC HF links.
Anyone with a longer "Verbose SNR" session please ?