What unusual cndx tonight...Feb 7 1130/1250z. All USA signals had strong QSB on them going from an S9 to nil. I found the reason was that the path kept on changing..... switching from a South-east to North-east and back again. I had to keep on switching beverages to try and keep up. Pleased to get 50 USA QSO's in the log. 73 Mike Vk6HD