As someone mentioned before, the 27 days rotation seems to work. I worked 21 JA stations on january 13 and haven´t heard any other JA untill I worked again 20 JA stations on february 11, that makes 28 days difference. Since that date, I have only barely heard (and worked) 1 JA station, JF7DFA. So let´s wait for march 10-11th, the 27 days solar rotation..! Josep EA6BF