The history of Japanese call signs is a little be complexe, specially the asignations after WW II. There is a big clarification in the following website I recommend you visit: Ryota Motobayashi JJ 1WTL
- After WWII the Allied Forces can use the callsing J#nnn (i.e. J2AAA) as you can see in the Japan J#nnn Gallery.
2. In 1.1.1949 the J#nnn calls were replaced by JA#NN (i.e. JA2OA, JA2BI an others) as you can see in the Japan JA Gallery.
3. In june 1950 were replaced again, this time the JA#nn by the KA@nnn as you can see in the Japan KA#nnn Gallery.
4. From the end of the WWII until 1952 the only radio amateurs in Japan were the Allied Forces operators. Was in that year, 1952, the start of the Japanese cititcens operations using the JA#nn
Here you can find the QSLs of the Allied Forces operators showed in the gallery:
JA2AO, JA2AV, JA2AZ, JA2BI, JA2BJ, JA2BQ, JA2CC, JA2CD, JA2CK, JA2CL, JA2CW, JA2DD, JA2GA, JA2IM, JA2JJ, JA2KG, JA2KW, JA2RO, JA2TJ
JA7AF, JA7RV, JA7RW