reasons
1) very much possible that TX power was set incorrectly.
2) 1kW is very rare in Japan
2017-02-22 04:36 JA5NVN 7.040175 +9 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315
2017-02-22 03:24 JA5NVN 7.040175 +8 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315
2017-02-22 02:52 JA5NVN 7.040175 +6 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315
2017-02-22 01:40 JA5NVN 7.040174 +7 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315
2017-02-22 01:30 JA5NVN 7.040175 +9 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315
2017-02-22 00:52 JA5NVN 7.040174 +10 0 PM74ec +60 1000.000 JI1KBF PM95to 507 315