This appears to be a log entry from a ham radio operation.

Here's a breakdown of the information:

* `02:30`: The time of day when the contact was made.

* `JQ2DUX/2`: The call sign of the station that was operating. The `/2` indicates that they were operating with an antenna gain of 2 (i.e., doubled).

* `on JP-1457`: The station's location, which is a specific grid square (JP-1457) in Japan.

* `(Sakurabuchi Prefectural Nature Park, JP-AI)`: The exact location where the contact was made. Sakurabuchi Prefectural Nature Park is a park located in Aichi prefecture, Japan. The `(JP-AI)` indicates that this is within grid square JP-1457.

* `7002.0 CW QRT`: The frequency of the contact, which is 7020 kHz (kilohertz) on a continuous wave (CW) mode. The `[JQ2DUX]` at the end suggests that this is a confirmation or receipt of the transmission from JQ2DUX.

In summary, this log entry indicates that a ham radio operator with call sign JQ2DUX made contact with another station at 02:30 on frequency 7020 kHz CW, and was operating from Sakurabuchi Prefectural Nature Park in Aichi prefecture, Japan.