A ham radio transmission!

Here's a breakdown of the information:

* `09:12`: The time of day in 24-hour format.

* `JJ1HHJ/1`: The call sign of the ham radio station. In this case, it's JJ1HHJ (the main call sign) / 1 (a suffix indicating that this is a substation or an alternate frequency for the main station).

* `on JP-2038`: The location where the transmission is taking place, which is Imperial Palace Outer Garden National Government Park in Japan. JP-2038 is likely a reference to a specific grid square or geographic location within Japan.

* `(Imperial Palace Outer Garden National Government Park, JP-TK)`: A parenthetical note indicating the exact location of the transmission.

* `433260 FM FM agn[JJ1HHJ]`: The frequency and mode of the transmission.

Here's what we can deduce from this information:

* The ham radio station JJ1HHJ is transmitting on a specific frequency (433.260 MHz, which is likely an amateur radio frequency allocated by the Japanese government).

* The transmission is taking place on FM (Frequency Modulation) mode.

* The `agn` prefix suggests that this is a "aggain" or re-transmission of a previous signal, possibly from another station.

* The `[JJ1HHJ]` suffix indicates that this transmission is related to the JJ1HHJ call sign.

Note: This is just an example of how ham radio transmissions can be decoded and understood. If you're not familiar with amateur radio operations, it might seem like a cryptic message!