A radio transmission in a format that appears to be used by amateur radio operators. Here's a breakdown of the message:

**04:14**: The time of transmission (HH:MM).

**JR4ARN/P**: The call sign of the transmitting station, indicating it is an amateur radio operator in Japan with the prefix "JR" and suffix "4ARN". The "/" indicates that the station is operating portable (P), possibly from a temporary location.

**JP-1612(Kurashiki Sports Prefectural Park, JP-OY)**: The grid square of the transmitting station's location. In the amateur radio community, grid squares are used to identify locations and facilitate communication between operators in different areas. "JP" indicates Japan, and "1612" is a specific grid square.

**7043 FT8**: This appears to be a transmission mode or protocol (in this case, FT8). The number "7043" might indicate the transmit frequency (e.g., 7043 kHz) or some other parameter. FT8 is a digital mode used for weak signal communication, particularly in VHF and UHF bands.

**QRT**: An abbreviation for "quiet, resting, transmitting". This indicates that the operator has finished their transmission.

**TNX**: An abbreviation for "thanks" or "thank you".

**QSO CU AGN[JR4ARN]**: A response to a previous contact (QSO) initiated by JR4ARN. In amateur radio lingo, a QSO is an exchange of information between two operators, typically involving a greeting, confirmation of the other's call sign, and possibly some further conversation. "CU" likely means "see you", and "AGN" might be a message or response from the receiving station (in this case, probably another amateur radio operator).