It seems like you've shared a message from a amateur radio operator's log or chat.

Breaking it down:

* `07:53`: Time of the message.

* `7M3DUU/P on JP-1177(Arakawa Oaso Prefectural Park, JP-ST)`: This appears to be the call sign and location of the amateur radio operator. The "P" likely indicates that they are operating portable (i.e., not from their home station).

+ "7M3DUU" is the amateur radio call sign.

+ "JP-1177(Arakawa Oaso Prefectural Park, JP-ST)" suggests that the operator is located in Japan, specifically at Arakawa Oaso Prefectural Park, within the JP-ST (or possibly ST?) zone or region (I couldn't find specific details on this).

* `24915.0 FT8 QRT`: This line seems to be about the communication mode and status.

+ "FT8" is a digital amateur radio protocol that allows for efficient and robust data transmission over short to medium distances, especially useful in low-power and high-noise environments like HF bands.

+ "QRT" indicates that the operator has stopped transmitting (i.e., gone quiet).

* `TNX! [7M3DUU]`: The final message expresses gratitude or appreciation for something (the specific context isn't clear from this snippet), attributed to the call sign holder, 7M3DUU.

Without more information about the context of these messages, it's hard to deduce a lot. Amateur radio communications often involve reporting positions and modes used during operations, especially when using digital modes that require some setup or coordination, like FT8.