It appears to be a Morse code transmission from an amateur radio operator.

Here's a breakdown of the text:

* "00:33" indicates the time of day (in military format).

* "JQ2DUX/2" is the call sign of the transmitting station, which can be broken down into:

+ "JQ" is a country code for Japan.

+ "2DU" is the station identifier within Japan.

+ "/2" indicates that this is a portable station or a station operating at half power (i.e., not a full-power station).

* "on JP-1921(Aichi KenminnoMori Prefectural Park, JP-AI)" refers to the location of the transmitting station:

+ "JP" again indicates Japan.

+ "19" is likely an identifier for Aichi Prefecture (Japan has a system for identifying prefectures with two-digit codes).

+ "21" may be another code or identifier specific to the park or region.

+ "(Aichi KenminnoMori Prefectural Park)" is the full name of the location, which appears to be a park in Aichi Prefecture (the kanji characters for ""Kenmin no Mori"" mean "people's forest").

* "21055 CW QRT" indicates the operating mode and status:

+ "CW" stands for Continuous Wave, indicating that the station is transmitting Morse code.

+ "QRT" means that the transmission has ended or is shutting down.

* "[JQ2DUX]" is a repetition of the call sign, enclosed in square brackets.

So, this text appears to be an announcement by an amateur radio operator (JQ2DUX) operating from Aichi KenminnoMori Prefectural Park in Japan, transmitting Morse code on a specific frequency (21055 Hz), and now shutting down the transmission.