description : Chinese Military HF Communications 11032 KHz USB as received in Darwin Australia on the 23rd of July 2023. The data mode at the beginning could possibly be MIL-STD-188-110 Serial, and the MFSK data bursts in the middle of video are MIL-STD-188-141A Automatic Link Establishment (2G ALE). The HF radio operator is speaking Chinese language and saying 接电话请回答 and 收到请回答 which roughly translates to "If you can hear this, please answer the telephone". Received via an Airspy HF+ Discovery software defined radio and a center-fed dipole.
https://www.youtube.com/watch?v=qK4x8raYzAk
https://www.youtube.com/watch?v=qK4x8raYzAk
https://www.youtube.com/watch?v=qK4x8raYzAk
https://www.youtube.com/watch?v=qK4x8raYzAk