Looks like a classic case of a YunHai-1 intrusion:
These are three Chinese satellites transmitting on 1704 MHz with a massive bandwidth and unusually high power (will be clearly visible even on an omnidirectional antenna).
Data is said to be encrypted. Check your observation time against Yunhai 1-01 [41857], Yunhai 1-02 [44547] and Yunhai 1-03 [53877].
FengYun-3A and 3B are both inactive, and 3C only transmits when in view of China. I’m not aware of anything else that could produce this kind of signature.