In the late 1920s, Cai Zekang, from a prominent Ningde family, moved to Shanghai to study at Tongji University while secretly seeking Communist Party connections. After confirming his hip, he adopted the alias Cai Wei and was tasked with establishing a radio station in the Eyuwan Soviet area. There, he set up communications for the Red Fourth Front Army and trained new operators, using his mathematical skills to provide vital intelligence that ed the Red Army's efforts during a critical period.

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