WSJT‑X (JT65A mode)

WSJT‑X is a suite of amateur‑radio software tools for weak‑signal digital communication, developed by Joe Taylor (K1JT) and the WSJT Development Group. It implements several digital modes (including JT65, JT9, FT8, and others) specifically designed for making reliable contacts under very low signal‑to‑noise conditions. JT65A is a sub‑mode of JT65 commonly used on HF bands for short, structured exchanges between stations.

The program handles signal decoding, encoding, and the precise timing need...