Have you tried the JT65A?

Have you tried the JT65A amateur radio Digital mode?

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About JT65

JT65 is one of the weak-signal digital modes supported by WSJT, an application written in 2001 by Joseph Taylor K1JT, astrophysicist and Nobel Prize in Physics, and released as open source in 2005.

Want to learn more ? read our article: How to get on the air with JT65A