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WSJT-X version 2.1.0-rc5 – introducing the FT4 Protocol for Digital Contesting – Mac Ham Radio
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FT4 - New Digital Mode Designed for Contesting
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EI7GL....A diary of amateur radio activity: New FT4 protocol hits the airwaves
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FT4 Frequencies
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FT4 – Nuova modalità digitale progettata per il contest – Club D-Star Zona 8 – Antonio IU8CRI
FT4 - Signal Identification Wiki
FT4 Mode - faster than ever - YouTube
The AMSAT Journal May-June 2020 FT4 – FlexRadio
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FT4 vs FT8 - A new Ham Radio mode, what's the difference? - YouTube
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FT8 and FT4 Digital Modes For Amateur Radio
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