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V4 and H4 are narrow band sound card digital FEC and ARQ protocols optimized for keyboard operation over high frequency Ham radio. They both uses 4FSK modulation and strong FEC encoding for robustness even in weak signal or poor propagation conditions. H4 and Chat (now in beta testing) is a new imrpoved version with lower latency and higher throughput. Both V4 and H4 can be implemented on most computers using standard PC sound cards with radio interfaces. These are Windows programs but will also work on a Mac with Parallels or VMWare.
- Amateur and Ham Radio
- Dec 1, 2010
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