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The author presents field test results on real-zero single-sideband (RZ SSB) technology carried out over a HF radio channel. The purpose of conducting field tests was to clarify whether the RZ SSB technology can be satisfactorily adapted for HF data communications. During the tests, bit error rate (BER) performances of the RZ SSB were investigated first with an ITU-T Recommendation V.29 modem with bit rates ranging from 2.4 kbit/s to 9.6 kbit/s. Successful results for BER performance led to JPEG/text file transmissions using a facsimile modem as well as the RZ SSB transceivers. Throughout testing, JPEG/text files were transmitted and received with perfect quality even through an HF simplex radio channel between two coastal stations approximately 2000 km apart after completion of normal transmission. Detailed reports on both JPEG/text files and BER transmission performance are given. In conclusion, it appears that the RZ SSB technology can certainly be adapted for HF data communication, and further it is proved that it is superior to conventional SSB technology.