| 2. | PSK31 | ||
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a digital mode of transmission used by Amateur Radio Operators I interfaced my computer to my high-frequency (HF) transceiver and now I operate PSK31 from my keyboard.
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| 1. | PSK31 | ||
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A digital transmission mode -- Phase Shift keying with 31.25 baud rate PSK31 is one of the better HF operating digital modes.
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