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- Amateur Radio History
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DX is an early telephone term for distant exchange.
Amateur Radio History
It is also defined in Funk & Wagnall's as Distance.
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Persian Army employs a relay system where soldiers positioned on hilltops shout and relay military messages 30 times faster than by runner.
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Accounts of flags, mirrors and smoke snals appear in early history. By 1837 the system is improved and was demonstrated using 'lhtning wires' and 'Morse code,' an electronic alphabet that could carry messages. A line was constructed between Baltimore and Washington and the first message, sent on May 24,1844, was 'What hath God wrought!
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