The above graphs show the strength of reception on short wave test from 5SW in the various countries mentioned. The time indicated in the bottom line throughout is Greenwich Mean Time.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280413.2.2.3
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Radio Record, Volume I, Issue 39, 13 April 1928, Unnumbered Page
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31The above graphs show the strength of reception on short wave test from 5SW in the various countries mentioned. The time indicated in the bottom line throughout is Greenwich Mean Time. Radio Record, Volume I, Issue 39, 13 April 1928, Unnumbered Page
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