When my second trip to Kangaroo OC-139 was announced on internet in February 2014, I’ve received few messages from various countries (including Russia) with a common refrain - "Hmmm… almost everyone has got the Island confirmed for so long now, and few who hasn’t - worked with you in the first trip.
The call sign OK4MM appears from time to time on this DX News portal, as well as on some other DX related web pages, mostly announcing activities from islands of the IOTA programme.
Presentation covers radio technology development from the Maxwell's mathematical description of electromagnetic waves in 1860-1865, Hertz's development of a crude spark transmitter and spark receiver that proved the existence electromagnetic waves in 1886-1888
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