Sergey, UR6QW is a ham radio operator in Ukraine who designs and builds excellent audio devices for ham radio operators. I have been a fan of Sergey’s work for years. read more…

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About AD5GG
AD5GG works in the real world as an RF design engineer in the UHF (300 MHz - 6 GHz) range. Occasionally, he posts articles on this very site. Sometimes they're even worth reading.