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subjects: Elektronik,  Electronics,  Amateur radio,  Electronic circuits,  Electronic circuit design,  Shortwave radio,  Radio circuits,  Radio,  Receivers and reception,  Radio frequency,  Telecommunication,  Telecommunication systems,  Transmitters and transmission,  Modulation (Electronics),  Radio frequency modulation,  Radio detectors,  Design and construction,  Analog electronic systems,  Amateurs' manuals,  Handbooks, manuals,  Electric Oscillators,  Frequency synthesizers,  Communication Engineering