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. The principles underlying radio communication . than 10,000 meters—that is, tofrequencies less than 30,000 cycles per second—and is thereforeprimarily of use for long-distance work. Frequencies as high as200,000 cycles have been obtained, however ...
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The principles underlying radio communication . Fig. 122.—Motor-generator set of Fig. 121 partly dismantled. 1. Motor brushes. 2. Motor field windings. 3. Motor field poles. 4. Motor field joke. 5. Terminals
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