Advertisement: Bell Telephone System 1885 - 1935 FIFTY YEARS

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The zig-zag antenna is a suitable choice because it has a 60° beamwidth gain of more than 13 dB, and in the UHF band its dimensions are convenient (e.g., 1.8 0.4 m) for rapid installation. This sampling period is fixed by the ShannonÕ s sampling criterion, which states that the sampling frequency must be at least double the highest frequency to be transmitted. Un telefon este compus dintr-un emiţător, un receptor şi un disc sau un mecanism dotat cu butoane pentru formarea numerelor. 8.

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Publisher: National Geographic (1936)



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