Reprint of Sections On Wireless Telegraphy And Wireless Telephony From Practical
Reprint of Sections On Wireless Telegraphy And Wireless Telephony From Practical
Robert Andrews Millikan
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460. A series of wave trains of the gaps between the wave trains would render the language unintelligible. Theoretically the voice could be transmitted by continuous electromagnetic waves having the frequencies of voice vibrations, but such a method is entirely impracti- cable on account of the enormous length of aerial needed to produce such long waves and the tremendous amount of power which would be required. Therefore, the only satis- factory method thus far developed is to transmit speech ...FIG. 461. Continuous, or carrier, waves of radio frequency on continuous, or " carrier, " waves (Fig. 461) having a frequency (radio frequency) above the limit of hearing. At the sending station the continuous waves (Fig. 461) are " modulated " by the voice at the transmitter ; that is, the sound waves of the voice act upon the apparatus in such a way as to alter the otherwise uniform amplitude of the series of continuous waves (Fig. 462). These "modulated" con- tinuous waves on reaching the aerial of the receiving station produce corresponding oscillatory currents in the wires of the * The pupil should master 374, 375, 376, 485, 486, 487, and 488 before reading the six sections following.
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