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Regenerative RepeatersRepeaters for neutral, or single-current, telegraph systems were discussed early in this chapter. Repeaters are also used on circuits operated by printing telegraph equipment. In addition to increasing the signal strength, the repeaters reshape the signal to compensate for distortion, and longer transmission distances are possible. This reshaping is accomplished by regenerative repeaters, defined2 as "a telegraph repeater which receives mechanically sent, electrically transmitted signals and resends them in substantially perfect form." Where circuits are composed of a number of repeater sections, the distortion of each section is cumulative, and a point is reached where distortion alone limits the transmitting distance. The regenerative repeater eliminates distortion and strengthens the line current by using a small part of the middle portion of the received impulse to determine the nature of the outgoing regenerated signal. The relation between the distorted received signal and the corrected impulses in one system is indicated in Fig. 16.
Regenerative telegraph repeaters are of several types, including repeaters operating on the non-rotary, rotary, and electronic principles 15,25,26,27,28,29,30
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Last Update: 2011-05-30