. Bell telephone magazine . /•>^,^r>Jf. Diagram h. Representing by analogy the frequency transformation and trans-mission of Type-K carrier channels, this diagram illustrates the explanation which begins on the opposite page tually done for the equipment usedto build the speech bridge acrossChesapeake Bay. To obtain radio assignments withwidth great enough to accommodatethe twelve telephone bands corre-sponding to the blocks A to L in-clusive, it was necessary to employvery high frequencies, even higher as represented by blocks A to L, ex-tending from 12,000 to 60,000 cyclesper second, a
. Bell telephone magazine . /•>^,^r>Jf. Diagram h. Representing by analogy the frequency transformation and trans-mission of Type-K carrier channels, this diagram illustrates the explanation which begins on the opposite page tually done for the equipment usedto build the speech bridge acrossChesapeake Bay. To obtain radio assignments withwidth great enough to accommodatethe twelve telephone bands corre-sponding to the blocks A to L in-clusive, it was necessary to employvery high frequencies, even higher as represented by blocks A to L, ex-tending from 12,000 to 60,000 cyclesper second, and to control (or modu-late) the radio carrier with thisgroup all at once. Currently, radioassignments in this region are on thebasis of a band width of 150,000 cy-cles per second for a single communi-cation channel, but by this system 38 Bell Telephone Magazine SPRING twelve voice communication channels With information of the nature have been put into this same band outlined roughly above, but of course width, representing an enormous con-
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
