Abstracts of Technical Articles by Bell System Authors (01 October 1948)

Ments employing frequency division techniques by which the telephone message-carrying potentialities of the coaxial cable system are realized. By these methods 480 high quality telephone messages are prepared for 1 2 3 Trans. A. I. E. E,vol. 66, 1947 (pp. 895-899). Trans. A. I. E. E., vol. 66, 1947 (pp. 792-796). Trans. .-1. /. E. E., vol. 66, 1947 (pp. 1451-1459). 747 748 BELL SYSTEM TECHNICAL JOURNAL transmission over the line and restored to original condition at main terminal points. At intermediate points appropriate groups of channels may be removed, inserted, bridged, or relocated in the frequency spectrum of the line. Experimental Studies of a Remodulating Repeater.4 W. M. GOODALL. This paper describes tests made on an experimental broad - band microwave f.m. repeater. 

A superheterodyne receiving unit is used with a microwave reflex-oscillator transmitting unit to form a repeater. An experimental set up for testing this repeater in a circulating-pulse system is described. Oscillograms showing the performance of the repeater on a multilink basis are discussed. An Electronic Regenerative Repealer for Teletypewriter Signals.6 R. B. HEARN. The important factor in teletypewriter signal transmission over circuits is the relative position on a time scale of the code pulses. If this timing is preserved, wide amplitude variations can be experienced without errors resulting.