Low-Noise Ultralinear Line Repeaters for the L5 Coaxial System

Abstract

Abstruct-Two major characteristics of the coaxial cable that are of paramount importance in the design of coaxial line repeaters are the nominal cable loss and the variation in the cable loss due to seasonal variations in cable temperature.As a result, there are two types of line repeaters used to equalize for the cable loss characteristics. One is a low-noise ultralinear fixedgain amplifier. It is designated the basic repeater and is used to equalize for the nominal loss of the coaxial cable. The second type, called the regulating repeater, includes a basic repeater plus additional circuitIy which automatically corrects for dynamic variations in cable loss due to temperature.Some of the important design techniques that are used to achieve these low-noise ultralinear repeaters are described. In addition, ananalysis of the steady-state response of a tandem string of regulating repeaters is included. Paper approved by the Associate Editor for Wire Communication of the IEEE Communications Society for publication after presentation at

The Design of Repeatered Lines for Long-Haul Coaxial Systems

“…This is accomplished continuously in what is designated a regulating repeater. These repeaters contain the maximum level deviations due to the cable-temperature effect to about k2.5 dB through the use of preequalization and postequalization methods [ 6 ] . When the system has been properly aligned, the preequalizer in one regulating repeater and the postequalizer in.…”