. The Bell System technical journal . ations. Since the installations at main stationshave been made in existing voice frequency repeater offices, the avail-able power plant is used to furnish filament and plate current for theamplifier equipment. The input and output sealed test terminal bays with a high-fre-quency transmission measuring bay have been installed adjacent toeach other to form a five-bay unit for testing and patching purposes. Line amplifiers for each direction of transmission have been groupedtogether in adjacent relay rack bays. Each bay has a capacity of 20amplifiers, except
. The Bell System technical journal . ations. Since the installations at main stationshave been made in existing voice frequency repeater offices, the avail-able power plant is used to furnish filament and plate current for theamplifier equipment. The input and output sealed test terminal bays with a high-fre-quency transmission measuring bay have been installed adjacent toeach other to form a five-bay unit for testing and patching purposes. Line amplifiers for each direction of transmission have been groupedtogether in adjacent relay rack bays. Each bay has a capacity of 20amplifiers, except the first, in which is mounted the test amplifier as-sociated with the high-frequency measuring system and 19 line ampli-fiers. Associated with the line amplifiers are the flat gain mastercontrollers and power supply and cable balancing equipment. Aschematic arrangement of circuits in a flat gain repeater office isshown in Fig. 15. Repeater offices giving both flat and twist gain regulation have been 572 BELL SYSTEM TECHNICAL JOURNAL. fe ^ APPLYING CARRIER TELEPHONE SYSTEMS 573
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
