A Carrier Telephone System for Toll Cables

Green, C. W.; Green, E. I.

doi:10.1109/t-aiee.1938.5057804

Trans. Am. Inst. Electr. Eng.

1938

DOI: 10.1109/t-aiee.1938.5057804

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A Carrier Telephone System for Toll Cables

C. W. Green

E. I. Green²

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1940

1956

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Cited by 17 publications

References 13 publications

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Manufacture of Quartz Crystal Filters

Burns¹

1940

Bell System Technical Journal

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Quartz crystal filters used in modern carrier systems present new problems in manufacturing technique. In the assembly and testing of the filters and in the production of component crystals, coils and condensers, special factory facilities are required for accurate measurement of frequency and control of atmospheric conditions. The manufacture of quartz crystal plates in particular combines several fields of applied science, including crystallography, precision grinding, vacuum technique and high frequency electrical measurement. Inductance coils and fixed and variable condensers for use in crystal filters must consistently meet advanced requirements, especially in regard to stability. The assembly of these components into filters resembles the manufacture of radio receivers, differing mainly because of smaller quantity requirements. Testing equipment must permit rapid shop adjustment and test of the completed filters with laboratory precision.

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Manufacture of Quartz Crystal Filters

Burns¹

1940

Bell System Technical Journal

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Pulse-time-modulation terminals for music transmission over radio links

Rous¹

1956

Proceedings of the IEE - Part B: Radio and Electronic Engineering

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Co-ordination of power and communication circuits for low-frequency induction

Coleman¹,

Trueblood²

1940

Electr. Eng.

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A Carrier Telephone System for Toll Cables

Cited by 17 publications

References 13 publications

Manufacture of Quartz Crystal Filters

Manufacture of Quartz Crystal Filters

Pulse-time-modulation terminals for music transmission over radio links

Co-ordination of power and communication circuits for low-frequency induction

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