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Datei:Image from page 636 of "The Bell System technical journal" (1922) (14569539429).jpg

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Identifier: bellsystemtechni19amerrich Title: The Bell System technical journal Year: 1922 (1920s) Authors: American Telephone and Telegraph Company Subjects: Telecommunication Electric engineering Communication Electronics Science Technology Publisher: [Short Hills, N.J., etc., American Telephone and Telegraph Co.] Contributing Library: Prelinger Library Digitizing Sponsor: Internet Archive

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Text Appearing Before Image: od at Panama, and in September a one-way demonstration wasmade across the continent, receiving at San Francisco. Within a fewdays speech was heard in Honolulu and then in Paris. The tests RADIO EXTENSION LINKS TO TELEPHONE SYSTEM 613 showed that transoceanic telephony was possible and indicated someof the difficulties that had to be overcome. The radio transmitter in these tests deserves a few words becauseof its novelty and because in one respect it has never been equaled.The carrier was modulated at a relatively low level and then amplified.The final stage of amplification contained 550 tubes in parallel whichin number appears to be an all time record. Each tube was capable ofdelivering only 15 or 20 watts peak h.f. power which would give apower rating on a telephone basis of about 2^ kw. With these tests completed, transoceanic telephony withdrew intothe laboratory for almost eight years while further intensive workwas carried out. The second step in public occurred in January 1923

Text Appearing After Image: Fig. 1—The first transoceanic radio telephone circuit opened forcommercial use January 7, 1927. when a second transoceanic test was made. A 200 kw. single sidebandtransmitter had been constructed and installed at Rocky Point, LongIsland, while engineers with receiving equipment journeyed to London.A demonstration was given to government engineers and to newspaperreporters over there to show that practical transoceanic telephonywas possible and to interest them in constructing a return circuit.The British government was interested and with our assistance tookup the matter of providing a transmitter and receiver for their end.Three years were required for this third step and in February 1926the first two-way radio telephone conversations were held between theUnited States and England. Commercial service opened in January1927. See Fig. 1. 614 BELL SYSTEM TECHNICAL JOURNAL With the first transoceanic circuit estabHshed, further circuitsfollowed rapidly. For a number of years prior to 19

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