The Bell System technical journal (1922) (14569328258)

Identifier: bellsystemtechni18amerrich (find matches)

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

Text Appearing Before Image:

^t^^-j ,£iK- Fig. 4—Antenna, meter, and range switch. extending from 0 to 5000 feet and the lower 0 to 1000 feet. Theposition of the range switch determines the scale to be used in readingthe meter. Figure 5 shows an assembly of the various units located approxi-mately as they would be installed in an air transport. The trans-mitter, power unit, receiver and a junction box are installed in thebaggage compartment just aft of the cockpit with cable connections A TERRAIN CLEARANCE INDICATOR 231 o H CD £D 5 Z LU ^ O Z 5 If) cr. > X Z W Q) a. < :S <j »-, q: O tu !iJ < D h- Q. EC 5 CC --1 ij) u < m o Q LU u. U)

Text Appearing After Image:

b 232 BELL SYSTEM TECHNICAL JOURNAL to the airplane battery and to the meter and range switch on theinstrument panel. The transmitting antenna is shown below thewing to the left of the engine nacelle and the receiving antenna to theright of the other engine nacelle. Coaxial transmission lines connect-ing the antennas to the transmitter and receiver, respectively, areindicated by the lines extending through the wings from the antennas.It was necessary to exaggerate the size of some of the units in order tomake them large enough to see in the diagram. The installation with apparatus as pictured in Fig. 3 weighs com-plete with all cables and connections about seventy pounds. Sincethe equipment shown in the pictures represents a working model builtwith the idea of attaining performance rather than minimum weight,undoubtedly some reduction in weight will be obtained in futuremodels. The antenna installation shown utilizing half-wave dipole typeantennas approximately a quarter wave-length b

the bell system technical journal 1939 book illustrations history of technology electric power engineering american telephone and telegraph company transmitter radio images from internet archive

1922

Prelinger Library

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public domain