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June 13, 1931
TELEVISION PEM/JT EECOMGNLED
The p.pplicstion of Don Lee, Inc, L^s Angeles, Calif, for experimental tele¬ vision construction permit was recommended this week in a report submitted to the Commission this week by Examiner Walker. The application requests authority to use the frequency of 2100 to 2200 kc with 500 watts power and unlimited time.
The Examiner makes the following findings concerning the proposed system and its possible a^'v^ntages from r technical standpoint:
•’The system of television broadcasting which the applicant proposes to use differs from the usual television system in that it does not employ scanning disks or other rotating devices, being an electrical system, of scanning rather than a mechanical system.
"In the proposed apparatus, motion picture film is moved uniformly through a modified projector to provide the image for transmission. Simultaneously with this .motion, ant^ in a direction transverse to it, a beam of light is vibrated across the film, according to a. peaked waveshape of energy, by an oscillograph type of element. The light transmitted through the film impinges upon a photo¬ electric cell, producing current varietions in it which are amplified and modu¬ lated on to a radio frequency carrier in the usual manner.
"a peaked-wave scanning generator, a vacuum tube device, is used to excite the oscillograph element at a frequency of 1200 cycles per second, giving an image of 80 lines, which is repeated 15 ti.mes per second.
"The applicant beliex'es that the peak scanning wave gives more useful detail in the received image than is usually secured when a fixed frequency spectrum, such as the 100 kilocycle channel, is used,
"'The receiver employs a cathode-ray oscillograph tube for forming the image, instead of the customary scanning disk or dru.m. A peaked-wave generator ident¬ ical to and operating in synchornism with that used at the transmitter, or peaked voltage waves sent over a line from the transmitter, are used at the receiver,"
>7WL aND KjVEH ask FULL TIME
Station ih?L, New Orleans, La. and Station KWKH are both seeking unlimited time on the cleared channel frequency of 850 kc in a hearing held before Examiner Pratt this week. The New Orleans station claimed that it is in a position to render a far superior service to the listeners in that area, than is Station lUTICII. Both stations are asking for increases in operating power. The original hearing was held, in these cases on September 22 and 23, 1930, and the cause was remanded for the taking of further testimony in the case.
MONTANA SET FIGURES
The Census Bureau has announced receiving set figures for the State of Montana. Out of 137,010 families in the State, 43,809 or 32 per cent have radio sets. The num^rer of persons per family is 3,9.