Radio annual (1938)

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FCC REGULATIONS properly carried forward on the frequencies in subsection (a) of this rule due to the characteristics of these frequencies, applicants may request and be assigned any frequency specified in Rule 1073 on an experimental basis. (c) Other frequencies under the jurisdiction of the Commission may be assigned for experimental operation of facsimile broadcast stations on an experimental basis provided a sufficient need therefor is shown and no interference will be caused to established radio stations. (d) Each facsimile broadcast station will be licensed for only one frequency except in subsection (b) of this rule more than one frequency may be licensed to one station if need therefor is shown. (e) Each applicant shall specify the frequency or frequencies desired and the maximum modulating frequencies proposed to be employed. (f) The operating frequency of a facsimile broadcast station shall be maintained in accordance with the frequency assignments as shown by Rule 980, provided, however, where a more strict adherence to the assigned frequency is necessary to prevent interference, the Commission will specify the tolerance. (Con't from pnge 440) (g) A facsimile broadcast station authorized to operate on frequencies regularly allocated to other stations or services shall be required to abide by all rules governing the stations regularly operating thereon, which are applicable to facsimile broadcast stations and are not in conflict with Rules 980 to 986, inclusive, and Rules 1030 to 1039, inclusive, excluding Rule 1035. The power output rating of a facsimile broadcast station shall not be in excess of that necessary to carry forward the program of research. The operating power may be maintained at the maximum rating or less, as the conditions of operation may require. A supplemental report shall be filed with and made a part of each application for renewal of license and shall include statements of the following: 1. Number of hours operated for transmission of facsimile programs. 2. Comprehensive report of research and experimentation conducted. 3. Conclusions and program for further developments of the facsimile broadcast service. 4. All developments and major changes in equipment. 5. Any other pertinent developments. MODERN TELEVISION SYSTEMS nels, usually from 44,000 to 72,000 kilocycles. This removes troubles from sky waves and fading, such as found in broadcast and short wave radio, but restricts the useful range of a transmitter to a future maximum of probably eighty-five miles. Compared to present fifty kilowatt broadcast transmitters, most television transmitters are of medium power, rarely exceeding eight kilowatts. New methods of modulation are often employed. A modified grid bias method has been employed by the Don Lee organization for several years. The Philco organization has recently made known a "transmission line" method where the modulator is placed at the end of a quarter wavelength line properly connected to the transmitterantenna transmission line. The original nlamentless cathode ray tube of Braun of a half-century ago little resembled the precise instrument of today. Usually employing electrostatic focusing taken from the new field of electron optics, an "electron gun," powered by a heater type cathode filament, produces a small but intense 451 (Con't front page 448) beam of electrons at the narrow end of a cathode-ray tube. This beam is deflected, either by deflection plates or by deflection coils, over the fluorescent screen which is located on the large or viewing end of the tube. The output of the receiver scanning sources, synchronized by the incoming synchronizing pulses being applied to the plate or coils, causes the moving spot of light, formed on the fluorescent screen by the impact of the electron beam upon it, to be at all times in the same relative position on the receiver screen as is the exploring spot at the transmitter pickup tube or film scanner. The sound channel of television is essentially a duplicate of present high frequency broadcasting, "apex," facilities. In this way is modern television accomplished. It employs instrumentalities previously unknown, and others borrowed from parent arts which have been perfected to an unbelievable degree. All this to accomplish a fundamental human desire, the ability to see at a distance, as we are now able to hear at a distance over the radio.