Radio age research, manufacturing, communications, broadcasting, television (1941)

Record Details:

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wisli to use It as a vantage point for cameras or the re- lay transmitter. A ladder with hand railing is provided for access to the roof through a self-locking waterproof hatch. Provision has been made for roof-mounting the four-foot parabolic antenna of the relay transmitter as well as whip antennas for the FM audio transmitter and intercom radio system. The second mobile unit contains the transmitter power supply equipment, which consists of two power- ful gas driven generating units. One of the generators is designated for standby use, or to supply power to special lighting equipment for illuminating the scene to be televised. By means of a special switch, the truck batteries are able to supply power to the two-way radio communication system when the caravan is in motion and the generators are not in use. A receiver-display unit forms the third coach in the caravan. In addition to housing tlie FM and microwave receiving equipment, it contains ten 16-inch picture monitors, a I6mm TV projector and film camera, slide projector, a large-screen television projector, and a video switching panel for selecting any of several TV signal sources. The self-contained power supply for the receiver- display coach is housed in the fourth truck. It is similar to the transmitting power supply unit, except that it contains only one generator. The entire caravan has been carefully built and styled to Signal Corps specifications. Every vehicle is equipped with necessary test equipment and spare parts. E.ich of the coaches bears the Signal Corps insignia and is painted in traditional Army olive drab, with attractive aluminum strip. The units are completely weather- proofed, with cooling and heating units to condition the interior for all-weather operation. 21-inch Kinescope Uses Full Screen Area Th HE television industry's largest metal, rectangular picture tube, a 21-inch kinescope, has been announced by the RCA Tube Depanment. The new kinescope em- ploys the metal-shell construction, first introduced by RCA over two years ago as a major innovation in the 16-inch round metal tube. The new kinescope utilizes the full screen area, producing a picture 18-^8 inches wide by 13-15/16 inches high, with slightly curi'ed sides and rounded corners. Providing pictures with high brightness and good uniformity of focus over the entire picture area, the tube has a white fluorescent screen on a relatively flat face made of frosted Filterglass, which minimizes reflection of bright objects in the room and increases picture contrast. Conforming to proportions of the transmitted pic- ture, the tube's rectangular shape avoids waste of screen area. This permits the use of a cabinet having about 20 per cent less height than is required for a round-face tube providing pictures of the same width. In addition, the chassis need not be depressed or cut out under the face of the tube, and controls can be located as desired beneath the tube. Employing magnetic focus and magnetic deflection, the new kinescope is designed with a funnel-to-neck seaion which facilitates centering of the yoke on the neck. This feature, in combination with improved cen- RADtO AGE 29 tering of the beam inside the neck, contributes to the tube's good uniformity of focus. Other features incorporated in the new 21-inch pic- ture tube are short over-all length, substantially lower weight than that of a similar all-glass tube, a higher- quality faceplate than is commonly used in all-glass rubes, and an ion-trap gun requiring only a single-field, external magnet. This 21-inch kinescope, developed by the RCA Tube Department, is the industry's largest metal rectan- gular picture tube.