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Installation of Theater Television Equipment
By E. Stanko and C. Y. Keen
Recent initial installations of the RCA PT-100 Theater Television System are described. Problems encountered in these installations and their practical solution are discussed. Now that the first commercial Theater Television Systems have been installed in a number of representative theaters, the experience acquired at these installations will be valuable in reducing the installation of theater television equipment to a routine procedure, comparable to the installation of sound motion picture equipment. Procedures followed in making these initial installations are described, beginning with the preliminary theater survey to the final installation check and adjustment before projecting a picture on the screen, including service and maintenance problems.
Preliminary Theater Survey
Before an installation of theater television equipment is made in any theater, certain facts about the theater must be known. One of the most important items to be determined by the survey is the location of the equipment, especially the projector unit. The PT-100 System Projector employs a Schmidt-Type Optical System with a correction lens which is limited in projection "throw" to a definite operating range.
Figure 1 shows the operating range of the optical system. There are three variables :
1. Picture size,
2. Kinescope raster* size, and
3. Projection throw from projector to screen.
Presented on October 20, 1950, at the Society's Convention at Lake Placid, N. Y., by E. Stanko and C. Y. Keen, RCA Service Co., Inc., Camden, N. J. *Raster is defined as the illumination caused by the scanning lines on the cathode-ray screen when no television picture signal is being received. Picture
So far all of the initial installations have been made in balcony-type theaters, where the projector is mounted at the front face of the balcony or in the front part of the balcony structure.
The preliminary survey includes an elevation outline plan of the theater with dimensions so that the three variables shown on the chart can be resolved and the position of the projector and screen and screen size, determined.
Theater plans are obtained where possible and are carefully examined so that the theater exhibitor can be advised how to proceed with the installation.
The survey also determines the location of the control racks in the projection booth and the location of the 80-kv high-voltage power supply unit, and includes information that will be required to solve any unusual problems in connection with the installation of the equipment.
size is slightly smaller due to blanking interval.
March 1951 Journal of the SMPTE Vol. 56
343