A 15 by 20-inch projection receiver for the rca colour television system

This paper describes two of the colour television receivers which were demonstrated by the RCA at the hearings before the FCC in Washington, D.C., on October 10th, 1949. It deals primarily with the description of a projection receiver which produces a 15 × 20-in. picture. This unit is a modification of the receiver described in ¿An Experimental Simultaneous Colour Television System¿2,3 and produces pictures of equal size and detail but with greater brightness. Modifications have consisted principally in the addition of sampler circuitry to adapt it to the new system, and the substitution of reflective optics for the refractive system previously used. Of course, r.f. and i.f. circuits have also been simplified to make use of a conventional black-and-white r.f.-i.f. system in place of the three channels necessary for wide-band simultaneous colour reception. In analysing these receivers it should be borne in mind that they are research models which were constructed for an evaluation of the potentialities of a new system.