Transistorized FM and TV Limiter Design and Performance

Abstract

This paper discusses recent experiments which demonstrate the feasibility of using transistor limiters at 4.5 and 10.7 mc. The circuits are fully described and the limiting performance discussed in detail. In the past transistors have sometimes shown poor performance as limiters because of a non-linear feedback effect between the collector and base of the transistor. The circuits that are to be presented are novel in that they include provisions for eliminating this effect. The circuits to be described are fully capable of meeting the design requirements of conventional vacuum tube limiters and as such permit the design of transistorized equipment which is fully competitive with vacuum tube equipment in this respect.