Transistor circuits applied to telemetering

The PDM portion of a PDM-FM telemeter system for missile operation is described with respect to design philosophy. The system approach has been used in order to produce a compatible marriage of circuitry to the required input and output devices. This has been particularly profitable in the case of the commutator and 70 kc transistor subcarrier oscillator. Transistor circuits have been applied in all cases except the subcarrier oscillator and this is now in the final development stage. This paper discusses several applications which have been successfully transistorized and are now in production. The solutions of problems associated with design for simplicity of circuits, minimum size and weight, ruggedness and reliability are covered.