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An Experimental Automobile Receiver Employing Transistors

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3 Author(s)
Freedman, L.A. ; RCA Laboratories Div., Princeton, N.J. ; Stanley, T.O. ; Holmes, D.D.

This paper describes an experimental automobile broadcast receiver utilizing nine experimental junction transistors in a superheterodyne circuit. The receiver operates directly from the six-volt storage battery without vibrator, power transformer, or rectifier. The average current drain, including that for two pilot lights, is approximately one-tenth that of a conventional automobile receiver. The performance of this receiver is comparable to that of conventional automobile receivers. Particular emphasis has been placed on maintaining performance over a wide range of ambient temperature, both to accommodate the severe requirements specified for automobile service, and to establish the operability over such a temperature range of apparatus employing germanium transistors. The receiver circuits and performance characteristics, including performance data for the ambient temperature range -40 degrees C. to +80 degrees C., are described in detail. Techniques which render circuit operation insensitive to variation of ambient temperature and which permit interchangeability of transistors are discussed.

Published in:

Proceedings of the IRE  (Volume:43 ,  Issue: 6 )