A High Performance FM-AM Automobile Receiver

The design of an FM-AM receiver poses a variety of problems peculiar to the automobile environment. Techniques relating to AM performance are well known and will not be covered in this paper except where FM and AM circuitry are common or possibility of interference exists. The FM problems encountered are those concerned with the design of any good quality FM receiver plus those associated with satisfactory performance under greatly varying signal conditions: ambient temperature ranges of -20°F to +140°F and impulsive interference from the automobile in which the receiver is installed, other automobiles, and other sources of noise.