Crossmodulation in transistorized AM auto radio receivers

This paper describes the antenna and rf circuits of a transistorized AM auto radio receiver whose design emphasizes improved crossmodulation characteristics. The receiver discussed uses a single-tuned antenna and a single-tuned rf load. This design is shown to provide high stability across the broadcast band, as well as an acceptable signal-to-noise ratio and over-all bandwidth. The crossmodulation performance of this receiver is compared with that of receivers using different antenna and interstage coil configurations. Results are given of both laboratory evaluations and field testing under actual operating conditions.