Voltage-controlled plural-band tuner for a wave signal receiver

摘要: Selective tuning to any broadcast channel within a plurality of frequency bands is achieved by voltage-controlled tunable circuitry, such as the type employing varactor or varicap diodes, responsive an adjustable DC voltage, having unique levels assigned various desired channels. The voltage level, in across all bands, must be varied over predetermined amplitude range, portions which range are effectively different respective ones bands. Band switching circuitry occurs automatically and electronically under control voltage. Each time its changed from level one portion another portion, tuner made band. No mechanical switches needed accomplish band switching.