Abstract: A radio frequency (RF) tuner includes a tuner housing, a cover coupled to a first side of the housing, and a tuner printed circuit board (PCB) including a plurality of layers coupled to a second side of the housing, wherein the layers are configured to shield the tuner PCB thereby reducing electromagnetic interference emissions and RF radiated fields in said PCB.

Abstract: A synchronous tracking filter circuit for use in a broadcast satellite tuner that comprises four varactors and a strip-shaped inductor plate or pcb-printed strip line which produces a resonant frequency. The circuit is used in a doubly tuned resonant circuit to incorporate the tracking with the frequency changes of a voltage controlled oscillator (VCO) synchronously. The circuit can also control the image interference. This type of design is applicable in the tuner of an indoor broadcast satellite receiver unit to act as the synchronous tracking filter of input frequencies.