Abstract: Embodiments of the invention generally provide a radio frequency switch, for example for use in a satellite receiver. The switch includes a plurality of input ports and a plurality of output ports, where output ports independently select signal paths from any of the input ports. The entire switch is embodied in a compact single-board layout. In another embodiment, a satellite receiver includes at least one antenna for receiving a signal from a satellite transponder and a radio frequency switch for selecting the satellite transponder from among a plurality of satellite transponders.

Abstract: Embodiments of the invention generally provide a radio frequency switch, for example for use in a satellite receiver. The switch includes a plurality of input ports and a plurality of output ports, where output ports independently select signal paths from any of the input ports. The entire switch is embodied in a compact single-board layout. In another embodiment, a satellite receiver includes at least one antenna for receiving a signal from a satellite transponder and a radio frequency switch for selecting the satellite transponder from among a plurality of satellite transponders.

Abstract: To prevent undesired bending of vertical bar type information displayed on the screen of a kinescope due to kinescope beam current variations, modifying circuits are provided for reducing the beam current threshold level of an automatic beam current limiter stage to a lower threshold level whenever vertical bar type information is displayed.

Abstract: A high voltage generator in a television receiver responds to horizontal deflection rate signals from a horizontal oscillator which normally responds to a horizontal sync signal derived from the television signal. A sync validity detector provides a control signal indicative of the validity of the horizontal sync signal to an electronic tuning system in order to identify active channels, and to the deflection system to inhibit the response of the deflection system to false sync signals otherwise capable of causing the oscillator to operate a lower frequency likely to cause the high voltage generator to develop an excessively high voltage.

Abstract: A video sync validity detector comprises a peak detector circuit and an average detector circuit both responsive to output signals from a sync separator network. Sync representative signals are provided from the output of the peak detector. The average detector is coupled to the peak detector for inhibiting sync representative outputs therefrom in the presence of sync separator output signals representative of false sync signals of average value.