Abstract: Embodiments of the present invention recite an improved signal receiver circuit and a method of implementation. In one embodiment, a first signal pathway of a low-noise block feedhorn comprises a ceramic low-pass filter coupled with a first polarity signal input. In accordance with embodiments of the present invention, a second signal pathway of the low-noise block feedhorn comprises ceramic high-pass filter coupled with a second polarity signal input.

Abstract: An antenna structure has a rotatable dipole array constituting a driven antenna element, a cup mounted around the dipole, a first conductor connected to and extending from the antenna, and a first dielectric mounted around the first conductor. A second conductor is mounted around the first dielectric, and a second dielectric is mounted around the second conductor. A third conductor is mounted around the second dielectric, and the first and second conductors form a quarter-wavelength transformer. The first dielectric maintains a uniform spacing between the first and second conductors, and the third conductor defines a radio-frequency coupling cavity. The second dielectric electrically enlarges the cavity. Thus the physical dimensions of the structure can be reduced without sacrifice of its electrical properties.

Abstract: A mass programmable FM assistive listening system preferably consists of an FM transmitter adapted to send audio signals on a selected one of a plurality of predetermined available channels. The system includes a plurality of portable receivers which may be mass programmed to receive a selected one of said predetermined channels from a membrane style keypad. The audio signal is preferably stereo, sound equalized and within the frequency range of from about 72 to about 76 megahertz.

Abstract: A satellite broadcast system using an airwave message signal to remotely control a signal receiver. The system includes a system manager to issue a message, a message service to broadcast the message in the airwave message signal, and a signal receiver to select a satellite and a channel of a downlink signal from the satellite carrying a desired program. The program may include audio/video, text, pictures, software, or data. In the preferred embodiment, the message service is a pager service.

Abstract: A satellite network receiver connected to receive video and audio programs and commands from orbiting satellites through a steerable dish antenna. Commands are alternatively received by the satellite receiver via pager radio service or phone wire from a network controller that uplinked the satellite programming. All user controls are eliminated from the satellite receiver and the network controller uses its command capability to steer the users antenna and to analyze and initiate diagnostics performed on various parts of the satellite receiver.

Abstract: A dual band signal receiver is provided with relatively coaxial antenna assemblies electromagnetically coupled to respective upper and lower band rectangular waveguides and ports through suitable polarization switching assemblies. The upper band rotatable antenna assembly consists of a dipole feed having driven dipole elements, parasitic dipole elements and a corner reflector element electromagnetically coupled to the upper band rectangular waveguide by a suitable transmission line extending substantially along the longitudinal axis or centerline of the lower band cylindrical waveguide.

Abstract: Signal propagation apparatus is formed with a waveguide cavity for propagating first and second electromagnetic signals respectively having first and second electric fields that are distinguished outside the cavity by first and second polarizations, for example orthogonal polarizations, one vertical and one horizontal. Within the cavity, the electric field lines are curved and cross one another at angles that vary as a function of location within the cavity. A pair of probes are mounted within the cavity in spaced-apart relation to each other and have orientations that differ from the orientations of the electric fields outside the cavity. In order to send or transmit signals having electric fields that are respectively vertically and horizontally polarized, for example, thereby forming an angle of 90.degree. with respect to each other, the probes lie in planes forming a dihedral angle of about 80.degree..

Abstract: A dual band signal receiver is provided with inner and outer relatively coaxial cylindrical waveguides electromagnetically coupled to respective upper and lower band rectangular waveguides and ports through suitable polarization switching probe assemblies. The rectangular waveguides are mounted adjacent one end of the outer cylindrical waveguide. The rotatable probe assembly of the inner cylindrical waveguide is electromagnetically coupled to the high band rectangular waveguide by a suitable transmission line extending substantially along the longitudinal axis or centerline of the outer cylindrical waveguide.

Abstract: A drive system for a twistable septum in a feedhorn for use in satellite communications antenna systems. The drive system includes a flexible drive rod, coupled to a drive motor, which bends to accommodate off-center coupling with the septum drive wheel.

Abstract: A high-frequency signal receiver has two separate probes arranged within a waveguide for receiving both modes of an orthogonally polarized signal. A first probe protrudes directly into a rectangular cavity located at the receiving end of a circular waveguide and a second probe is specially shaped to employ the walls of the rectangular cavity and the circular waveguide as a ground plane, thereby to form a transmission line connected to a receiver probe portion arranged in the circular waveguide that receives the other of the orthogonal polarization not received by the first probe but which is reflected outwardly by the rectangular cavity.

Abstract: An optimized feedhorn comprising a circular waveguide having a corrugated plate disposed around the outside of the aperture of the waveguide wherein the corrugations of the plate are capacitive as to E plane signals. The feedhorn includes a reduced aperture diameter which selectively protrudes beyond the plane of the corrugated plate. The amount of protrusion of the aperture is determined to approximately equalize E and H plane beamwidths and selectively shape the top and skirts of the signal pattern around the center frequency of interest.

Abstract: A rotatable polarized signal receiver, having a rectangular waveguide orthogonally coupled to a circular waveguide, has a receiver probe portion oriented in the circular waveguide and a signal launch probe portion extending into the rectangular waveguide. A dielectric insert located in the circular waveguide transforms circularly polarized signals to linearly polarized signals. Since the receiver probe portion can be rotated right circular or left circular polarization can be selected and received.

Abstract: A continuously-variable septum for rotation of electric field polarization in a circular waveguide comprising a continuous, serpentine-shaped, electrically conductive filament.

Abstract: A rotatable polarized signal receiver in a system for receiving linearly polarized electromagnetic signals includes a signal conductor having a receiver probe portion, oriented in a circular waveguide parallel to the polarization of the incident signal, and signal launch probe portion extending into the rectangular waveguide orthogonal to the direction of signal transmission therein, mounted concentrically in an insulator rod through perpendicular coupling of the circular and rectangular waveguides.

Abstract: An improved feed horn for use with long f/D reflector antennae comprising an aperture having a plurality of protuberances orthogonally disposed around the periphery thereof, a conical section, a waveguide transition section and an impedance matching section.

Abstract: A rotatable polarized signal receiver in a system for receiving linearly polarized electromagnetic signals includes a signal conductor having a receiver probe portion, oriented in a circular waveguide parallel to the polarization of the incident signal, and signal launch probe portion extending into the rectangular waveguide orthogonal to the direction of signal transmission therein, mounted concentrically in an insulator rod through perpendicular coupling of the circular and rectangular waveguides.