Abstract: A digital television (DTV) station which, in addition to broadcasting a digital television signal, also broadcasts simultaneously one or more analog FM radio signals, using part of the same spectrum allocated to the digital TV station.

Abstract: An antenna for providing a vertically polarized omnidirectional horizontal radiation pattern comprising colinear dipoles. Suitable feeding arrangements are provided for electromagnetically feeding the dipoles with a signal. An axially extending conductive member is spaced on either side of the colinear dipoles. The axis of each of said conductive members as well as the axis of the dipoles are colinear and parallel.

Abstract: A probe excited, open-end waveguide which can be used as an independent antenna, or as a launcher for an end fire, radiator and which achieves higher gain than conventional waveguides without an increase in size. The waveguide is formed as an elongated metallic container which includes a metal structure positioned within the container spaced from the side walls of the container and located within one half of the volume of the container, this volume being defined by cutting the cylinder along its elongated axis. A probe extends from the metal structure for excitation of the waveguide. An electronics package, conventionally utilized in conjunction with the waveguide can be positioned in the container within or under the metal structure. The electronics package does not interfere with the operation of the antenna. The antenna achieves higher gain as a result of the presence of the metal structure.

Abstract: An antenna assembly comprising elementary driven antenna elements and curvilinear end-fire directors on a conventional supporting structure to obtain an omnidirectional or other desired antenna pattern, even for supporting structures of relatively large transverse dimensions. The end-fire directors employ one or more curved conductive members.

Abstract: A disc-on-rod end-fire type antenna is disclosed in which close to optimum gain is maintained over a large range of antenna lengths, using the same disc size and spacing for all lengths.

Abstract: A microwave television system comprising, a probe excited waveguide, an electronics circuit package contained within the waveguide, and a support for mounting the waveguide. The probe excited waveguide is an open-end waveguide which can be used as an independent antenna or a launcher for an end fire radiator, and which achieves a higher gain than conventional waveguides without an increase in size. The waveguide is formed of an elongated metallic container and includes a metal structure positioned within the container spaced from the side walls of the container and located within one half of the volume of the container, this volume being defined by cutting the cylinder along its elongated axis. A probe extends from the metal structure into the other half of the container for excitation of the waveguide. The electronics package conventionally utilized in conjunction with the waveguide can be positioned in the container beneath the metal structure.

Abstract: An omnidirectional broad band antenna employs a slot and a pair of radiating arms excited by the slot. In one embodiment slots are formed in a coaxial transmission line and covered by a resin bonded filament wound glass fiber tube which serves as an integral radome and permits pressurization. The arms are of substantial girth and arc upwardly, downwardly respectively and circularly, one clockwise and the other counterclockwise thus providing a large spacing between arms. The antenna is characterized by a broad bandwidth and low VSWR.

Abstract: A broadband omnidirectional slot antenna suitable for transmission of television signals employing a wide slot and a wide, long strap between a feed point and the slot edge.

Abstract: An omnidirectional broad band antenna employs a slot and a pair of radiating arms excited by the slot. In one embodiment slots are formed in a coaxial transmission line and covered by a resin bonded glass fiber layer which serves as an integral radome and permits pressurization. The arms are of substantial girth and one arcs upwardly and circularly and the other arcs downwardly and circularly thus providing a large spacing between arms. The antenna is characterized by a broad bandwidth and low VSWR.

Abstract: An omnidirectional circularly polarized transmitting antenna employing a single row of slot antennas mounted on a metal support tube and a single row of dipole antennas mounted between the slots and a narrow vertical metal member parallel to the dipoles, the slot and dipole antennas each excite parasitic end-fire directors to control radiation patterns and phase centers.

Abstract: A transmitting antenna assembly comprises elementary driven antenna elements and generally radially extending fins mounted on a conventional supporting structure to obtain an omnidirectional or other desired antenna pattern, even for supporting structures of relatively large transverse dimensions.