Motorola Corporation

Ross E Ruthenberg

James A McDonald

Robert C Kane

Thomas A Freeburg

Christopher N Kurby

Thomas V D'Amico

Terry K Mansfield

Gary R Reynolds

Raul Olivera

Thomas R Gaynor

Jay G Smith

A shared spectrum communications unit and system provides communications without interfering with incumbent point-to-point receivers. This system includes a transmitter (e.g., of a PCS device) and a geographical location device which is operatively associated with the transmitter. The geographical locating device determines the position of the transmitter, and provides position information to a frequency authorization device. Geographical information pertaining to the PCS device is compared with the locations of the incumbent point-to-point receivers, using a database of the frequency authorization device including the locations of the point-to-point receivers, and a frequency allocation/authorization is generated to the PCS device when the PCS device is located outside of a predetermined range associated with local point-to-point receivers. An authorized frequency is stored and employed by the frequency authorization device for control of the operating frequency of the PCS device.

Frequency allocation for shared spectrum transmitter based on location

A radio frequency communication system is coupled to a telephone network having automatic number identification (ANI) capabilities for communication thereover. The radio frequency communication system includes at least one relocateable base station (115) which shares a radio frequency channel with stationary communication devices for communicating over predetermined geographic areas. The radio frequency communication system further includes a service center (125) which, in response to a call from a base station (115), receives from the telephone network information indicative of at least a portion of a telephone number from which the base station (115) is calling. The service center (125) determines therefrom whether the base station (115) is located within any of the predetermined geographic areas. When the base station (115) is not located within any of the predetermined geographic areas, the service center (125) transmits an authorization signal over the telephone network indicating that the base station (115) is authorized for radio frequency communication over the shared radio frequency channel.

Method and apparatus for sharing radio frequency spectrum in a radio

Radio frequency reuse between two or more radio frequency communications systems is facilitated by having a beacon transmitter broadcast information globally throughout an area, which information identifies to users of a second system, which radio frequency resources are already in use by a first communications system. The global broadcast of information as to what channels are in use, permits users in the second system to avoid interfering use of those frequencies.

System for informing secondary users of which radio channels are usable

A radio frequency communication system is coupled to a telephone network (130) having automatic number identification (ANI) capabilities for communication thereover. The radio frequency communication system includes at least one relocateable base station (115) which shares a radio frequency channel with stationary communication devices (105) for communicating over predetermined geographic areas (110). The radio frequency communication system further includes a service center (125) which, in response to a call from a base station (115), receives from the telephone network (130) information indicative of at least a portion of a telephone number from which the base station (115) is calling. The service center (125) determines therefrom whether the base station (115) is located within any of the predetermined geographic areas (110). When the base station (115) is not located within any of the predetermined geographic areas (110), the service center (125) transmits an authorization signal over the telephone network (130) indicating that the base station (115) is authorized for radio frequency communication over the shared radio frequency channel.

An electronic device that provides a multiplicity of electronic circuit functions within a single device package by utilizing a plurality of field emission devices wherein at least some of the field emission devices are employed to perform more than a single circuit function.

Multi-function field emission device

The invention is a microphonics suppression means for a high frequency resonant cavity. The resonant cavity is used in a RF oscillator to generate UHF/VHF frequencies. The resonant cavity comprises an outer wall portion, a center conductor portion, a tuning slug and a plurality of coupling probes. The coupling probes, tuning slug and center conductor are held in a fixed relationship by a microphonics suppression means made of a low dielectric material which fits over and around the center conductor and encapsulates the coupling probes and collars the tuning slug. The microphonics suppression means reduces the effect of microphonics on the output signal of the RF oscillator, thus allowing a clean output signal suitable for high power applications.

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WoodDale, IL, United States of America

Ross E Ruthenberg