Hughes Electronics Corporation

Harry M Johnson

Victor Liau

Tayyab Khan

Kalyan Ganesan

Ranjan Pant

Desmond Coughlin

Stanley Edward Kay

Bala Subramaniam

John E Corrigan, Iii

Donald Stuart Arnstein

Steven A McPhilmy

Kim Goh

Robert Fischler

Keerthilatha Chikkaswamy

Barry Saunders

Ghassan Zamat

Desmond Coghlan

A radio, and related methods of radio communication, consisting of a multi-modulation modem, wherein the multi-modulation modem that modulates and demodulates signals using a plurality of modulations. The radio also comprises a frequency converter coupled to the multi-modulation modem for converting the signals to a radio frequency and a transceiver unit including an antenna coupled to the frequency converter for transmitting the signals over a radio communications link. The multi-modulation modem includes a modulator that includes a modulation selector unit that selects respective ones of the plurality of modulations to modulate the signals. The multi-modulation modem also includes a demodulator for demodulating the signals having been modulated using the plurality of modulations.

Multi-modulation radio communications

A hydrogen getter device includes a package made from a material that is hydrogen permeable and moisture impermeable. A preferred hydrogen getter is a particulate zeolite having a portion of its sodium ions exchanged by an activated metal, such as silver. The package can be a flexible enclosure made from the hydrogen permeable moisture impermeable sheet material and surrounded by a porous protecting material. In one embodiment, the package includes an internal wall to define a first enclosure containing the hydrogen getter and a second enclosure containing a moisture absorbing agent or desiccant, such as a zeolite. The package is suitable for use in electrical enclosures having an internal volume of about 5 liters to about 100 liters or more.

Hydrogen getter package assembly

The present invention relates to a wireless personal communications system (WPCS) having several features embodied in several forms. In one embodiment, the, WPCS includes at least one RP, a first SU in communication with the RP, and a second SU in communication with the first SU through the RP without involving the RPC in the manner contemplated by the specification. The RP may preferably include a channel switching unit for connecting the first SU with the second SU without using any tariff lines to or from an RPC. Such an RP may be used as a component in a wireless PBX or Centrex system including ISDN based systems. Another preferred embodiment provides for a walkie-talkie option where the first SU communicates directly with the second SU, preferably over an unlicensed frequency. In another preferred embodiment, a plurality of SUs in communication with an RP may be accessed individually using a single dialed number.

Wireless personal communication system

The present invention relates to a subscriber unit in a wireless personal communications system (WPCS). In one embodiment, the subscriber unit includes a digital dataport for modemless communication of digital signals. Another preferred embodiment provides for a subscriber unit having a cable television transport module for modulating and demodulating signals over unused bandwidth available on cable television lines.

Subscriber unit in a wireless personal communication system

The present invention relates to a radio port in a wireless personal communications system. The radio port includes a first channel in communication with a first subscriber unit, a second channel in communication with a second subscriber unit, and a switching device connecting the first channel to the second channel so that the first subscriber unit may communicate directly with the second subscriber unit. In another preferred embodiment, the radio port includes a plurality of antennas, an RF receive section, an RF transmit section, an analog port adapted for connection to an analog telephone line, a digital dataport for receiving and transmitting digital signals, and a databus interconnecting the RF receive section, RF transmit section, analog port, and digital dataport. The RF receive section includes a diversity selection unit receiving an input signal from each of the antennas. The RF transmit section generates an output signal to be transmitted over at least one of the antennas.

Radio port in a wireless personal communication system

A RF sniffer module and method for detecting the availability of cellular communication channels for data transmission. The module monitors the channels used in a cellular communication network to determine when a particular channel is idle, meaning it is not being currently used for communication. The module communicates the status of the channel to an overlay system. Thus, the overlay system is informed that a particular channel is idle and thus can be used for data transmission or that the channel is not available and thus the overlay system can not use that channel without interfering with the operation of the cellular communication network.

RF sniffer module and method with a self-test circuit

Growing community of inventors

Springfield, VA, United States of America

Harry M Johnson