Psion Inc.

Psion Teklogix Inc.

Iain C Roy

Laurian Petru Chirila

Riyaz Bhanji

Mark Wright

Laurian P Chirla

A network communication card is provided for facilitating ultra high frequency (UHF) radio communication between a terminal and a base station, the network communication card being in communication with an antenna and comprising a double-sided multilayer printed circuit board (PCB). The PCB comprises a digital interface, a receiver and a transmitter. The digital interface provides communication between the PCB and the terminal. The receiver receives incoming radio signals from the base station and processes the received signals for communication to the terminal via the digital interface. The transmitter transmits outgoing radio signals from the terminal via the digital interface to the base station and includes the following components. A digital synthesizer provides a highly accurate modulated carrier signal. An upconversion circuit increases the frequency of the carrier signal. A filter filters spurious content from the carrier signal. A phase locked loop (PLL) comprising a synthesizer and a voltage controlled oscillator (VCO) generates a transmission signal from the filtered carrier signal. A transmission circuit transmits the transmission signal via the antenna.

Digital wireless narrow band radio

A cap assembly attachable to a main housing of a handheld device. The cap assembly includes a cap body at least partially defining one or more cavities therein, and one or more WAN antennas receivable in the cavity. In addition, the cap assembly includes an electromagnetic shield receivable in the cavity for providing each WAN antenna with a predetermined electromagnetic environment in which the impedances of the WAN antenna and the electromagnetic shield are substantially matched.

Cap assembly

A method, apparatus and system are described for adjusting the frequency of one or more clock signals used by a device. The one or more clock signals are adjusted by a determined amount when a channel quality metric of an RF channel in use by the device indicates a degradation in the reception quality.

Channel reception characteristics through clock rate adjustment

A portable terminal has a first enclosure of a housing having a first interior to contain a plurality of electronic components and a ground. The terminal has a second enclosure of the housing for coupling to the first enclosure, the second enclosure having a second interior to contain an antenna and for facilitating at least one of receiving or transmitting of electromagnetic (EM) signals between the antenna and an environment external to the second enclosure. The terminal has an EM shield positioned at an interface between the first interior and the second interior, the EM shield including electrically conductive material to absorb EM radiation generated by the plurality of electronic components. Also included is an electrically conductive coupling to couple the EM shield to the ground of the first enclosure.

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Mississauga, Canada

Iain C Roy