Abstract: A detachable battery pack is connected to a personal computer card modem at the same side as an antenna. An advantage of this system is that the detachable battery pack can be added and removed from the personal computer card without affecting the antenna connection to the personal computer card. The antenna need not be connected to the personal computer card through the battery pack.

Abstract: A power management system for a PC card is disclosed. The power management system allows for a detachable battery pack to be used on a PC card. The PC card can select power from the personal computer or from the detachable battery pack. In one embodiment, power can also be selected from a DC wall adaptor, which can be connected to the PC card or battery pack. In another embodiment, the power controller on the PC card is always powered by the personal computer, so that the power management system can work even when a detachable battery pack is low in power or not connected to the PC card. The battery pack can be recharged from the DC wall adaptor or from the personal computer.

Abstract: An extendable antenna for a personal computer card uses two main antenna elements. A movable antenna element can be positioned in an extended position such that the base of the second antenna element electrically contacts the top of the other antenna element. The antenna in the extended position is connected to the antenna port through matching circuitry. In a closed position of the antenna, the second antenna element is electrically connected to the antenna port bypassing the matching circuitry. In one embodiment, the antenna is a quarter-wave length antenna in the closed position and a half-wave length antenna in the extended position.

Abstract: A mechanism is provided for substantially reducing heat buildup within a mobile radio device having a radio transmitter. The invention is particularly applicable to PC Card wireless modems. In accordance with one aspect of the invention, device temperature in a mobile radio device is controlled by monitoring the temperature of the mobile radio device; if the temperature of the mobile radio device exceeds a threshold then, when the mobile radio device is to transmit information, transmission power of the mobile radio device is reduced, thereby reducing the amount of heat generated within the mobile radio device and allowing the temperature of the mobile radio device to decrease. Transmission power is reduced sufficiently to allow the temperature of the mobile radio to decrease but not so much as to affect the reliability of transmission in the typical case.

Abstract: An antenna connector includes a body portion having an opening extending therethrough, a flange extending from a first side of the body portion in a direction substantially perpendicular to a direction of an axis of the opening, and one or more ground pins extending from a third side of the body portion in the direction of the axis of the opening. The antenna connector further includes a coaxial pin member extending through and secured to the opening in the body portion, the coaxial pin member including a pin portion extending outwardly from the opening in a direction of and parallel to the one or more ground pins.

Abstract: A radio-frequency output signal having a specified characteristic is produced using a combination of a calibrated radio unit in which a calibration factor is stored and an uncalibrated modem unit. The calibration factor is input to the modem unit from the radio unit, and the modem outputs to the radio unit a signal of a nominal signal level determined in accordance with the calibration factor. An actual signal level of the signal is measured, and a gain factor within the modem unit is adjusted until the nominal signal level and the actual signal level are substantially equal. A wireless modem includes a calibrated radio unit and an uncalibrated modem unit coupled to the radio unit. A first signal path is provided from the modem unit to the radio unit, and a feedback signal path from the radio unit to the modem unit.

Abstract: A low power reduced size serial device protocol translator including a slave controller and detection circuit for detecting start and stop conditions on serial data (SDA) and serial clock (SCL) lines in a serial communication system is described. The start and stop condition detector includes two flip-flops; one for providing a signal that indicates when a start condition has occurred on the SDA and SCL lines and another for indicating when a stop condition has occurred. Each of the flip-flops have their data inputs coupled to a high logic level and their enable input coupled to the serial clock line. The first flip-flop for indicating the start condition has its clock input coupled to the inverse of the serial data signal and the second flip-flop for indicating the stop condition has its clock input directly coupled to the serial data signal.

Abstract: An integrated circuit card, such as PC Card, is provided in which a step-down converter in the form of a switching regulator provides a stable operating voltage at increased current beyond what is normally available from a single source. In particular, a quiet and stable power supply is obtained by modifying the standard configuration of a switching regulator such that the catch diode, or free-wheeling diode, instead of being connected to ground at the non-blocking terminal, is connected to a primary voltage source approximating the desired output voltage. If the desired output voltage is 5V, for example, the catch diode may be connected to Vcc supplied by a PC Card slot, which nominally supplies 5V. The block terminal of the catch diode is connected through the switch of the switching regulator to a higher, supplementary, voltage source, e.g. Vpp=12V in the case of a PC Card slot.

Abstract: An integrated cellular switched modem for enhanced cellular data communication by implementing in DSP or Software all baseband processing normally carried out in a cellular radio transceiver within the processor of the single integrated wireless modem. Adjustments are made to EIA/TIA standards for pre-emphasis, de-emphasis, and companding functions implemented by DSP in order to optimize communication for data.

Abstract: An electrical enclosure for a circuit board includes a top part and a bottom part. Substantially rigid compression fingers extend downwardly from a top wall of the top part and are disposed inwardly from a top side wall of the top part. One or more shield springs extend upwardly from a bottom wall of the bottom part and are disposed inwardly from a bottom side wall of the bottom part. The top part and the bottom part are attachable and detachable such that the top and bottom shells define a chamber, the compression fingers and the shield springs contacting top and bottom surfaces of the circuit board, respectively, to thereby suspend the circuit board in the chamber. A coaxial cable grounding arrangement and an electrical connector shielding arrangement are also disclosed.

Abstract: Modem throughput across a cellular mobile telephone network is increased by controlling the response of the modem to blank and burst orders. In the case of a power control order, the modem may be made aware of the fact that the channel has not changed. Significant performance gain in terms of channel throughput can then be achieved by avoiding a lengthy retraining procedure. The modem operation may be suspended during the blank and burst order and enabled after the blank and burst order, avoiding an unnecessary retrain procedure during the blanking period. In the case of a handoff, the modem may be directed to immediately perform a retrain procedure rather than wait for the long blanking period to be detected by the modem or the link access procedure.

Abstract: A method for reducing the effects of transients on the DC off-set tracking stage and the symbol timing recovery stage in a full duplex or half duplex packet switched data communication system-in which transients occur in the receiver portion of the subscriber when the transmitter portion of a subscriber is keyed ON and OFF is described. The method is dynamically implemented such the DC tracking stage and the symbol timing recovery stage are set in a first "distortion ready" mode during the time that the transmitter is keyed on and off and is set back to a second "normal" mode after the transmission event is over. In the "distortion ready" mode, the symbol timing recovery stage is set in a "freeze" state such that it makes no further timing adjustments to a decision clock that it generates and the DC off-set recovery stage is set to a narrow bandwidth mode such that it does not track large variations in the DC off-set and amplitude in the received signal.

Abstract: In a pivotable antenna assembly, a pivot rod is provided having an axial opening therein at a first end thereof and a radial opening extending to the axial opening. An antenna is provided, the antenna having an antenna element and a portion through which a portion of the pivot rod extends such that the axial opening of the pivot rod is inside the portion of the antenna. A coaxial cable having a first end is provided, the coaxial cable including a central conductor, a dielectric material around the conductor, a shielding material around the dielectric material, and a jacket around the dielectric material, the first end of the coaxial cable extending into the axial opening of the pivot rod, the shielding being attached to an interior wall of the pivot rod, and the conductor extending through the radial opening and being attached to the antenna element. A method for making a pivotable antenna assembly is also disclosed.