SINGLE TURN FERRITE ROD ANTENNA AND METHOD.

    公开(公告)号:GB2255447A

    公开(公告)日:1992-11-04

    申请号:GB9204454

    申请日:1992-03-02

    Applicant: MOTOROLA INC

    Abstract: An antenna (10) is described comprising a generally elongate, magnetically permeable core (12) having a major axis, an insulating substrate (20) being affixed to the core (12) along an axis parallel to the major axis, and having at least a pair of opposed spaced conductive runners (21) positioned along the substrate normal to said major axis. A plurality of charge storage devices (capacitors) (16) are secured between the pair of opposed spaced conductive runners (21). An electrically conductive split sleeve (14)15 positioned surrounding the core (12), and has first and second edge portions (26) in electrical connection with the pair of opposed spaced conductive runners (21) opposite said charge storage devices (16). Arrangements for mechanically mounting the antenna (10) are provided which are integral to the antenna (10). The mechanical mounting arrangements are separate from the arrangements provided for electrically connecting the antenna 10 to the receiver. The mechanical mount includes grooves (28) to receive a pcb, projections of the sleeve (14), interconnecting posts, tapered core projection interengaging with a pcb, or snap-fit latches between the core and a housing. Electrical connections to a pcb comprise sleeve projections (18), conductive tracks on the substrate (20) or parts upstanding from the substrate.

    47.
    发明专利
    未知

    公开(公告)号:AT182431T

    公开(公告)日:1999-08-15

    申请号:AT90915384

    申请日:1990-10-01

    Applicant: MOTOROLA INC

    Abstract: A global communications system is described having terrestrial transmitters (1108) for transmitting coded message signals in each of a plurality of geographic areas (1102, 1104, 1106). The global communication system further includes at least one satellite transmitter (1114) for transmitting the coded messages signals in each of a plurality of global geographic areas. The coded message signals transmissions include channel identification codewords identifying the terrestrial channels and the satellite channel. The terrestrial channel is selected for operation when the channel identification codeword received matches a first predetermined channel identification codeword. The satellite channel is selected for operation when the channel identification codeword does not match a second predetermined channel identification codeword. The terrestrial channel is periodically reselected when the channel identification codeword received on the satellite channel matches the second predetermined channel identification codeword.

    48.
    发明专利
    未知

    公开(公告)号:AT176109T

    公开(公告)日:1999-02-15

    申请号:AT90914332

    申请日:1990-09-12

    Applicant: MOTOROLA INC

    Abstract: A satellite paging system is described for providing geogrpahic protocol conversion for data packet delivery to communication receivers located in a plurality of geographic areas. The system includes a transmitter for transmitting data packets formatted in a first predetermined data format to the communication satellite. The satellite includes a receiver for receiving the data packets and a programmable encoder coupled to the receiver for encoding the received data packets into encoded data packets in a second predetermined data format corresponding to the signaling requirements of each geographic delivery area. A satellite transmitter coupled to the programmable encoder then transmits the encoded data packets in the second predetermined data format to a portable communication receiver, operable in the second predetermined data format in the geographic delivery area.

    Method and apparatus for adaptively selecting a communication strategy in a selective call radio communication system

    公开(公告)号:AU686927B2

    公开(公告)日:1998-02-12

    申请号:AU4693996

    申请日:1996-01-11

    Applicant: MOTOROLA INC

    Abstract: A method and apparatus adaptively selects a communication strategy for communicating a message in a selective call radio communication system including a fixed portion (100) and a portable portion (101). The fixed portion (100) transmits (402) an alert signal to the portable portion (101), and awaits (404) an acknowledgment signal including a signal quality estimate from the portable portion (101). The portable portion (101) receives (602) the alert signal, and computes (604, 606) the signal quality estimate therefrom. The portable portion (101) then sends (608) the acknowledgment signal to the fixed portion (100). In response to the acknowledgment signal, the fixed portion (100) selects (407) a transmission strategy in accordance with the signal quality estimate. For compatibility, the transmission strategy requires a matching reception strategy in the portable portion (101). After sending the acknowledgment signal, the portable portion (101) selects (609) the matching reception strategy in accordance with the signal quality estimate sent in the acknowledgment signal without requiring further communication with the fixed portion (100).

    PROCESS AND APPARATUS FOR ADAPTIVE SELECTION OF COMMUNICATION STRATEGY IN A RADIO COMMUNICATION SYSTEM WITH SELECTIVE CALL

    公开(公告)号:CZ262797A3

    公开(公告)日:1998-01-14

    申请号:CZ262797

    申请日:1996-01-11

    Applicant: MOTOROLA INC

    Abstract: A method and apparatus adaptively selects a communication strategy for communicating a message in a selective call radio communication system including a fixed portion (100) and a portable portion (101). The fixed portion (100) transmits (402) an alert signal to the portable portion (101), and awaits (404) an acknowledgment signal including a signal quality estimate from the portable portion (101). The portable portion (101) receives (602) the alert signal, and computes (604, 606) the signal quality estimate therefrom. The portable portion (101) then sends (608) the acknowledgment signal to the fixed portion (100). In response to the acknowledgment signal, the fixed portion (100) selects (407) a transmission strategy in accordance with the signal quality estimate. For compatibility, the transmission strategy requires a matching reception strategy in the portable portion (101). After sending the acknowledgment signal, the portable portion (101) selects (609) the matching reception strategy in accordance with the signal quality estimate sent in the acknowledgment signal without requiring further communication with the fixed portion (100).

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