23.
    发明专利
    未知

    公开(公告)号:BR9607621A

    公开(公告)日:1998-06-09

    申请号:BR9607621

    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).

    Automatic antenna tuning system for portable communication devices

    公开(公告)号:HK9197A

    公开(公告)日:1997-01-31

    申请号:HK9197

    申请日:1997-01-23

    Applicant: MOTOROLA INC

    Abstract: PCT No. PCT/US87/00002 Sec. 371 Date Feb. 27, 1987 Sec. 102(e) Date Feb. 27, 1987 PCT Filed Jan. 2, 1987 PCT Pub. No. WO88/05214 PCT Pub. Date Jul. 14, 1988.An antenna tuning apparatus for a portable communications device which includes a means of adapting the device to be worn on the body is described. The device consists of an antenna, tuning means and a receiver for receiving transmitted signals including a tuning mode signal. A decoder initiates antenna tuning when the tuning mode signal is detected. A tuning controller enables a carrier detection circuit to determine the magnitude of the received signals, and generates a tuning control signal supplied to a D/A converter to effect tuning of the antenna by monitoring the variations in the magnitude of the received signals.

    GLOBAL COMMUNICATION SYSTEM, RECEIVER AND METHOD FOR OPERATING THE SAME

    公开(公告)号:CA2066712C

    公开(公告)日:1996-09-24

    申请号:CA2066712

    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.

    27.
    发明专利
    未知

    公开(公告)号:DE3853996T2

    公开(公告)日:1996-02-15

    申请号:DE3853996

    申请日:1988-03-24

    Applicant: MOTOROLA INC

    Abstract: A personal communications device is described including a receiver (16), intended to be worn on the body, which receives, detects and stores messages transmitted on a first communication channel (14). The stored message is then transmitted over a second communications channel (20) to a second receiver (22) which is intended to be worn on the wrist. The second receiver (22) receives, detects and stores the message, and presents the message to the user in the form of a visual display. A system transmitting synchronization signals and coded message signals is also described. In particular, coded synchronization signals are used to indicate the transmission of coded message signals or the absence of transmission of coded message signals following the transmission of the coded synchronization signal, thereby providing a battery saving function for a personal communications receiver.

    28.
    发明专利
    未知

    公开(公告)号:DK0464142T3

    公开(公告)日:1995-09-04

    申请号:DK90905867

    申请日:1990-02-27

    Applicant: MOTOROLA INC

    Abstract: A paging receiver having acknowledge back capability is provided with the capability to request a received message to be forwarded to an alternate paging receiver in a paging system after having received its address and associated message. The paging receiver includes an entry device for selecting the alternate paging receiver to which the message is further to be sent, and after the selection is made, the paging receiver generates the acknowledge back response requesting the message be further sent to the selected alternate paging receiver.

    Single turn ferrite rod antenna and method for mounting such

    公开(公告)号:GB2286292A

    公开(公告)日:1995-08-09

    申请号:GB9506854

    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) is 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 (40) of the sleeve (14), interconnecting posts, tapered core projection interegaging 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.

    GLOBAL SATELLITE COMMUNICATION SYSTEM WITH GEOGRAPHIC PROTOCOL CONVERSION

    公开(公告)号:AU6427990A

    公开(公告)日:1991-05-31

    申请号:AU6427990

    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.

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