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公开(公告)号：HK7897A
公开(公告)日：1997-01-24
申请号：HK7897
申请日：1997-01-16
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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公开(公告)号：CA1306789C
公开(公告)日：1992-08-25
申请号：CA581803
申请日：1988-11-01
Applicant: MOTOROLA INC
Inventor： NELSON LEONARD E , LEONARDO VICTORIA A , GRANDFIELD WALTER J
Abstract: Apparatus and method is disclosed for automatically, or by selective response, call forwarding a message to one or more system pagers(12)which have an acknowledge back capability. In one embodiment, disclosed apparatus automatically forwards a message to another system pager upon the initially called pager failing to acknowledge back within a predetermined time period. Such other pager is determined from a set paging hierarchy list(42)included within the paging terminal apparatus itself. In another embodiment, wherein the system pagers have multiple acknowledge back response capability, a called pager(12)can request the received message be additionally call forwarded to one or more other system pagers in accordance with the particular acknowledge back response chosen by the called pager user.
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公开(公告)号：DE3850757T2
公开(公告)日：1995-03-09
申请号：DE3850757
申请日：1988-11-17
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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4.发明专利
公开(公告)号：CA2004236C
公开(公告)日：1993-11-16
申请号：CA2004236
申请日：1989-11-30
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J , MITTEL JAMES G , DAVIS WALTER L
Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.
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公开(公告)号：SG32478A1
公开(公告)日：1996-08-13
申请号：SG1995001228
申请日：1995-08-26
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
IPC: H04B1/28
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Patent Agency Ranking
公开(公告)号：ES2056093T3
公开(公告)日：1994-10-01
申请号：ES88119113
申请日：1988-11-17
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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公开(公告)号：DE3850757D1
公开(公告)日：1994-08-25
申请号：DE3850757
申请日：1988-11-17
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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公开(公告)号：AT108968T
公开(公告)日：1994-08-15
申请号：AT88119113
申请日：1988-11-17
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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公开(公告)号：CA1287379C
公开(公告)日：1991-08-06
申请号：CA581816
申请日：1988-11-01
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J
Abstract: A paging system is provided having page transmission means (15) responsive to a message origination device (12) for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the corresponding paging signal. A plurality of transceivers (18) are provided responsive to the selective call paging signals and messages, and further responsive to the query signals for enabling the generating and transmitting of a response signal. Receivers (20) are provided for receiving the transmitted response signals. The received response signals are then delivered to the message origination device from which the original message originated.
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10.发明专利
公开(公告)号：CA2004236A1
公开(公告)日：1990-07-25
申请号：CA2004236
申请日：1989-11-30
Applicant: MOTOROLA INC
Inventor： GRANDFIELD WALTER J , MITTEL JAMES G , DAVIS WALTER L
Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.
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