Abstract: An antenna system for a communication receiver (100) which has an internal antenna (200) and which is coupled to a portable computer (104) to deliver received data messages thereto comprises a resonant loop antenna (16) magnetically coupled to the internal antenna (200) of the communication receiver (100), and a resonant wireframe shield (18, 40) which is coupled to the resonant loop antenna (16) and oriented perpendicular thereto. The resonant wireframe shield (18, 40) shields the communication receiver (100) from an electrical interference signal generated by the portable computer (104).

Abstract: A selective call receiver (100) comprises a receiver (104) for receiving a message and a vibrator (116) capable of vibrating at a selected one of at least two selectable frequencies for alerting a user of a received message. The vibrator (116) also has a selector (120) or a tuning element (130) for varying the frequency of the vibrator (116).

Abstract: A method and apparatus for generating an output signal (616) having a pre-determined frequency shift relative to the frequency of a reference signal from a reference frequency generator (202) comprise a digital phase-locked loop (206) coupled to the reference signal for generating the output signal (616). The method and apparatus further comprise adding pulses to the reference signal in a pulse addition circuit (304), the pulses recurring at a first cyclical rate determined by a microprocessor (702). The method and apparatus further comprise concurrently subtracting pulses from the reference signal in a pulse subtraction circuit (302) at a second cyclical rate.

Abstract: An optically readable matrix (100) has four intersecting sides of approximately equal length defining a perimeter and includes a binary code formed from light and dark squares of substantially equal sizes located within the perimeter. The matrix (100) comprises first and second orientation squares (105, 110) included in the light and dark squares and located in opposite corners of the matrix (100). Each of the orientation squares (105, 110) preferably includes a contrasting circular area (115, 120) located in a predetermined position within the orientation square (105, 110) and having a predetermined size relationship with the orientation square (105, 110). Such a matrix (100) may be formed on a printed circuit board (505) for use in an electronic device (500) to convey information about the printed circuit board (505). An apparatus (600) for decoding the matrix (100) includes an optical scanner (610) for scanning the matrix (100) and for locating the orientation squares (105, 110).

Abstract: This invention provides an indication of quality of signal reception in a selection call system such as a paging system, by comparing received data with preprogrammed data and indicating the degree of discrepancy therebetween.

Abstract: A selective call terminal receives selective call information from a message originator. A transmission time is scheduled for the selective call message by a selective call system controller. A plurality of simulcast schedulers coupled to the controller receive and store the selective call message and the transmission time. The simulcast schedulers have an equalization time stored therein, the equalization times for each of the simulcast schedulers calculated by the system controller using simulcast receivers for measuring signal time differences between transmitters. The simulcast schedulers provide the selective call message to corresponding transmitters at a time to transmit the selective call message, the time determined by the transmission time and the equalization time. Transmitter settings and code types defining signalling protocol, data bit rate, carrier frequency and transmitter power, for each message are varied in accordance with information received from the system controller.

Abstract: A satellite communication system (1110) provides geographic protocol conversion for message delivery between communication transceivers (1118, 1118') operating within at least two geographic areas (1116, 1116'). The satellite based communication system (1110) comprises a first communication transceiver (1118) which provides two-way message delivery within a first radiotelephone network (1114) located within at least a first geographic area (1116), the two-way message being encoded in a first predetermined message transmission protocol. The first communication transceiver (1118) further enables two-way message delivery with a communication satellite (1120), the message also being encoded in the first predetermined message transmission protocol.

Abstract: A method and apparatus are provided for synchronizing over-the-air time division duplexing communication within a defined geographical coverage area (201) of a communication system (200) that provides at least cordless radiotelephone operation between a plurality of portable radiotelephone transceivers and a plurality of telepoint base stations (202, 204, 206) geographically located within the coverage area (201). The communication system (200) transmits over-the-air a synchronization timing signal (203) including timing information corresponding to a transmit-and-receive duty cycle timing for time division duplexing communication. At least one telepoint base station (204, 206) within the coverage area (201) receives the synchronization timing signal (203). The at least one telepoint base station (204, 206) synchronizes its over-the-air time division duplexing communication transmit-and-receive duty cycle timing to the timing information.

Abstract: A selective call receiver comprises a receiver for receiving a signal, the signal comprising an address identifying the selective call receiver, a first information packet having a first information format, a second information packet having a second information format, and a control character. An output device presents the first information packet in a first output mode corresponding to the first information format in response to the control character, and the second information packet in a second output mode corresponding to the second information format in response to the address or a second control character.

Abstract: A paging receiver (15) for receiving secure radio frequency (RF) communications comprises a receiver circuit (102) for receiving and demodulating a signal to obtain information. A memory device (108) is coupled to the receiver circuit (102) for storing the information. A de-encrypter (110) is coupled to the memory device (108) for de-encrypting the information and a decoder (112) is coupled to the de-encrypter (110) for decoding the de-encrypted information to derive a message. User input controls (120) selectably generate a user input signal. A controller (114) is coupled to the memory device (108) and the user input controls (120) for causing the memory device (108) to provide the information stored therein to the de-encrypter (110) in response to the user input signal being equivalent to a predetermined de-encryption signal.

Abstract: In a selective call receiver (110) for receiving selective call messages, a method for generation and notification of tag information comprises the steps of receiving (310) a selective call message and generating (345, 355) tag information in response to receiving the message. A further step includes providing (350) the tag information to an interface (250) for coupling to an exterior electronic device (410).