Abstract: A system (100) for transmitting information from one of a plurality of originating processors A-N to at least a plurality of destination processors (A-N) which may be transported during operation in accordance with the invention includes at least one gateway switch (14), a gateway switch storing information received from one of the at least one originating processor prior to transmission of the information to the at least one destination processor; a RF information transmission network (302) for transmitting stored information received from one of the at least one gateway switch by RF transmission to at least one destination processor; at least one interface switch (304), an interface switch connecting a gateway switch to the RF transmission network and transmitting stored information received from one of the at least one gateway switch to the RF information transmission network; and wherein the information is electronic mail system in response to an address of the receiving interface switch which has been ad

Abstract: The invention is a method of data transmission. The method includes transmitting a first data transmission and a time delayed second data transmission which is identical to the first data transmission with the data transmissions modulating a subcarrier and each containing error correction code; receiving the first and second data transmissions; processing the the received first and second data transmissions to identify, by use of the error correction code, erroneous data within at least one of the first and second data transmissions; and replacing the identified erroneous data with non-erroneous data, which corresponds to the erroneous data from another of the first and second transmissions not containing the erroneous data, to produce a received data transmission not containing any erroneous data which is identical to the transmitted first and second data transmissions.

Abstract: The present invention provides a method for transmission of serial information over a wireless channel. The method includes modulating bits of information at selected parts of each cycle of a carrier waveform. At the receiving side, the selected parts of each cycle of the modulated waveform are integrated to produce an integrated value and compared with stored value to recover transmitted bits.

Abstract: An antenna assembly providing selectable omnidirectional or directional reception of radio transmissions in a frequency band in accordance with the invention includes an electrically conductive reflector (432) defining a cavity (702) having a bottom (708), an opening (714) and a surface (704 and 706) extending from the bottom to the opening and an electrical output (763); an electrically conductive loop (431) coupled to ground and having an electrical outlet (766) for coupling to an RF amplifier (407), the loop being positioned between the bottom opening of the cavity; a RF switch (406) having an input (760) and first and second outputs (762 and 764), the RF switch having a first switching state electrically connecting the input to the first output and a second switching state electrically connecting the input to the second output, the first switch output being electrically coupled to ground and the second switch output being electrically coupled to the output of the electrically conductive loop; and wherein

Abstract: A system (100) for transmitting information from one of a plurality of originating processors A-N to at least a plurality of destination processors (A-N) which may be transported during operation in accordance with the invention includes at least one gateway switch (14), a gateway switch storing information received from one of the at least one originating processor prior to transmission of the information to the at least one destination processor; a RF information transmission network (302) for transmitting stored information received from one of the at least one gateway switch by RF transmission to at least one destination processor; at least one interface switch (304), an interface switch connecting a gateway switch to the RF transmission network and transmitting stored information received from one of the at least one gateway switch to the RF information transmission network; and wherein the information is transmitted to a receiving interface switch by the electronic mail system in response to an address

Abstract: A system (100) for transmitting information from one of a plurality of originating processors A-N to at least a plurality of destination processors (A-N) which may be transported during operation in accordance with the invention includes at least one gateway switch (14), a gateway switch storing information received from one of the at least one originating processor prior to transmission of the information to the at least one destination processor; a RF information transmission network (302) for transmitting stored information received from one of the at least one gateway switch by RF transmission to at least one destination processor; at least one interface switch (304), an interface switch connecting a gateway switch to the RF transmission network and transmitting stored information received from one of the at least one gateway switch to the RF information transmission network; and wherein the information is transmitted to a receiving interface switch by the electronic mail system in response to an address

Abstract: The present invention provides reconstruction and resynchronization of wireless serial transmissions which are subject to fading causing erroneous uncorrectable bit errors exceeding the error correction code correction capacity present in frames of digitally encoded data. Valid data is reconstructed in frames which are determined to contain at least one erroneous uncorrectable bit exceeding the bit error correction capacity of the error correction code therein which have all erroneous uncorrectable bits within the error correction code bit held. A synchronization marker is transmitted with each frame group which does not represent any valid data in a frame. Detection of the synchronization marker by a digital signal processor after at least one frame is determined to contain at least one erroneous uncorrectable bit, which is indicative of a loss of synchronism of the receiving circuitry clock, resynchronizes the clock of a processor of the receiving circuitry.

Abstract: A system and method is disclosed for wireless transmission of information which is subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a bus interface which communicates with a digital signal processor which controls the transmitting and receiving circuitry functions. The bus interface is for connection to a computer bus which is connected to a computer which originates information to be transmitted by transmitting circuitry and which receives information from receiving circuitry. The digital signal processor provides first and second encoded information streams each comprising the information to be transmitted with the second stream being delayed by a time delay interval with respect to the first stream which is equal to or greater than the fading interval. The first and second encoded information streams modulate cycles of the subcarrier to produce first and second parallel information streams which are time offset by the time delay interval.

Abstract: The present invention provides reconstruction and resynchronization of wireless serial transmissions which are subject to fading causing erroneous uncorrectable bit errors exceeding the error correction code correction capacity present in frames of digitally encoded data. Valid data is reconstructed in frames which are determined to contain at least one erroneous uncorrectable bit exceeding the bit error correction capacity of the error correction code therein which have all erroneous uncorrectable bits within the error correction code bit held. A synchronization marker is transmitted with each frame group which does not represent any valid data in a frame. Detection of the synchronization marker by a digital signal processor after at least one frame is determined to contain at least one erroneous uncorrectable bit, which is indicative of a loss of synchronism of the receiving circuitry clock, resynchronizes the clock of a processor of the receiving circuitry.

Abstract: A radio receiver unit for directionally tracking at least one radio transmitter in accordance with the invention includes a housing containing a radio receiver including a directional antenna for receiving radio transmissions from the at least one radio transmitter; a display, which is electrically coupled to the receiver and fixed in position with respect to the housing, for visually displaying a strength of the radio transmissions received by the directional antenna; and a field of view limiter for limiting light emanating from the display to a field of view of the display when a user holds the receiver unit in the user's hand away from the body of the user, the field of view being limited to planes extending upward from a plane of sight extending from the eyes of the user downward and intersecting a horizontal plane extending from the user's waist substantially at arms length of the user.

Abstract: A method and radio receiver for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver. Each frequency hopping radio frequency transmitter periodically transmits an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter.

Abstract: A system and method is disclosed for transmission of information which is subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a bus interface which communicates with a digital signal processor which controls the transmitting and receiving circuitry functions. The bus interface is for connection to a computer bus which is connected to a computer which originates information to be transmitted by transmitting circuitry and which receives information from receiving circuitry. The digital signal processor provides first and second encoded information streams each comprising the information to be transmitted with the second stream being delayed by a time delay interval with respect to the first stream which is equal to or greater than the fading interval. The first and second encoded information streams modulate cycles of the subcarrier to produce first and second parallel information streams which are time offset by the time delay interval.

Abstract: An antenna assembly providing selectable omnidirectional or directional reception of radio transmissions in a frequency band in accordance with the invention includes an electrically conductive reflector (432) defining a cavity (702) having a bottom (708), an opening (714) and a surface (704 and 706) extending from the bottom to the opening and an electrical output (763); an electrically conductive loop (431) coupled to ground and having an electrical outlet (766) for coupling to an RF amplifier (407), the loop being positioned between the bottom opening of the cavity; a RF switch (406) having an input (760) and first and second outputs (762 and 764), the RF switch having a first switching state electrically connecting the input to the first output and a second switching state electrically connecting the input to the second output, the first switch output being electrically coupled to ground and the second switch output being electrically coupled to the output of the electrically conductive loop; and wherein

Abstract: A system and method is disclosed for wireless transmission of information which is subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a bus interface which communicates with a digital signal processor which controls the transmitting and receiving circuitry functions. The bus interface is for connection to a computer bus which is connected to a computer which originates information to be transmitted by transmitting circuitry and which receives information from receiving circuitry. The digital signal processor provides first and second encoded information streams each comprising the information to be transmitted with the second stream being delayed by a time delay interval with respect to the first stream which is equal to or greater than the fading interval. The first and second encoded information streams modulate cycles of the subcarrier to produce first and second parallel information streams which are time offset by the time delay interval.

Abstract: The present invention provides reconstruction and resynchronization of wireless serial transmissions which are subject to fading causing erroneous uncorrectable bit errors exceeding the error correction code correction capacity present in frames of digitally encoded data. Valid data is reconstructed in frames which are determined to contain at least one erroneous uncorrectable bit exceeding the bit error correction capacity of the error correction code therein which have all erroneous uncorrectable bits within the error correction code bit held. A synchronization marker is transmitted with each frame group which does not represent any valid data in a frame. Detection of the synchronization marker by a digital signal processor after at least one frame is determined to contain at least one erroneous uncorrectable bit, which is indicative of a loss of synchronism of the receiving circuitry clock, resynchronizes the clock of a processor of the receiving circuitry.

Abstract: A radio tracking and ranging system is disclosed which has at least one mobile radio frequency transmitter and a radio frequency receiver. The radio frequency receiver has a range control which sets a maximum range that each mobile radio frequency transmitter may be moved from the radio frequency receiver without generating an alert to the user of the radio frequency receiver. Each radio frequency transmitter has a "panic" switch which permits a user of the radio frequency transmitter to transmit an alert or alarm to the user of the radio frequency receiver. After receipt of an alert, the user of the radio frequency receiver switches the radio frequency receiver into a tracking mode for locating a direction from which a maximum signal strength is received which is indicative of the relative bearing of the radio frequency transmitter which is being tracked from the radio frequency receiver.

Abstract: A system (100) for transmitting information from one of a plurality of originating processors A-N to at least a plurality of destination processors (A-N) which may be transported during operation in accordance with the invention includes at least one gateway switch (14), a gateway switch storing information received from one of the at least one originating processor prior to transmission of the information to the at least one destination processor; a RF information transmission network (302) for transmitting stored information received from one of the at least one gateway switch by RF transmission to at least one destination processor; at least one interface switch (304), an interface switch connecting a gateway switch to the RF transmission network and transmitting stored information received from one of the at least one gateway switch to the RF information transmission network; and wherein the information is transmitted to a receiving interface switch by the electronic mail system in response to an address

Abstract: A system (100) for connecting a plurality of mail systems (1-N) each transmitting information from one of a plurality of originating processors (A-N) to at least one of a plurality of destination processors (A-N) which may be transported during operation in accordance with the invention includes at least one interface switch (304), an interface switch being coupled to each of the plurality of electronic mail systems of receiving information originating from an originating processor in one of the electronic mail systems for transmission to a destination processor in another electronic mail system; and a RF information transmission network (302), coupled to the at least one interface switch, for transmitting stored information received from one of the at least one interface switch originating from an originating processor in one electronic mail system by RF transmission to at least one RF receiver which relays the information to a destination processor within the another electronic mail system.

Abstract: A system and method for transmission of information subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a processor for providing first and second encoded information streams each comprising the information to be transmitted with the second stream being delayed by a time delay interval with respect to the first stream which is equal to or greater than the fading interval. The first and second information streams are modulated on cycles of the subcarrier to produce first and second parallel information streams. At least one receiver having a detector receives and detects the transmitted first and second parallel information streams. At least one processor determines if faded information is present in the detected first and second parallel information streams.

Abstract: A system for transmitting originated information from one of a plurality of originating processors in an electronic mail system to at least one of a plurality of destination processors in an electronic mail system in accordance with the invention includes a RF information transmission network for transmitting the originated information to at least one RF receiver which transfers the originated information to the at least one of the plurality of destination processors; at least one interface switch, the at least one interface switch being coupled to the electronic mail system containing the plurality of originating processors and the RF information transmission network and transmitting the originated information received from the electronic mail system containing the plurality of originating processors to the RF information transmission network; and at least one additional processor with each additional processor being coupled to at least one interface switch and transmitting other originated information to th