Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
220 words
A radio broadcast system comprising: a base transmitter/receiver including transmitting means for transmitting a first reference signal of a first frequency, and transmit/receive means for transmitting and receiving respective second data modulated signals of frequencies which are a multiple of the reference frequency, said base transmitter/receiver including a store loop antenna disposed with its effective loop plane horizontal; and at least one receive/transmit module for receiving the first reference signal and for receiving and transmitting the respective second data modulated signals, each receive/transmit module comprising: a module body; receiving means mounted in the module body for receiving the first reference signal; receiving/transmit means mounted in the module body for receiving a respective second data modulated signal and for transmitting a respective second data modulated signal from the module; said receiving means comprising: a first high Q ferrite-cored loop antenna coil mounted in the module body with its effective loop plane disposed in a respective first plane; and said receive/transmit means comprising a second low Q air-cored antenna coil mounted in the module body with its effective loop plane disposed in a respective second plane orthogonal to the said first plane to minimize the coupling between the two antennae; the said first and second antennae being disposed with their respective effective loop plane inclined at a small angle to the vertical.
Claim 2
Dependent Claim
220 words
A radio broadcast system comprising: a base transmitter/receiver including transmitting means for transmitting a first reference signal of a first frequency, and transmit/receive means for transmitting and receiving respective second data modulated signals of frequencies which are a multiple of the reference frequency, said base transmitter/receiver including a store loop antenna disposed with its effective loop plane horizontal; and at least one receive/transmit module for receiving the first reference signal and for receiving and transmitting the respective second data modulated signals, each receive/transmit module comprising: a module body; receiving means mounted in the module body for receiving the first reference signal; receiving/transmit means mounted in the module body for receiving a respective second data modulated signal and for transmitting a respective second data modulated signal from the module; said receiving means comprising: a first high Q ferrite-cored loop antenna coil mounted in the module body with its effective loop plane disposed in a respective first plane; and said receive/transmit means comprising a second low Q air-cored antenna coil mounted in the module body with its effective loop plane disposed in a respective second plane orthogonal to the said first plane to minimize the coupling between the two antennae; the said first and second antennae being disposed with their respective effective loop plane inclined at a small angle to the vertical.
Claim 3
Dependent Claim
91 words
A system as claimed in claim 1, and including a metal shelf unit having a plurality of metal shelves each with a respective edge for the mounting of modules thereon, wherein the store loop antenna is mounted upon a surface of the shelf unit for electromagnetic coupling therewith and produces a magnetic transmission field in the vertical plane, and wherein the module is mounted on a shelf edge at said small angle to the vertical, said electromagnetic coupling increasing the transmission efficiency between the store loop antenna and the module antennae.
Claim 4
Dependent Claim
66 words
A system as claimed in claim 1 or 2, wherein the effective loop planes of the two coils are rectangular and are disposed with their longer sides parallel to one another, and wherein the first ferrite-cored coil is disposed centrally within the loop of the second air-cored coil so as to have its longer sides spaced equally from the corresponding longer sides of the second coil.
Claim 5
Dependent Claim
33 words
A system as claimed in claim 1 or 2, wherein the frequency range of said receiving means and said receive/transmit means mounted in the module body is from 10 kHz to 500 kHz.
Claim 6
Dependent Claim
62 words
A system as claimed in claim 1 or 2, wherein the frequency range of said receiving means and said receive/transmit means mounted in the module body is from 10 kHz to 500 kHz, and wherein the second data modulated signals are modulated by a digital modulating signal and are transmitted at a frequency which is less than that of the reference frequency.
Claim 7
Dependent Claim
63 words
A system as claimed in claim 1 or 2, wherein the frequency range of said receiving means and said receive/transmit means mounted in the module body is from 10 kHz to 500 kHz, and wherein the second data modulated signals are phase modulated by a digital modulating signal and are transmitted at a frequency which is less than that of the reference frequency.
Claim 8
Dependent Claim
39 words
A system as claimed in claim 1 or 2, wherein the module is a data display module and includes data display means connected to said receive/transmit means and displaying data contained in a respective received second data modulated signal.