System for automatic meter reading
AssigneeAdvanced Technology Ramar Limited
InventorTerence George Giles
Life of this patent
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Abstract
A fixed network AMR system that has a range from the meter (4) to the node (6) of up to 5 km uses a common reference source (2) for the frequency reference of the meter transmitter (12) and the system receiver (18). By using a publicly available reference frequency the necessary frequency stability can be obtained in order to provide a signal to noise bandwidth of the order of 32 Hz.
Claims4
A fixed network AMR system comprising a plurality of meters and nodes, each meter having a transmitter for transmitting data to at least one node, each node having a data receiver for receiving transmissions from meters within range of the node, wherein each meter and each node has a local oscillator and a reference receiver for receiving a common frequency reference signal as transmitted by a public source, said common signal providing a reference frequency for the local oscillators used by the meter data transmitters and the node data receivers.
Dependencies are inferred from the claim text.