Method and apparatus for signalling

Details Method and apparatus for signalling Method and apparatus for signalling

H - Electricity

04

B

H04B 3/56 (2006.01) H02J 13/00 (2006.01) H04B 3/54 (2006.01) H04L 5/06 (2006.01) H04L 5/14 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2084403

2084403 9119360 PCTABS00008 Apparatus for coupling signals between a network of low but unknown impedance and a transceiver comprises a series resonant circuit (31, 32) terminated with a high impedance and a parallel resonant circuit (36, 37) terminated with a low value resistor (38). A power amplifier (39) is provided for transmitting and switching means (34) to switch between the two circuits. The signal is monitored to produce an appropriate signal level for coupling to the network. A particular use of this apparatus is in electricity supply to read meters. Polling messages are transmitted from a substation to a plurality of meters with the phase of the data bit timing maintained between transmitters and in the response from the meters. Transmission of the signals with high immunity to noise and narrow bandwidth is achieved by complex phase modulation of the carrier. A binary phase shift keyed signal produces signals with a bandwidth less than the frequencies allocated to metering applications and interference between signals can be avoided by frequency division multiplexing.

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