Method and apparatus for transmitting monitor data

Details Method and apparatus for transmitting monitor data Method and apparatus for transmitting monitor data

H - Electricity

04

Q

H04Q 9/00 (2006.01) G08C 15/00 (2006.01) G08C 17/02 (2006.01)

Patent

CA 2173061

A method and apparatus for transmitting data from a monitoring station using frequency hopping and interval hopping as described. The output frequency of a transmitter in the monitoring station is hopped between selected output frequencies by retrieving random numbers from a table, generating a control voltage corresponding to the retrieved random number, applying the control voltage to an RF oscillator and transmitting a signal from a transmitter in the monitoring station using the signal from the RF oscillator as a carrier. The output frequency of the transmitter is limited between a maximum output frequency and a minimum output frequency by comparing the retrieved random number to data limits stored in a memory in the transmitter and rejecting retrieved random numbers outside of the retrieved limits. Interval hopping is realized by selecting a random number from the random number table, multiplying the random number by a fixed increment and adding the product to a minimum time interval.

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