Data transmission system including an RF transponder for generat

Details Data transmission system including an RF transponder for generat Data transmission system including an RF transponder for generat

1974-07-25

1976-06-29

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 64, 325 65, 325131, 340152T, 343 68R, H04B 159, G01S 956

Patent

active

039672026

ABSTRACT:
A data transmission system for obtaining information from a plurality of data sources includes an interrogate source for transmitting RF interrogate signals to the locations of the data sources and a transponder associated with each data source for receiving the interrogate signals and for generating RF reply signals representing the information. The transponder includes a transmitter having a voltage controlled oscillator responsive to data signals at first and second levels to generate sinusoidal output signals at first and second frequencies, respectively, a wave shaping circuit which converts the output signals to sawtooth wave signals at the corresponding frequencies and an FM oscillator for providing a carrier signal which is modulated by the sawtooth signals to produce a broad spectrum of sideband signals of approximately equal amplitude.

REFERENCES:
patent: 2380959 (1945-08-01), Frankel
patent: 2422664 (1947-06-01), Feldman
patent: 2839604 (1958-05-01), Shank
patent: 3058065 (1962-10-01), Freeman et al.
patent: 3493865 (1970-02-01), Miller
patent: 3705385 (1972-12-01), Batz

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