Spread spectrum radio transmission system
Patent 4641317 Issued on February 3, 1987. Estimated Expiration Date: 
December 3, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 3, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3806795 Quantized pulse modulated nonsynchronous clipped speech multi-channel coded communication system Delay-modulated random energy intelligence communication system Pulse modulator using capacitor charging and discharging circuits Patent #: 4380746 InventorAssigneeApplicationNo. 06/677597 filed on 12/03/1984US Classes:375/130, SPREAD SPECTRUM375/239, PULSE POSITION, FREQUENCY, OR SPACING MODULATION375/367Pseudo noiseExaminersPrimary: Griffin, Robert L.Assistant: Chin, Stephen Attorney, Agent or FirmInternational ClassesH04B 14/02 (20060101)H04B 1/69 (20060101) H01Q 21/06 (20060101) H01Q 9/28 (20060101) H01Q 9/04 (20060101) AbstractA communications system wherein an intelligence signal modulates the spacing of relatively narrow pulses of a fixed rate pulse train, and these pulses key on a transmitter which employs a pair of series connected avalanche mode operated transistors. These are repetitively powered via a charged coaxial delay line, and the output, appearing across a resistive load, is fed directly, or through a shaping filter, to a discone transmitting antenna. At a receiving location, the received signal is amplified by a wide band amplifier and fed through a reverse contoured filter (of the transmitting filter, if one is employed). The signal is detected via synchronous detection which locks onto the received pulse train, after which the modulation evidence by the pulse train is recovered by a low pass filter.Other References
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