Abstract: A vehicle energy harvester including a subunit having an upper surface forming a roadway surface; a vehicle activated treadle on the subunit, the vehicle activated treadle moveable between a first position in which an upper surface of the treadle is at an angle with respect to the upper surface of the roadway surface and a second position in which the upper surface of the treadle is flush with the upper surface of the roadway surface; a generator that generates power in response to movement of the vehicle activated treadle; and a vehicle speed detection device that detects a speed of a vehicle travelling over the roadway surface based on a speed of movement of the vehicle activated treadle.

Abstract: A low-profile, surface mount vehicle energy harvester including a low-profile, surface mount subunit having an upper surface forming a roadway surface; a vehicle activated treadle on the subunit, the vehicle activated treadle moveable between a first position in which an upper surface of the treadle is at an angle with respect to the upper surface of the roadway surface and a second position in which the upper surface of the treadle is flush with the upper surface of the roadway surface; a generator that generates power in response to movement of the vehicle activated treadle; and an entry ramp at a first end of the harvester roadway surface; and an exit ramp at a second end of the harvester roadway surface.

Abstract: A vehicle energy harvester including a subunit having an upper surface forming a roadway surface; a vehicle activated treadle on the subunit, the vehicle activated treadle moveable between a first position in which an upper surface of the treadle is at an angle with respect to the upper surface of the roadway surface and a second position in which the upper surface of the treadle is flush with the upper surface of the roadway surface; a generator that generates power in response to movement of the vehicle activated treadle; and a treadle locking device that selectively locks the vehicle activated treadle in the second position.

Abstract: A passive, single cable, local area network system includes two directional couplers at each cable tap to provide bi-directional communications for each communications terminal. Each coupler introduces some amount of signal power loss through the cable such that the signal power level between any two communicating terminals depends on the cable distance between them, measured in number of intervening cable taps. Selectable attenuators are provided between the directional couplers and the corresponding communications terminals to virtually equalize the signal power level between any two terminals. The value of attenuation is selected according to a relationship including the number of cable taps in the system, the signal power loss along the cable introduced by each directional coupler, and the ordinal number of the corresponding terminal from the cable termination in the direction toward which the terminal's directional coupler communicates.