Abstract: A loading ramp and replacement tailgate mechanism provided for installation and use in pickup trucks and like vehicles to facilitate the loading of motorcycles. The assembly would replace the existing tailgate, extending the bed and using the same hardware as the tailgate. The ramp consists of two telescoping sections and provides for self contained storage of the ramp when installed. The ramp pivots on the new tailgate structure as the load moves upwards on the ramp and eliminates the change in angle as it occurs at the juncture of the inclined portion of the ramp and the truck bed. The device provides for load sharing between the truck bed and sides. The device allows for installation and removal from the truck by one person without the use of tools.

Abstract: An analog modulation technique where the message information is contained in the timing of phase reversal zero crossings in the transmitted signal. In the preferred implementation a bias signal is added to an information signal and the composite signal hard limited to produce a square wave. The square wave is used to switch the phase of a carrier signal so that phase reversals occur in correspondence with the change in polarities of the square wave. A demodulation technique is also disclosed.