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Technical Paper

A Millimeter Wave, Wireless, LAN for Use Inside an Aircraft

1994-11-01
942554
A Millimeter Wave, Wireless, Local Area Network has been built for use in distributing digital data inside an aircraft. To avoid interference with existing VHF and Microwave transmitters and receivers, the transmitters operate at 60.60 Ghz and 60.54 Ghz. This region of the Millimeter Wave Spectrum has high attenuation being the resonant frequency of local oxygen atoms. This isolates the wireless links from most interference. The transceivers employ V-Band Gunn Diode Voltage-Controlled Oscillators. The maximum range is 150 meters. The network boards have been optimized for Mil-Spec-1553 type digital messages. A wide variety of other digital formats can be supported from 200 Khz up to video rates, but analog video sent through the system was too noisy for conventional television receivers. This paper describes the rationale, the system requirements, the development, the final design, and the test results.
Technical Paper

Switched Linear Induction Motor Freeway System Data

1993-08-01
931799
A hybrid conventional drive/electric car has been built that does not use batteries, a motor, or controls. In the purely electric mode, it is pulled by an independently suspended tractor plate that is lowered to within 5/16ths of an inch of a set of buried, switched, linear induction motors. These motors are turned on when the vehicle is approaching, and operate with pulse population modulation at a speed commanded by the driver through an infrared link connected to a computer. Prototype speeds of 38.62 km/h for a 906 kg vehicle are contemplated. The motors ultimately can provide speeds necessary for freeway driving, but also must be able to bear the vertical loads associated with lane-changing and non-compatible traffic rolling over the motors. The top level system requirements are discussed in a general manner. Pictures of the motor, tractor, and vehicle, etc. are shown.
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