Abstract: The present invention discloses a frequency down converter for a multichannel multipoint distribution service (MMDS) television (TV) signal transmission and receiving system. The down converter system includes a separate address module for controlling signal reception for a subscriber according to a subscribing status carried by radio frequency signals transmitted from a signal transmission station. The address module includes a module container for containing a main circuit assembly therein. The down converter further includes a F-type connector for screwing onto the main circuit assembly through a connector opening of the module container for establishing an electric contact and for mechanically pulling the electric circuit assembly for sealing another opening on the module container.

Abstract: A document moving transmission system for an optical scanner to drive the window assembly of a document moving optical scanner is disclosed. The transmission system consists several mechanism to account for providing the driving force, converting rotation into linear motion, performing the sliding motion with the window assembly, adjusting and maintaining flatness of the window assembly over the light transmitting slot inside the optical scanner housing.