Abstract: The invention relates to a transponder system for use in conjunction with an interrogator of a toll highway, which comprises: (a) a transponder having two modes: (a.1) an “active” mode during which the transponder is mostly in standby, while it sends an identification signal upon receipt of an interrogator signal; and (a.

Abstract: The invention relates to a system for providing a combined monitoring over a toll-container sealing, weighing-container sealing, or border crossing-container sealing, which comprises: (a) a plurality of combined toll-seal, weighing-seal or border crossing-seal interrogators, which are mounted along highways, said interrogators transmitting a same interrogating signal in a same standardized communication protocol and at the same operating frequencies, by all interrogators; (b) a plurality of toll, weighing, or border crossing, whichever is the case, transponders which are installed in vehicles, and a plurality of container sealing transponders which are installed in containers, said sealing transponders by receiving interrogation signal transmit a sealing response signal which is distinct from corresponding toll, weighing, or border crossing response signals transmitted by toll, weighing, or border crossing transponders; (c) decoding means within each interrogator for receiving and decoding response signals, a

Abstract: A Vehicle Location Unit (VLU) device includes in functional relationship an RF receiver, a transmitter, a receive/transmit switch, a microcontroller to control the receiving/transmitting path, a digital Large Scale Integration (LSI), having a digital signal processing device, a crystal oscillator, and a filtering device for an outcoming signal.