DE2531148

An answering device in a system for automatic wireless transmission of an item of information coded by a plurality of frequencies is disclosed herein. An interrogation device movable with respect to the answering device transmits an interrogation signal having a frequency which periodically varies w...

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Bibliographic Details
Main Authors LAUFER, KARL, BECKER, FRIEDBERT, STEINKAMP, JAN
Format Patent
LanguageEnglish
Published 31.08.1978
Edition2
Subjects
ENSURING THE SAFETY OF RAILWAY TRAFFIC
GUIDING RAILWAY TRAFFIC
PERFORMING OPERATIONS
RAILWAYS
TRANSPORTING
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Summary:An answering device in a system for automatic wireless transmission of an item of information coded by a plurality of frequencies is disclosed herein. An interrogation device movable with respect to the answering device transmits an interrogation signal having a frequency which periodically varies within a predetermined microwave frequency band. The answering device has a plurality of microwave resonators, each of which has a fixed frequency. A microwave diode is coupled to each of the resonators for preventing a response to the interrogation signal by either damping or detuning the resonator fixed frequency when a control voltage is applied. The control voltage means connected to each of the microwave diodes switches certain of the resonators to an inoperative condition to establish a set of frequencies at which the resonators will respond which corresponds to the information to be transmitted.
Bibliography:Application Number: DE19752531148