Device for increasing the safety with respect to transmission fa

Details Device for increasing the safety with respect to transmission fa Device for increasing the safety with respect to transmission fa

1977-03-11

1978-10-17

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 65LC, G01S 956

Patent

active

041212088

ABSTRACT:
A device for increasing security with respect to transmission faults in an information transmission system, particularly for the railroad field, in which an interrogation device and a passive response device are movable relative to one another, and the interrogation device transmits an interrogation signal, which can be periodically swept through a predetermined frequency band, preferably in the microwave range, and which during a read operation, receives during several periods from the passive response device, a frequency-selectively reflected interrogation signal, in accordance with a k-digit information item to be transmitted, which signal forms the response signal in which the interrogation device is provided with means for amplifying each response signal, until there is reached a predetermined threshold level of the low-frequency portions of the response signals, which are below the frequency of the periodic interrogation sweep, with the amplification that the low-frequency portions thereafter being so reduced that they do not undesirably exceed the threshold value, and means being provided for preventing a through-connection of a transmitted information item in the presence of a decreasing and/or increasing level of such low-frequency portion.

REFERENCES:
patent: 3863244 (1975-01-01), Lichtblau
patent: 3969725 (1976-07-01), Couvillon et al.
patent: 4037227 (1977-07-01), Kline

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