Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-08-18
1977-08-02
Kunin, Stephen G.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
246122R, 246167R, 343 68R, 343 65SS, G01S 956
Patent
active
040400530
ABSTRACT:
A transponder system with ensured synchronization for a railway signalling system, comprising an interrogating station, from which an interrogation signal is transmitted continuously, and a responder station which is energized in response to the interrogation signal and repeatedly retransmits a coded information reply signal to the interrogating station; synchronization is achieved, by starting each information transmission by means of a predetermined start signal generated in the interrogating station as a result of a predetermined bit sequence retransmitted from the responder station. In normal operation the bit sequence is generated immediately after the retransmission of a message or word and indicates the end of this message. At the start of operation when initially the inquiry station and reply unit have bad coupling to each other, the predetermined bit sequence is generated when the amplitude of the interrogating signal received in the responder station exceeds a certain threshold level for starting-up the system.
REFERENCES:
patent: 3246322 (1966-04-01), Kuecken
patent: 3255900 (1966-06-01), Graham
patent: 3341845 (1967-09-01), Deman
patent: 3891963 (1975-06-01), Herbert, Jr.
patent: 3914762 (1975-10-01), Klensch
Kunin Stephen G.
Trifari Frank R.
U.S. Philips Corporation
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