Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-09-20
1977-11-01
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343100CS, H04B 100, H04B 360
Patent
active
040567818
ABSTRACT:
A ground station system for automatically monitoring a predetermined plurality of carrier frequencies for radio communication calls from aircraft which transmit and receive traffic over one of said carrier frequencies, wherein the aircraft transmits a calling code signal for a selected ground station, and each of the ground stations has a separate receiver for each of said carrier frequencies. Each receiver is connected to a decoding device which detects only complete and correct calling code signals for that particular ground station. In addition to each of the calling code signals having a first calling part for the pre-selected ground station, each calling code signal also may have a second or an information part indicating the direction sector of the aircraft with respect to the called ground station, the way of modulation or modulation scheme, e.g. A-M or S.S.B., and the company or party being called at that station. If the calling code contains the second or information part, the decoding device not only detects complete and correct code signals of the second part, but also automatically connects that transmitter at the ground station which transmits on the same carrier frequency and in the requested mode, as well as automatically switches the directional antennas for both the receiver and transmitter of that carrier frequency toward the sector in which the transmitting or calling aircraft is located. Once the complete and correct calling signal has been received, its receiver at that ground station is blocked from receiving further calls until the information in the calling signal has been processed and the called party connected, and further until the called party disconnects it.
REFERENCES:
patent: 3859475 (1975-01-01), Wulfsberg et al.
patent: 4007422 (1977-02-01), DA Silva
Hetebrij Albert
Kloeck Cornelis Adrianus Geertrudis
Bookbinder Marc E.
De Staat der Nederlanden, te Dezen Vertegenwoordigd Door de
Griffin Robert L.
Kirk Hugh A.
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