Telecommunications – Transmitter and receiver at separate stations – Earth or water medium
Patent
1995-10-19
1998-08-11
Le, Thanh Cong
Telecommunications
Transmitter and receiver at separate stations
Earth or water medium
455128, 219210, 331 69, 441 32, H04B 1302
Patent
active
057941262
ABSTRACT:
An emergency positioning indication radio buoy used in case of emergency by being thrown into the sea from a ship. This radio buoy comprises a transmitting unit for generating a high frequency signal of a predetermined frequency, a battery for supplying the power to the transmitting unit, a switch which is normally breaking the power supply circuit from the battery to the transmitting unit and operates automatically or is operated by hand to make the circuit when the buoy is used, and an antenna for radiating the high frequency signal from the transmitting unit into the air, and is characterized by that at least the crystal resonator of said transmitter unit is put in a heat insulating container which is enclosed with a vacuum or a heat insulating material and that an antifreezing solution, oil or other appropriate material is filled in the heat insulating container. The radio buoy may further comprise a heating means disposed in the heat insulating container for generating heat when an electric current is made to flow through, a heat sensing and current controlling means for detecting temperature changes in the material filled in the heat insulating container and controlling the electric current flowing through the heating means, and a non-contact power receiving means for receiving the electric power from an external power source.
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patent: 4981453 (1991-01-01), Krishan et al.
patent: 5025228 (1991-06-01), Gerard et al.
patent: 5076103 (1991-12-01), Lagen et al.
patent: 5218366 (1993-06-01), Cardamone et al.
Ono Kazuhiko
Tsutsumi Masayuki
Cong Le Thanh
Toyo Communication Equipment Co., Ltd.
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