Communications – electrical: acoustic wave systems and devices – Transponders – Sonobuoys and sonobuoy systems
Patent
1986-12-15
1988-06-14
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Transponders
Sonobuoys and sonobuoy systems
367134, 367 3, H04B 1100, H04L 2502
Patent
active
047516852
ABSTRACT:
A cable driver and method for an underwater telemetry transmitter puts a signal on a single insulated wire forming part of a cable pack in which the wire is coiled and which is connected to a surface transmitting unit. The underwater transmitter includes an amplifier having an input, directly, time division multiplexed or digitally encoded from one or more hydrophones and an output into the primary winding of a toroidal transformer having a center hole through which the cable passes as it is deployed from the cable pack. The cable also passes through a similar toroidal transformer whose winding is connected to provide a feedback signal to the input of the amplifier. Since the insulated wire may be of greatly varying length and the cable pack may have greatly varying numbers of turns, the load impedance and resulting noise also vary and the above described arrangement makes the signal on the wire substantially independent of the variable load. A seawater ground is relied upon to close the loop between the surface transmitting unit and the opposite end of the cable at the cable pack.
REFERENCES:
patent: 2322264 (1943-06-01), Turner, Jr.
patent: 4099022 (1978-07-01), Fullerton et al.
patent: 4189703 (1980-02-01), Bennett
patent: 4323988 (1982-04-01), Will et al.
Marshall Norman P.
Moll John J.
Allied Corporation
Pihulic Daniel T.
Tarcza Thomas H.
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