ELF communications system using HVDC transmission line as antenn

Details ELF communications system using HVDC transmission line as antenn ELF communications system using HVDC transmission line as antenn

1975-05-19

1976-11-23

Caldwell, John W.

Communications: electrical

Systems

Selsyn type

343905, H04M 1104

Patent

active

039939898

ABSTRACT:
An extremely low frequency (ELF) Communication System is disclosed for worldwide communication from land to receiving stations thousands of miles away using the existing DC power transmission lines of the Pacific Intertie power transmission system as the antenna. An ELF communication system requires a very long uninterrupted antenna or a series of long parallel antennas. The transmission lines of the Pacific Intertie DC power system lend themselves to be used as the required long antenna for the disclosed ELF system. The DC lines together with the associated ELF transmitter and coupling devices comprise the global ELF communication system disclosed herein.

REFERENCES:
patent: 786925 (1905-04-01), Trump
patent: 1698770 (1929-01-01), Ohl
patent: 2032360 (1936-03-01), Green
patent: 2398741 (1946-04-01), Halstead
patent: 2515663 (1950-07-01), O'Brien
patent: 2977417 (1961-03-01), Doelz et al.
patent: 3623160 (1971-11-01), Giles
patent: 3641536 (1972-02-01), Prosprich
patent: 3904966 (1975-09-01), Firman
Intake Magazine, "The How of the Big Switch to Direct Current", Apr. 1970.

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