US 4,607,389 AGranted

Communication system for transmitting an electrical signal

AssigneeAmoco Corporation

InventorEdwin A. Halgrimson

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Abstract

The present invention is a communication system for transmitting an electrical signal from a transmission tower and includes a first transceiver located adjacent the base of the tower and which is in communication with a source of an electrical signal which is to be transmitted. An enclosure is removably located adjacent the top of the tower and includes a second transceiver for receiving the transmitted electrical signal from the first transceiver and a third transceiver for retransmitting the electrical signal from the tower. By this arrangement there is no need for stringing coaxial cable from a ground based transmitter to the antenna mounted to the top of the tower, thereby eliminating the power loss associated with the use of such coaxial cable. In one embodiment of the present invention, the second and third transceivers are conveyed to and from the top of the tower via a pulley arrangement for maintenance purposes, and in an alternate embodiment, the second and third transceivers are enclosed within a housing and are conveyed to and from the top of the tower within a conduit by means of compressed air.

Claims6

Dependent claims

A communication system for transmitting an electrical signal, comprising:

an operational device;
a remote terminal unit connected to said operational device for sending an electrical signal;
an elongated, substantially upright, transmission tower having a base providing a bottom in proximity to the ground and an upper portion providing a top spaced substantially above said base;
a stationary first transceiver fixedly secured and mounted near said base of said transmission tower for receiving said electrical signal from said remote terminal unit;
a first antenna connected to said first transceiver;
said first transceiver having a ground based stationary transmitter for radiating said electrical signal through said first antenna;
a second transceiver having a receiver;
a second antenna connected to and extending below said receiver of said second transceiver for receiving said electrical signal from said first antenna of said first transceiver and for passing said electrical signal to said receiver of said second transceiver in the absence of a coaxial cable connecting said first transceiver to said second transceiver;
a third transceiver cross-coupled to and positioned above said second transceiver, said third transceiver having an aboveground transmitter for transmitting said electrical signal from the receiver of said second transceiver to another remote terminal unit;
a third antenna connected to and positioned above said third transceiver for radiating said electrical signal from said aboveground transmitter of said third transceiver to said remote terminal unit;
a moveable enclosure substantially enclosing said second transceiver including said receiver and said third transceiver including said aboveground transmitter;
and
conveying means for conveying said moveable enclosure containing said second and third transceivers, from said base of said tower to said top of said tower.

10 more elements

Dependencies are inferred from the claim text.