Combined isolating and neutralizing transformer

Claim 2

A combined neutralizing and isolation transformer having its windings wound on a single core, said core comprising a central leg and a pair of outer legs, a first winding wound about said central leg, a second winding wound about said central leg, said second winding comprising a twisted pair of conductors, one of said conductors being wound about one outer leg, the other of said conductors being wound about the other outer leg, the free ends of said conductors being connected together and an isolating winding on each outer core, one of the isolating windings having one of its ends connected to one end of the other of the isolating windings, the other ends of the isolating windings adapted to provide a communication output takeoff.

Claim 3

A transformer as set forth in claim 1, wherein the free ends of conductors connected together and the connected ends of the isolating windings include means for providing a common ground connection.

Claim 4

A combined neutralizing and isolation transformer having its windings wound on a single core; said core comprising a central leg and a pair of outer legs; said central leg having a plurality of windings thereon forming a neutralizing transformer section and defining with said outer legs two flux paths for flux at power frequencies, this flux being divided into two portions, said portions being directed respectively in the same directional sense through respective ones of said outer legs; each said outer legs having a plurality of windings thereon forming an isolating transformer section, said two outer legs defining with other portions of said single core a closed flux path for flux at signal frequencies above the power frequencies, said central leg being substantially free of flux at frequencies above the power frequences; wherein said plurality of windings on said outer legs include a first pair of windings serially connected, each disposed on separate ones of said outer legs and connected to one of said windings on said central leg, and a second pair of windings one end of which is serially connected to one another and the other end providing a pair of output points; and wherein said plurality of windings on said central leg includes a primary winding and a plurality of input windings, each said input winding comprising a cable having a twisted pair of conductors, each conductor of a pair being wound about one of said outer legs to provide corresponding pairs of windings for each input winding.

Claim 5

A combined neutralizing and isolation transformer having its windings wound on a single core; said core comprising a central leg and a pair of outer legs; said central leg having a plurality of windings thereon forming a neutralizing transformer section and defining with said outer legs two flux paths for flux at power frequencies, this flux being divided into two portions, said portions being directed respectively in the same directional sense through respective ones of said outer legs; each said outer legs having a plurality of windings thereon forming an isolating transformer section, said two outer legs defining with other portions of said single core a closed flux path for flux at signal frequencies above the power frequencies, said central leg being substantially free of flux at frequencies above the power frequences; wherein said plurality of windings on said outer legs include a first pair of windings serially connected, each disposed on separate ones of said outer legs and connected to one of said windings on said central leg, and a second pair of windings one end of which is serially connected to one another and the other end providing a pair of output points; and wherein said plurality of windings on said central leg includes a primary winding and a plurality of input windings, each said input winding comprising a cable having a twisted pair of conductors, each conductor of a pair being wound about one of said outer legs to provide corresponding pairs of windings for each input winding.

Claim 6

A transformer as set forth in claim 3, wherein each said corresponding pair of windings includes means for providing a common ground connection.

Claim 7

A combined neutralizing and isolation transformer comprising a single core having a central leg and at least two other legs, a first winding wound about said central leg, a plurality of input windings wound about said central leg, each said input windings comprising turns of a twisted pair of wires, one wire of each twisted pair being wound about one of the other legs, the other wire of each twisted pair being wound about the other of the legs and means for joining each winding formed by the wires to provide series connected windings and an isolating winding on each outer core, said isolating windings having one of their ends joined together effectively placing the windings in series and the other of their ends providing an output connection.

Claim 8

A combined neutralizing and isolation transformer comprising a single core having a central leg and at least two other legs, a first winding wound about said central leg, a plurality of input windings wound about said central leg, each said input windings comprising turns of a twisted pair of wires, one wire of each twisted pair being wound about one of the other legs, the other wire of each twisted pair being wound about the other of the legs and means for joining each winding formed by the wires to provide series connected windings and an isolating winding on each outer core, said isolating windings having one of their ends joined together effectively placing the windings in series and the other of their ends providing an output connection.

Claim 9

A transformer as set forth in claim 5, including at least a pair of output channels, means for connecting the output channels to the output connection including separate filter means for passing the carrier frequency and intelligence adapted to be applied to the input windings.

Claim 10

A transformer as set forth in claim 6, including means for connecting joined ends of the windings to ground.