Method of making twisted pairs of insulated metallic conductors for transmitting high frequency signals

A method of making a twisted, electrically matched pair of insulated metallic conductors, said method comprising the steps of:

• applying a substantially non-porous insulating material and surface colorant to first and second successive portions of a length of elongated metallic material to provide a length of insulated metallic conductor;
• causing relative motion between the length of insulated metallic conductor and a source of colorant materials along a path of travel in a direction along the longitudinal axis of the insulated metallic conductor;
• while
• directing a spray pattern of a first colorant material toward the first portion of the length of the insulated metallic conductor to cause the first colorant material to be applied to the first portion of the length of the insulated metallic conductor;
• directing a spray pattern of a second colorant material toward the second, successive portion of the length of the insulated metallic conductor to apply the second colorant material to the second, successive portion of the length;
• and
• twisting together the two successive portions of the length of the surface colored insulated metallic conductors to provide an electrically matched pair.

A method of making an electrically matched twisted pair of insulated metallic conductors, said method comprising the steps of:

• applying a substantially non-porous insulation material to first and second successive portions of a length of elongated metallic material;
• causing relative motion between the length of insulated metallic conductors and sources of colorant materials along a path of travel in a direction along the longitudinal axis of the insulated metallic conductor;
• while
• directing spray patterns of one colorant material toward the first portion of the length of the insulated metallic conductor at an angle to the path of travel of about 105.degree. to about 135.degree., the spray patterns being staggered along and spaced generally equiangularly about the path of travel and cooperating to prevent unintended undulations of the insulated metallic conductor as the relative motion is caused to occur, wherein the one colorant material is moved from a source into a manifold and distributed to each of a plurality of spray nozzles and said method further includes the steps of interposing a shield between the insulated metallic conductor and the nozzles of the manifold and thereafter causing another colorant material to be emitted from nozzles associated with another manifold and directed toward the second portion of the length of the insulated metallic conductor;
• then
• twisting together the first and second successive portions of the length of elongated metallic material to establish an electrically matched pair of metallic conductors which are distinguishably colored.