The Strange Case of an Unknown Coaxial Cable Manufacturer By Peter Stewart-Hay
A very old sample of a coaxial cable was given to us and we said that we would identify the manufacturer. This turned out to be much more difficult than we thought it would be.  
   Here are the particulars of the cable design:
Inner Conductor - Solid copper and this tells us that the design is really old. Dielectric Material - Injected low density polyethylene disks equally spaced (but fairly loose) along the inner conductor. The disks are sort of held in place by the outer conductor. Outer Conductor - Smooth copper tape longitudinally applied and rolled into a circular shape with fingers along the edges. These fingers are interleaved and roll crimped. This suggests a fairly dry climate. Again, the copper outer conductor tells us the design is really old. Electromagnetic Shielding - Two terne coated steel tapes, helically applied and overlapped a minimum of 1/4 inch. There is of course no galvanic protection between these tapes and the outer conductor so a far better solution would have been to use copper coated steel tapes. (More expensive though!) Inner Jacket - Clear Polyethylene. Lightning Shielding - Smooth aluminum tape, longitudinally applied and overlapped a minimum of 1/4 inch. There is no copolymer coating on the tape and this again demonstrates that it is a very old design. Armour - Bare steel tape, corrugated, longitudinally applied and tar flooded. Interestingly, there is no galvanic protection between this tape and the aluminum lightning shielding tape again suggesting a fairly dry climate. Outer Jacket - Black Polyethylene. To get more exposure on the Internet, we placed a query on the Wire Association International Forums. Finally, three years later, the cable manufacturer was identified. This design of this cable was built in Australia by Olex Cables Limited. It was installed in and between the major cities there in the 1960's, the 1970's and in shorter lengths in the 1980's. Wow, this was a really tough cable to identify and remarkable that it was sold in Eastern Canada