What is the meaning of twin lead cables?

Question

What is the meaning of twin lead cables?

Answer 1

Twin lead cable is made of two parallel conductors about 1/2 inch apart and encased in insulation. The resulting cable is flat. This used to be the standard for connecting a TV antenna to the TV, but has largely been replaced by co-axial cable. Coaxial cable has lower losses and is picks up less interference. Twin lead has an impedance of 300 ohms while co-ax has an impedance of 75 ohms. Older TVs and antennas were made for a 300 ohm impedance, so a matching transformer had to be used is you wanted to use co-ax. Modern TVs are set up for 75 ohm. Twin lead was cheaper.

see this link for pictures and more http://en.wikipedia.org/wiki/Twin-lead

http://en.wikipedia.org/wiki/Twin-lead

Answer 2

It could be this:

http://www.gore.com/MungoBlobs/controlle...

or this:

http://www.electronicplus.com/images/pro...

or this:

http://support.radioshack.com/SUPPORT_vi...

Twin lead is 2 wires insulated from each other.  They may be twisted together as in picture #1, or separated in linear fashion as in #2 and #3.  If they are separated by an exact distance and the diameter of the wires is consistent and precise, then the impedance of the cable may also be controlled, as in #3 which is 300 Ohm twin lead cable.

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Answer 3

One piece or wire (cable)  inside contains 2 individual insulated wires. This cable can be  shielded (for grounding purpose) or without shielded.