Talk:Primary line constants

Proposal to split and merge with "Telegrapher's Equations" or related article
I would like to propose splitting and merging this article with "Telegrapher's Equations" or "Propagation constant". This article has good information that should be available in those articles. There is information here regarding the Telegrapher's Equations that does not appear in "Telegrapher's Equations". The primary line constants have physical meaning and exist even if the Telegrapher's Equations did not exist, so this topic should exist. I think everything from the "Characteristic impedance" section on should be merged with "Telegrapher's Equations" or "propagation constant". And if it is too much detail for those articles, then perhaps the detailed part should go into a new article called something like "Telegrapher's Equations -- Detailed Derivation" and a link provided to it in the "Telegrapher's Equations" article. Constant314 (talk) 16:24, 31 May 2010 (UTC)


 * Overlap is not in itself a bad thing. It is often necessary so that each article can stand on its own.   Sp in ni  ng  Spark  16:56, 31 May 2010 (UTC)

Measurement of primary line constants
I suspect that at high frequency that the secondary constants are measured and the primary constants are calculated from that. At low frequencies I suspect that it is measured just like any R, L C, or G component. Constant314 (talk) 03:11, 29 October 2012 (UTC)


 * R, C and G are easily measured directly. L is usually more difficult as in most cables it is swamped by the others, especially C, so is more often calculated. Cables with modern dielectric material, especially when new, have G so low that a substantial length of cable is needed to measure accurately.  Spinning  Spark  07:17, 29 October 2012 (UTC)


 * I must admit that I don't know how anybody else measures the primary parameters, but the last time I needed to do that in the 1 MHz+ range I used an impedance/network analyzer that gave me the secondary parameters and then used them to calculate the primary parameters. I probably did it that way because of the available instrumentation.Constant314 (talk) 23:20, 29 October 2012 (UTC)