Tom .... I think everything is real quiet while a bunch of folks are busy looking at manuals and crunching numbers with their analyzers. Someone wants to find a mistake in your opinion.
Stand by. ----------------- Wes Attaway (N5WA) ------------------- 1138 Waters Edge Circle, Shreveport, LA 71106 318-797-4972 (Office) - 318-393-3289 (Cell) Computer Consulting and Forensics -------------- EnCase Certified Examiner --------------- -----Original Message----- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI Sent: Monday, September 10, 2012 8:29 PM To: topband@contesting.com Subject: Re: Topband: electrical wavelength > Run the numbers and for RG-6 we see that sq root of L/C is good above a > couple hundred kHz. > > Dave WX7G I just ran it in MathCAD and it showed a Zo and Vf slope starting down around 150 kHz, but I assumed the conductors were solid copper. Conductors have to be in the thousands of a inch range thick to cause an HF slope, because skin depth is .00256 inches on 1 MHz for copper. I cannot understand the HF and higher numbers at all, where it is all pretty much set by the dielectric constant slowing the TEM wave. I don't even think it would be a practical concern down to 100 kHz or so where copper skin depth is .0081 inches and we might be getting into the steel core, or am I missing something here? :-) 73 Tom _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK