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On Sat, 25 Oct 2003 07:09:10 -0500, Neil Down
wrote: wrote in : On Sat, 25 Oct 2003 02:21:12 -0400, wrote: On Fri, 24 Oct 2003 22:23:48 -0700, Frank Gilliland wrote: In , lancer wrote: snip Chrome has about the same conductivity that Stainless does, or at least from the info I found. 3-15% for Stainless, 19% for chrome, relative to copper. For a conductor 102" long with a diameter of 0.625", the following metals have the following AC resistance at 27 MHz: Chromium .0194 ohms Copper .00711 ohms S. Steel .0451 ohms http://www.amm.com/index2.htm?/ref/conduct.HTM Chrome has 55% the conductivity of copper Steel (all types ) 3% - 15% 17-7 ph stainless steel is used for most stainless antennas Its resistivity compared to the standard (copper) can be found here http://www.hpmetals.com/elec_resist.asp Copper = 1.71 microohm-cm 17-7 ph = 83 microohm-cm In other words stainless antenna stock has 2% the conductivity of copper. What type of material is the whip of the exterminator? SS right, the few inches of copper or chrome material of that antenna will make little or no difference what so ever, you guys are nit picking about something that in this application is un noticeable. The top section of that antenna is made from stainless steel. The top section also has very little current flowing in it. The bottom section has a majority of the current flow and does most of the radiation. It maybe nit picking, but in theory the difference can be seen. If you would see it in the real world is another question. |
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