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Flex dryer vent hose loop antenna
On 11/10/2015 10:10 AM, amdx wrote:
On 11/10/2015 2:02 AM, rickman wrote: On 11/9/2015 7:52 PM, Jeff Liebermann wrote: My solution would be to use aluminum instead. Copper is not really superior in a meaningful way and costs a lot more. Money rears it's head as an issue, aluminum is cheaper. +1 for aluminum. Resistivity is 65% higher for aluminum. I'd give that a -1, however, if maximizing Q is not important in your design then still at +1. I can overcompensate for the increased resistivity by using larger tubing and still save $$$, +1 for aluminum. Resistivity is not resistance. Oxidation: Copper oxide vs Aluminum oxide. Aluminum oxide is an insulator. How does that affect skin resistance? I don't know, does it just shrink your tubing by the thickness of the oxide? How many atoms is that in aluminum? So we are talking nanometers? I started with a tube that is 100% larger, so still lower conductivity. Copper oxide is said to be a semiconductor, has much, much lower resistance than aluminum oxide. Page 5, http://www.ets-lindgren.com/pdf/emctd_1293_weibler.pdf Or just varnish it. Bottom of page, http://hamwaves.com/coils/en/ Aluminum is a great material to work with. The oxides are irrelevant. -- Rick |
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