Re: Does a low SWR mean your antenna is a great performer?
WK9M
Sounds good Allan; the actual loss depends on transmission line
quality and frequency then as we chatted on the phone when I was by
Ralph's earlier. i.e the losses would be much greater with a long
run at 440MHz and 3:1 as it bounces back and forth. Maybe we should
just superconducting coax and then the answer is always 100%? Ok so
maybe not practical on that one. :)
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I found the actual article on voltage, VSWR, and surge suppressors that I had talked about during the presentation if anyone is interested. The formula is (2) on page 4 of this document for the techies in the club: http://www.arrl.org/files/file/QEX_Next_Issue/2016/JulyAugust/Hinkle.pdf Vpk=sqrt(100*PWR*SWR) So on a 100W signal into 50 ohms at 1:1, the common Ohm's law formula states 70.7V (P=(V^2)/R); solving for V. At 3:1, the voltage isn't 70.7*3=210.9V but 173.2V...a little less than 3X as you noted. With 1.5kW, it's an amazing 671V. So that's why you always tune high power. '73 Randy
On 9/22/2020 2:29 PM, John Haskell via
groups.io wrote:
Randy,

