Re: Does a low SWR mean your antenna is a great performer?
Yes I think that a presentation would be a great idea--TLARC is looking for new presentations. I myself put in memory the 4-11-25% rule. i.e. 1.5:1 is 4% loss, 2:1 is 11% loss, and 3:1 is 25% loss. I found a document online that confirms my memory is correct:toggle quoted messageShow quoted text
And as you point out, 2:1 is a .5 dB loss. Even 3:1 is only a 1/5 of an S-unit (1.25dB loss); I'd say that a computer can hear that difference but probably not a human.
Many modern radios will start cutting power back at even moderate VSWR levels. So as you say, watch the power out. Both of my Kenwood HF radios are picky on 6m for example.
VSWR can have a bad effect on surge arrestors if you happen to buy a low power one and operate it with high VSWR. (3:1 is literally 3x the voltage). But I doubt any of us would do that, at least on purpose. I went over that in my surge presentation about a year ago.
On 9/21/2020 12:48 PM, John Haskell via groups.io wrote:
What George quoted from ham.stackexchange is correct.