Takes a bit to think of your Yagi antenna as a 50 to 377 Ohm impedance transformer.
And if you are building Stealth aircraft, you want them to look like 377, not 50 Ohm dummy loads!
Kent WA5VJB
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On Sunday, August 16, 2020, 6:16:32 PM CDT, Jerry Gaffke via groups.io <jgaffke@...> wrote:
I think the question comes down to what makes the antenna structure radiate efficiently.
This usually involves getting some conductors up that are a significant fraction of the wavelength.
And at least some of us are curious in what direction it radiates.
Resonant is not so much an issue.
We can match the impedance of almost anything with the appropriate antenna tuner.
That "impedance of free space" thing is a new concept for me, rather cool.
Seems to be an integral part of how a radio wave propagates through space,
but not so much with how we launch it into said space.
? ?
Jerry, KE7ER
On Sun, Aug 16, 2020 at 02:33 PM, <namerati@...> wrote:
If all that is true, what actually causes an antenna (or any structure) to
resonate? Are they merely transformers matching the input line to the
impedance of free space? Why not just then wind a 50 to 376 ohm matching
transformer and leave the secondary open?
