My.....my........ For heaven's sake......! What concerns about a meager
2:1 SWR!! Just go with it, get on the air, and enjoy.
Dave - W?LEV
On Thu, Nov 14, 2024 at 7:15?PM DP via groups.io <dpoinsett=
[email protected]> wrote:
Hi Barry K3EUI
You and others make an excellent point about the practical acceptability
of of a 2:1 SWR. I agree that for the casual ham using commonly available
equipment, it's probably not a big deal especially on the lower HF
frequencies.
You are correct that by adding an inductor across the antenna terminals
and altering the antenna dimensions, the feedpoint impedance can be
transformed to 50+j0 ohms, but the cut-and-try approach will be no easier
than any of the other suggested methods. Also, just adding an inductor will
not automatically increase the impedance. Depending in the initial antenna
impedance, it may go up or down.
If we stay with Bill's 25-ohm example, the antenna length and angle
between each leg could be adjusted to get a 25-j25 feedpoint impedance at
say 7.15 MHz. Adding a 1.1 uH inductor across the antenna terminals will
then get you to 50+j0 ohms. Other combinations could work, too. Of course
whatever combination he comes up with will only work at the design
frequency.
Dave NU8A
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*Dave - W?LEV*
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Dave - W?LEV
