Hi Pete,
Here is picture of coil I made to tune Inv. L at 9Y4 with 15-20 Ohm impedance.
It was tuned in 2 steps:
1. calculate and wound coil to rise R close to 50 Ohm
2. adjust horizontal wire length back to desired freq.
https://photos.app.goo.gl/7eVBt5t8yCAvsaZg7
Used thin wire for coil, not sure if it is right or not, used what I had there.
73
Arunas LY2ij /LY5E
2019 m. rugsėjo 1 d., 21:47 val., "N4ZR" <n4zr@comcast.net> parašė:
> The other day a ham friend suggested using a coil ("hairpin") to match
> the low impedance of a well-radialed inverted L to 50-ohm coax. This
> struck me as a potentially-attractive alternative to a series vacuum
> capacitor, but I don't know enough to evaluate it. Thoughts?
>
> --
>
> 73, Pete N4ZR
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