>
>
>
>
>Hi all,
>
>I'm in the process of building some halfwave verticals to use portable on HF
>with the aid of a DK9SQ telescoping fibreglass pole.
>
>I am building the LC matching system to convert the high impedance at the
>end of the halfwave down to the 50ohms to match the coax.
>
>My question is this! I'm sure in the past I have seen a computer program
>that allows you to key in the frequency and it will give you the length
>required and the values of inductance and capacitance required.
>
>Does anyone know were I can locate this program or if there is a manual
>calculation I can use for the LC values.
>
I have a halfwave vertical for 80m, The feed Z is around 1000-ohms. I
match it to 50-ohms with a variable L and a variable C. This allows
coverage from 3.5MHz to 4MHz with a 1.0 to 1 SWR.
cheerio, David
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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