[Antennas] formulas for sizing load coild in a dipole

[Ed - K9EW]

Hi Riccardo,

The ARRL Antenna Book has the information you're looking for in Chapter 6,
in the section on "Shortened Dipoles".  There's a chart in there (Fig 55 in
my book) of Inductive Reactance (of the loading coil) versus the position of
the coil.  You can choose the amount of shortening of the dipole that you
want.  Of course, the longer you can make it, the more efficient it will be.

Hope this helps.

73,
ed - k9ew


On 4/17/06, ik0clm <ik0clm at libero.it> wrote:
>
> i am building a rigid dipole for 3.5 mhz , two coils on the center feed of
> the dipole shall shorten the length...
> where i can find the formulas for knowing the right L in microhenry due to
> a data antenna length?
> thanks for the help
> riccardo
> ik0clm
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