[TowerTalk] Choke on feed point of dipole

[Richard (Rick) Karlquist]

On 1/12/2026 10:46 AM, Tom Hellem wrote:
> TT'ers:
> 
> I made a choke to place at the feed point of a 20 meter vertical dipole.
> 9 turns of #14 thhn wound on a 2.4" mix 31 ferrite toroid.
> After I installed the choke, the resonant frequency appears to have
> moved approx. 1 mhz lower.
> 
> Tom
> K0SN

Could you explain what you are doing in detail.  I don't understand why
you need an inductor (choke) to feed the dipole.  What I have always
done is to build a 33 foot radiator pole and feed it from the bottom.
A simple L-C matching network at the bottom works fine with no radials.

73
Rick N6RK