[Lf] [Fwd: LF: Re: Re: Re. LF Aerials etc.]

[Andre' Kesteloot]

vernall wrote:

> Christer SM6PXJ wrote:
> I have made some changes in my antenna system, which might be of interest
> with regard to the recent antenna discussion.
>
> The antenna system consists of a 21 m vertical and 4 top wires, 20 m each.
> The total (feed) impedance is 22 ohms.
> This morning I extended one of the top wires from 20 to 55 m. The new wire
> goes in a straight line at 18-21 m height.
> 15 turns was removed on the loading coil (diam. 450 mm) to get resonance.
> My hope was that the feed impedance would go down a bit but this was not the
> case.
> I have the same feed impedance (and antenna current) as before.
> There must of course be a minor improvement due to decreased losses in the
> loading coil, but this can't be detected in the measurements made.
>
> ZL2CA comment:
> The implication is that you are reaching the optimum "power factor" of your
> "lossy capacitor" in the associated environment.
>
> I also have a resistive component of around 20 ohms, and have added on some
> extra wires, but (after retuning) they do not seem to "earn their keep".
>
> 73, Bob ZL2CA