[Lf] [Fwd: LF: Re: Re: Ant Questions]

[Andre Kesteloot]

Vernall wrote:

> Martyn,
>
> Advice from Mike is similar to what I would advise.  Expanding on one point:
>
> > >I am assuming (within practical limits) that as much capacitance as
> > possible in the antenna is beneficial. It will resonate with lower
> > inductance and therefore lower resistive losses.
> >
> > Yes, that is correct.
>
> Correct in respect of an ohm or two in coil loss (equivalent series R), but
> more complex in terms of net ground loss which is likely in the range of
> tens of ohms to a hundred ohms, and is unlikely to change much with
> variation in spacing of parallel wire top loading.  The capacitance should
> be maximised in the top loading, but not in the "up-wire" (multiple
> up-wires, if needed, should taper to a single connection point at the lower
> end).  Within reasonable limits, the up-wire should be clear of the house
> and tree, and rise vertically from the top of a ground mounted loading coil.
> The "environmental soakage" from the lower part of the up-wire (which is all
> at high voltage) is another insideous factor that increases equivalent
> series resistance.
>
> 73, Bob ZL2CA