[Lf] Wire in the Air etc

[Andre Kesteloot]

Mike Dennison wrote:
> 
> >        About antenna .  I wonder if the increase in efficiancy is caused
> > by the higher antenna capacity which permits smaller coil and therefore
> > less loss due to coil resistance.  This might also explain the big
> > signals from  Jack and the OH station.  I am thinking of putting up a 50
> > ft vertical with a 400 ft long wire from top.   How does that sound?
> >       John VE1ZJ
> 
> You will only save an ohm or two on the loading coil, whereas there is much
> more to be saved in the earth resistance. As with most amateur radio, the big
> signals have lots of wire at a good height.
> 
> Your projected antenna would be the envy of most Eu operators, but if you
> can get it higher - even at the expense of length - it will work better. ERP is a
> function of effective height squared. The effective height is directly
> proportional to actual height, but the relationship between actual and real
> height is not affected much once you have a good size top section, so actual
> height is the most important. Of course, as Laurie has demonstrated, it also
> helps if you can increase the current significantly with a bigger top section, as
> ERP is also a function of current squared.
> 
> Mike, G3XDV (IO91VT)
> http://www.lf.thersgb.net