[Antennas] Vertical

[cboone@earthlink.net]

It sure seems that way....a 90deg radiator (1/4 wave) is 36 ohms Z
already....by shortening it, that causes the radiation resistance
to LOWER more.....if lengthening the radials causes the Z to get
back to 50 ohms, then you have increased ground loss and that is NOT
as efficient as leaving it at full 1/4 wave length with 1/4wave
radials.

Chris
WB5ITT

Johnathan Corgan wrote:
> 
> On Saturday 28 September 2002 10:54, Charles Greene wrote:
> 
> > I made the radiator slightly short and the radials about 2' long to bring
> > up the feed impedance to 50 ohms
> 
> I'm curious (and confused) how this works.
> 
> My (naive) assumption would be that the feedpoint impedance is increasing
> because the "ground" resistance is increasing from the shorter radials.
> While obtaining a better match to 50 ohm coax, doesn't this just mean that
> the antenna is less efficient due to the increased ground losses?
> 
> I could be way off base--it wouldnt' be the first time :-)
> 
> 73