Topband: Question about on ground radials field.

[donovanf at erols.com]

Hi Jim, 


That simply makes the radiating part of the vertical taller and elevates 
feed point. 


Its known in professional antenna engineering circles as a sleeved 
monopole with elevated feed point. The classic version is a vertical 
with its feedline routed through a sleeve that is 1/2 the length of the 
vertical above the feed point at the top of the sleeve. The bottom 
of the sleeve is connected to radials laying on the ground or 
slightly buried. 


Its similar in concept to the off-center fed dipole. 


73 
Frank 
W3LPL 




On Thu, Dec 31, 2020 at 9:48 AM Jim Clymer <ws6x.ars at gmail.com> wrote: 

> Hello Gang, 
> This is somewhat related to the "Will radials on ground help?" thread. I 
> have poked around in various discussion groups but haven't found a specific 
> answer. 
> Assuming I have a fairly decent radial system on the ground (60 radials of 
> various lengths, some longer than 1/4 wave, many shorter), what happens if 
> I elevate the feedpoint of a quarter-wave, base-fed vertical? Let's say I 
> have an aluminum mounting post properly bonded to the radial plate, the top 
> of which will serve as the "radial system" connection for the vertical. Is 
> there some fractional part of a wavelength that the feedpoint could be 
> raised and not lose the effectiveness of the on ground radial system? 
> Thanks, and HNY to all! 
> Jim - WS6X 
> 
> > 
> > Today's Topics: 
> > 1. Re: Elevated Radials - will radials on ground help? 
> > ---------------------------------------------------------------------- 
> > Message: 1 
> > Date: Wed, 30 Dec 2020 13:15:19 -0500 
> > 
> > > I was under the impression that If you have elevated radials and if you 
> > > take even one to the ground you might as well move all to the 
> > > ground..??Fred KB4QZH 
> > 
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