Topband: Fwd: radals fer 160m vertcal

[BP Veal]

Gull Winged raised radials cut to resonance seem to be excellent above ground radials-  But I am in a small yard, and have my MA160V hooked up to radials going all over the yard, buried, of various lengths, 10-80 feet, about 60 of them- it only goes out in about a 100 degree pattern as the antenna is in the corner of the yard-they work as the resonance point and SWR bell curve really are effected when they are hooked up-  15KHz of usable bandwidth at a 4:1 SWR (matched with an UnUn to 1.5:1) vs 60KHz bandwidth without the radials at a 1:1.2 SWR, reflective of the hidden ground loss and impendence mismatch- -  so even in a puny yard, with limited space, measured effect of buried radials can be significant.......too many dogs and kids for raised radials.......

Bryon "Paul" Veal  MAED
FCC Amateur Radio License-N0AH
n0ah at arrl.net
Home Page at http://groups.yahoo.com/group/HamRadioPropagation/




 

> Date: Fri, 4 May 2012 18:34:31 -0700
> From: jim at audiosystemsgroup.com
> To: topband at contesting.com
> Subject: Re: Topband: Fwd: radals fer 160m vertcal
> 
> On 5/4/2012 5:52 PM, James Rodenkirch wrote:
> > What about radials above the ground? Like what I'm planning to install --- base of the vertical at around 5' to 6' above ground and slope all of the radials from that 5' or 6' point down to the ground?
> 
> N6LF has published extensive work that he did on 40M showing that 
> radials elevated only a feet or so were quite effective, and that a foot 
> higher was better, but close to many radials on the ground. I tried 
> scaling this to 160M, placing radials at about 5 ft. They were NOT 
> particularly effective, and I had the chance to discuss the issue with 
> N6BT, who has studied elevated radial systems extensively on 160M. 
> Paraphrasing Tom, the earth at 160M is a rather different animal than it 
> is at 40M. Tom suggested that 16 ft was a better height for a few 
> elevated radials on160M, and I hope to move the ones on my experimental 
> antenna to that height in the next month or so, perhaps even before 
> leaving for Dayton.
> 
> 73, Jim K9YC
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