[Antennas] Re: Elevated Ground Plane Question

Thu, 10 Oct 2002 10:52:10 +0200

...no, the discone is really an inverted ground plane, a top fed. It main
virtue when ic came out first was its wide band capabilities, nothing else.
As far as the other characteristics are concerned, you can turn it "wrong
way up" without any but mechanical problems. We tried it in the air force
and couldn't detect any differences between the nomally mounted one and the
"upside down" one. It was at the time at a height of about 10-12 feet.
		Alex	4Z5KS

-----Original Message-----
From: Dave Shrader [mailto:[email protected]] 
Sent: Wednesday, October 09, 2002 8:54 PM
To: George, W5YR
Cc: alexander eban; '[email protected]'; W2WU;
[email protected]; [email protected]
Subject: Re: [Antennas] Re: Elevated Ground Plane Question

George are you confusing the 'discone' broadband design with the
descriptions in this thread?

Deacon Dave, W1MCE

"George, W5YR" wrote:
> 
> It is interesting that you see some commercial VHF and UHF antennas 
> installed that way with the radials and the feedpoint at the top. I 
> suspect that the applications for such an antenna are very few and a 
> lot of conditions have to be met before it is superior to a 
> conventional ground plane.
> 
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> In the 57th year and it just keeps getting better!
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121
> 
> alexander eban wrote:
> >
> > ...this is NOT top loading. A few years back MFJ put out what was 
> > called at the time ;Top Fed Antenna. The rationale behind it was 
> > that since the energy goes out at a slent angle from the radials 
> > and/or grounplane, feeding the antenna at the top and moving the 
> > ground plane at the top would result in radiation parallel to the 
> > ground. Actually it was shot into the ground! That antenna was never  
> > popular, probably because a lot of guys figured out something's 
> > fishy. The only good thing of that antenna was the size. I wouldn't
recommend it, certainly not as a main antenna!
> >                         73 and all the best
> >                                 Alex    4Z5KS.
> - - -
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected] 
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