[TowerTalk] [antenneX] Small and exotic antennas evaluated

[David Gilbert]

Same with the DDRR.  It's official name is Directional Discontinuity 
Ring Radiator, which was supposed to refer to how it "worked", but in 
reality it's just a very short vertical antenna with a transmission line 
wrapped in a circle to provide top loading.  Like any other piece of 
metal that you can manage to feed some power without blowing up your rig 
it will radiate >something<, but the original explanation for it's 
function was ridiculous.

Many of the purported descriptions for these small antennas and how they 
function are frankly embarrassing for a hobby supposedly based in science.

73,
Dave   AB7E



On 1/18/2017 11:10 PM, Jim Thomson wrote:
> Date: Wed, 18 Jan 2017 11:19:35 -0500
> From: K7LXC at aol.com
> To: towertalk at contesting.com
> Subject: [TowerTalk] [antenneX] Small and exotic antennas evaluated
>
> Howdy, TowerTalkians --
>   
>      You may be interested in these books.
>   
> Cheers,
> Steve    K7LXC
>   
>>   SMALL & EXOTIC ANTENNAS
> A compendium of antenna  evaluations. Learn the real performance from the
> experts!
>
> 50 Chapters and  468-page book ready for immediate download.
>
> This book provides excellent  knowledge by experts about how antenna
> technology has evolved over the past 20  years.
>
> One look at the list of contents shows just how large of a void  it fills
> about the myriad of concepts to shrink the present antenna  designs.
>
> For more  info:
>
> http://www.antennex.com/Sshack/eval/eval.htm
>
> ###  Superb. I had 3 x Isotrons when I was in the condo years ago,
> 80-40-20m.   The only thing that radiates is the...feedline, typ 8 ft long.
> Put a good balun on it, and it wont radiate at all, which is why they dont
> recommend  using a balun.  Of Course CQ rag did a review on the isotron, and
> had them hyped beyond max...installing them on a tall tower to boot...with a
> 200 ft feedline.
>
> ##  Fractal ants, EH, etc, they are all junk.  Cant wait to read the book though,
> it should be a good read.   Even scientific american drank the fractal coolaid,
> pure junk science.
>
> ##  somebody did another book several years ago,  how trapped ants actually work,
> esp  trapped tribanders.  Baffles me how wilson electronics managed to get a hairpin
> match to work on  a 20-15-10m yagi.  Mosley of course, introduces enough trap losses,
> such that the normal  20-25 ohm DE feedpoint Z, ends up being 50 ohms.
>
> ##  our local radio inspector buys a TA-33 jr.   His reason was... cuz it had a dead flat swr.
> He also found out....fast, that it was also a good 10 db down from a  204BA.    That same
> 33jr vs  204BA  experiment has been done at least 8 times here in town..all with the same results.
>
> Jim  VE7RF
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