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Re: [TowerTalk] [antenneX] Small and exotic antennas evaluated

To: towertalk@contesting.com
Subject: Re: [TowerTalk] [antenneX] Small and exotic antennas evaluated
From: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 19 Jan 2017 00:43:08 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

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@aol.com
To: towertalk@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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