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Re: [TowerTalk] rotating delta loop

To: towertalk@contesting.com
Subject: Re: [TowerTalk] rotating delta loop
From: Brian Alsop <alsopb@nc.rr.com>
Date: Fri, 30 Aug 2013 13:47:39 +0000
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I had a four element GEM quad (second director to reflector spacing element spacing on 20M ~22'). I modeled it in EZNEC.

With ground reflection gain, it came in about 15 dbi on 20M.

Subtract about 6db or ground reflection gain and it becomes 9 dbi. Subtract 2.2 db and it becomes 5.8 dBd.

So something like the quoted 11.5 dBd is a reasonable number if it includes ground reflection gain.

73 de Brian/K3KO


On 8/30/2013 13:32, chetmoore wrote:
Well spoke Pete,  my thoughts exactly, no real meat in those posts

Chet  n4fx

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Pete
Smith N4ZR
Sent: Friday, August 30, 2013 6:46 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] rotating delta loop

Well, let's be clear - this message was nothing but a thinly disguised
commercial advertisement.  The gain number reminds me of some of those we
used to see in ads.

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 8/29/2013 12:35 PM, john@kk9a.com wrote:
This is good gain for the boom length.  It would be nice if there were
photos on the website.

John KK9A


List-post:       <towertalk@contesting.com">mailto:towertalk@contesting.com>
Date: Tue, 27 Aug 2013 18:18:57 -0700
From: Robert E G Earl <bearll@telus.net>
To: towertalk@contesting.com
Subject: [TowerTalk] rotating delta loop


I have made a 4 element deltaloop on a 30 foot boom for 20/17/15/12/10
meters in 1983. I have since refurbished the antenna and I am now
re-installing at my new address. The gain for 4 elements is around
11.5 dbd. If anyone is interested, I have put together a website that
describes my findings. I can work most on the 1st or 2nd call. The
antenna is very quiet for those very weak ones. My website is
WWW.deltaloopantenna.ca or com.

73 Bob VE7SQ

###  here it states a 4 el 20m monoband delta loop....on a 24.6 ft long
boom.

(snip)

##  so its  6.26 dbd  on a 24.6 ft long boom.    That's pretty good,
considering F12 rates their 4 el yagi  on a 30 ft boom at 6.0 dbd.
A 204BA  is aprx 5.5 dbd.     My 5 el F12 yag on a 36 ft boom is only 7.3
dbd.
   A 3 el on a 18 ft boom is only 5.2 dbd.   The F12 6 el
on a 44 ft boom is  7.8 dbd.
##  How long is each of the three spreaders ?   Im guessing at least 13-14
ft.
   That's  39-42 ft in total.

##  What this needs is a  40 ft boom....and 2 more eles.  Then it becomes
a
flame thrower.   Keep up the good work.

later........ Jim  VE7RF
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Version: 2012.0.2242 / Virus Database: 3211/6122 - Release Date: 08/30/13





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No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2242 / Virus Database: 3211/6122 - Release Date: 08/30/13

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