[TowerTalk] rotating delta loop

[Brian Alsop]

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 at contesting.com] On Behalf Of Pete
> Smith N4ZR
> Sent: Friday, August 30, 2013 6:46 AM
> To: towertalk at 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 at 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 at contesting.com">mailto:towertalk at contesting.com>
>> Date: Tue, 27 Aug 2013 18:18:57 -0700
>> From: Robert E G Earl <bearll at telus.net>
>> To: towertalk at 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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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