Topband: LOOP on ground test 160m

[Artek Manuals]

Andy

I did a lot of experiments about two years ago with LOGs and BOGs.  
Generally I found the BOG to be better and a smaller investment in 
"wire". I did a lot of experiments with feeding the LOGs in different 
locations (sides, corners, etc) and the results we never very 
outstanding. Now I was not as religious about having the LOG actual 
laying on bare earth everywhere ( see next paragraph) since I was not 
aware at the time that actual laying on top of the ground might be 
better for this family of antennas.

My other observation is that for best F/B and RDF is that unlike it s 
big brother the BEVERAGE that shorter is better for the BOG. In my case 
I have very poor soil (.001/5) . 6" down it pure white sand it ever 
stops raining here in Florida for a year it will become a large sand 
dune. In my case extensive modeling with AutoEZ and EZENEC PRO4/Ver6. 
suggest that optimum F/B @20 degrees arrival is obtained at at about 225 
feet (68 meters) and optimum RDF is obtained at ~275ft ( 84M) . I then 
ran the same analysis with better soil conductivity and optimum BOG 
lengths were even shorter!  This is likely the reason that some folks 
report that the BOG is a reasonably good performer and for others find 
it is useless.

Now as a matter of full disclosure, all my BOGS are bi-directional with 
reflection transformers at the ends and  made from RG6, so the actual 
antenna (not just the feedline) is a bigger conductor than a "wire" I 
also noted in both theory and in practice that elevation above actual 
earth of even a few inches destroyed the F/B. I have since gone to great 
pains to get my BOGS "touching" the bare sandy earth . Those of you with 
real dirt and or grass may have a different experience !!

Dave

NR1DX

On 1/7/2022 3:06 AM, Andree DL8LAS via Topband wrote:

>   Hey gentlemen,another test with a new RX antenna here at my QTH.Weather was fine yesterday, so I built a LOG.Size 30m x 30 x 30 x 30,
> direction 315/125.First test this morning was not bad , compared to my 180m long beverage to USA.The LOG is a little bit more noisy, but for a simple wire absolutely ok.If you are interested, here is a video from the QSO N1PGA whileswitching the RX antennas.
> https://www.youtube.com/watch?v=IA2IZeG0LpU
> 73 , Andy DL8LAS
>
>
>
>   
> www.dl8las.com
> www.swing-company-bigband.de/
> www.uni-big-band-kiel.de/
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com

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