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  #17  
Old 12-05-2011, 02:10 PM
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11 Meter Loop Antenna

Homer; is this how you did it?

Looks really easy to do.

How does the quietness of the receive compare to a vertical at the same height?

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File Type: jpg 11-meter-loop-antenna.JPG (14.8 KB, 115 views)
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Old 12-05-2011, 02:19 PM
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Yes, Rob, just like that, except my coax is less squiggly
Lil'Yeshua likes this.
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Old 12-05-2011, 02:25 PM
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Quote:
Originally Posted by Needle Bender View Post
because you took your picture at about a 45 degree angle from the antnena itshard to tell if its laying horizontle or verticle. if its laying horizontle then your radiating more up then out. try it verticle like the driven el of a quad and i bet you will get better performance. bottom driven is horiz polarity and one side is verticle. id do horizontle for dx
You may be right. At the moment it seems to be responding as a horizontal would. Local verticals are way down, and DX is up. I would expect a straight up, ie vertical, radiation pattern to give me stronger local.

This antenna is an 11 meter center/spreader mounted version of what would be a Loop Skywire were it supported from the corners. Horizontal loops have horizontal polarity. I have had quad loops standing up on their edge, in fact, a quad beam fed from a side which did operate vertically just as you suggest.
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Old 12-05-2011, 02:27 PM
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Quote:
Originally Posted by Robb View Post

How does the quietness of the receive compare to a vertical at the same height?

It is quieter than the vertical, but at the moment the only vertical I have up is the Sigma 4 at 41.5 feet. This is 30 feet.
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Old 12-05-2011, 02:41 PM
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Quote:
Originally Posted by HomerBB View Post
You may be right. At the moment it seems to be responding as a horizontal would. Local verticals are way down, and DX is up. I would expect a straight up, ie vertical, radiation pattern to give me stronger local.

This antenna is an 11 meter center/spreader mounted version of what would be a Loop Skywire were it supported from the corners. Horizontal loops have horizontal polarity. I have had quad loops standing up on their edge, in fact, a quad beam fed from a side which did operate vertically just as you suggest.
Hey HomerBB, you know I have been getting ready to do a loop myself. Great job on yours! A lot of the ham loop sites I have seen recommend using the loop vertically for dx. I like the quietness of horizontal polarization. One nice thing about the new QTH is that the power lines are all buried, so QRM is not an issue here.

I know it's not a fair comparison, but my extended double zepp for 11 meters made it to WR080 in Hawaii the other day. And that was 12 feet in the air, under a roof.

I enjoy seeing all the stuff you build, so please keep up the great work and posts!

73,
RT307

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Old 12-05-2011, 03:50 PM
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Quote:
Originally Posted by HomerBB View Post
You may be right. At the moment it seems to be responding as a horizontal would. Local verticals are way down, and DX is up. I would expect a straight up, ie vertical, radiation pattern to give me stronger local.

This antenna is an 11 meter center/spreader mounted version of what would be a Loop Skywire were it supported from the corners. Horizontal loops have horizontal polarity. I have had quad loops standing up on their edge, in fact, a quad beam fed from a side which did operate vertically just as you suggest.
thing is if you have it laying down like that then the 2 current nodes are a quarter wave out of phaze to the sides but standing upright its like 2 horiz el one above the other giving you a lower toa for horiz in the front and back directions

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Old 12-05-2011, 04:20 PM
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One might turn this loop vertical and place another loop ~10% larger in diameter and place it "X" distance behind the first loop, and come up with something similar to a PDL-II beam.

The second loop becomes the 'reflector'.

Then, one might add another loop ~10% smaller than the first loop and put it in front of the first loop and place "X" distance in front and have a three element quad beam.

The loop in front of the first loop now becomes the 'director'.

Actually, you would use the same spacing between these elements as you would a three element Yagi - to be correct ("X" distances).

Changing the position of the feedpoint of the first loop to either perpendicular or pointed to th the ground will change its polarization.

This may not be entirely accurate; but the idea is right.

Just playing with the possibilities here.

Maybe - that is what Homer is going to do next . . .
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Last edited by Robb; 12-05-2011 at 04:45 PM.

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  #24  
Old 12-05-2011, 04:31 PM
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i love the antenna design very much !!!!!! beautiful job on making it .

can i get one from ya ?

from looking at it , its gonna work awsome .


Homer BB got down got down breakaaaaaaaaa.


i cant wait for the other projects you got up ya sleeve !!!!!! congradulations to ya !!!!

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