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  #25  
Old 12-05-2011, 05:50 PM
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Originally Posted by 2RT307 View Post
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!

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RT307
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And don't worry about me, while I'm breathin' I'll be tinkerin'
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  #26  
Old 12-05-2011, 05:52 PM
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Originally Posted by Needle Bender View Post
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
Now that's interesting. I'll have to think on this some more. I'll look around for this kind of info. You have any links?
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  #27  
Old 12-05-2011, 05:55 PM
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Originally Posted by Robb View Post
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 . . .
With winter coming on it won't be much I can do outside, but you'll have to notice the ease with which this thing could be put on a boom.
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  #28  
Old 12-05-2011, 06:01 PM
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Originally Posted by High Voltage Mobile NJ View Post
i love the antenna design very much !!!!!! beautiful job on making it .

can i get one from ya ?
Well sure you can. Here it is:

The dimensions are dictated by the length of the wire, which is viewable in the photo of the calculator I used to determine the wire length, spreaders, etc.

The parts in the above photos are:

two sets of 2" x 8-32 SS screws and nuts with washers.
3/4" soc PVC caps qty 3
3/4" tee all soc
2 feet long 1-1/2" PVC tube
3" x 1-1/2" adapter
6 inch length of 3" PVC tube
one stick of 10' x 3/4" PVC
2 sticks of 1/2" x 10' EMT (conduit)
prepared 6' piece of 75 Ohm coax
some tape to wrap around the EMT to take out slack between its diameter and the ID of the 3/4" PVC.

1. Take the 3 x 1.5 adapter and remove the stop inside the 1.5" end so the 1-1/2" PVC tube can go all the way through a couple inches. This is to make it sturdier than if the stop is in place. Glue the two pieces together as shown in the photos. I used self-drilling screws also for reinforcement.

2. Glue the 6" x 3" PVC tube into the adapter. I used self-drilling screws for reinforcement.

3. Drill two sets of holes into the 3" x 6" PVC tube at 90 to each other offset from each other.

4. Insert the two joints of EMT through the offset holes. Be sure they are inserted half way their lengths. This will form the characteristic cross shape of Quad spreaders. Secure them to each other in the center as you see done in the above photo. This provides stability and assures the spreaders remain in place.

5. Cut the 10' joint of 3/4" PVC into 4 equal parts - 2.5' each. Place caps on three of them, and the tee on the fourth.

6. Drill holes through the ends/caps of the three capped pieces of PVC so the wire can pass through them. Drill two holes, one in each end of the tee for the connector end of the loop as shown in the photos above.

7. Wrap sufficient amount of tape around the EMT spreaders to remove slack between the 3/4" x 2.5' sections when they are slipped onto the spreaders. Do this near the end of the EMT, and at 49" out from the outside edge of the 3" PVC center tube.

8. Slide the PVC sections onto the four EMT spreaders. Thread the pre- measured, pre-cut wire through the holes of the three caps securing the ends of the loop wire with the SS screws on the two sides/ends of the tee. Slide the four PVC sections out equally from the center until the wire is taut.

9. attach 6' piece of 75 Ohm coax. Tape or zip-tie this along the spreader . Done.

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  #29  
Old 12-05-2011, 06:56 PM
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very nice ! did you have any place for wire length adjustment ? or just use the 36 ft 8 1/8 inch recommended length ?

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  #30  
Old 12-05-2011, 07:18 PM
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So far, just the recommended length. When i get the analyzer on it I may have to make adjustments. We'll see.
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Old 12-05-2011, 07:28 PM
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Quote:
Originally Posted by HomerBB View Post
So far, just the recommended length. When i get the analyzer on it I may have to make adjustments. We'll see.
If/when you do; could you also check it for 2:1 VSWR please?
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  #32  
Old 12-05-2011, 07:44 PM
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If/when you do; could you also check it for 2:1 VSWR please?
Sho 'nuff
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