firimari: I would like to solicit you to run X-11 with these changes; edge0=0.078642, edge1=0.130342, and dx=0.0965. I think that this is a very buildable design. My Ch.s are 14 thru 45, so I would like to shift to 14. Would like to see gain and swr curves. Thanks from a pea brain that can not get the hang of modeling.
Area 51 for Antenna Modelers & Builders (See Post #1)
This thread has been created strictly for Antenna Modelers and Builders who like to live not just on the leading edge but on the bleeding edge of antenna research and development.
Area 51 is for posting and discussion of any computer model of any experimental antenna by Antenna Modelers and Builders
Area 51 is not for casual builders or newcomers to ask questions or look for useable home antennas. Participants here are expected to fairly well "know their stuff".
If an antenna design is shown to be worthwhile for general public consumption we will move it out of Area 51 into the main Antenna Research & Development Forum.
Just remember what the ancient map makers wrote when they had no further info to illustrate: "Beyond here be dragons!"
Area 51 is for posting and discussion of any computer model of any experimental antenna by Antenna Modelers and Builders
Area 51 is not for casual builders or newcomers to ask questions or look for useable home antennas. Participants here are expected to fairly well "know their stuff".
If an antenna design is shown to be worthwhile for general public consumption we will move it out of Area 51 into the main Antenna Research & Development Forum.
Just remember what the ancient map makers wrote when they had no further info to illustrate: "Beyond here be dragons!"
1 - 20 of 1328 Posts
Thank you firimari for X-32. This is more than I could of hoped for. It will be a NET Gain of about 10 @ Ch.14, 11.5 @ Ch.30, and 11 @ Ch.45. Not bad for a 6"side for outer diamond and a 4" for the inner diamond with 1" feed gap. Thanks again.
X-032 to gh6 rev.1 dej
I just did a back to back. I have a GH6 rev.1 with Al-foil 27"X36" split reflector as the base line. and make up the D.E. of X-032.
-----GH6/X-032
Ch14 80/90
Ch21 100/90
Ch39 55/50
Ch41 70/85
Ch43 40/40
Ch44 40/40
Ch45 100/100
I just remover the GH6 D.E. and replaced it with the D.E. of the X-032. The X-032 looks like it works ok with the wrong reflector for a fast test.
I just did a back to back. I have a GH6 rev.1 with Al-foil 27"X36" split reflector as the base line. and make up the D.E. of X-032.
-----GH6/X-032
Ch14 80/90
Ch21 100/90
Ch39 55/50
Ch41 70/85
Ch43 40/40
Ch44 40/40
Ch45 100/100
I just remover the GH6 D.E. and replaced it with the D.E. of the X-032. The X-032 looks like it works ok with the wrong reflector for a fast test.
300ohm: If you make it for 2.4 Ghz., you may need 1/4 wave lenght separators between the diamonds. Google Quados.
RamKat: Is the feed to 75 ohms, and is it only off the 1/2 folded leg of each. I have a yagi that use's 1/2 folded. The feed is from the center of the dipole to the 1/2 folded leg. Have you tried flipping the bottom element to change the feed point space?
RamKat: Thank you for the info. If you do treat the two half folds as seperate antennas and then combine them, it will just make the phase lines move complex.
300ohm: Is there 182 cells that are 23 3/6" tall by 9 1/4"per cell? Not that I'm in a rush to make this one.
firimari: Take your cu. value and divide it by 5.77. About 10 *10^6 mhos.
Conductivity of Al. 37800000; Zn. 17000000; Silvers is the best 63000000
RamKat: I see that the reflector rod are in different spacing (3,4.17,4.64,and 3.57) just like you stated. My pea brain had a hard time with that, but after looking at the code (note I still do not know how to run 4nec2) and a piece graph paper I now get it. The next step would be like a dish.
holl_ands: Your trick, looks like a 1/4 wave matching section to me. If you would change the space between the excited wire. Z(in) to Z(match)={SQR[Z(in)*Z(out)]} to Z(out). So if the antenna is 450 ohms and the coax is 75 ohms then the 1/4 wave length match would be 184 ohms. For 184 ohms the space between the wire should be 2.32 * wire diameter.
Now you can take two 1/4 wave matching sections to make a unique balun. The ends to the a coax (unbalanced) are connected in parallel. The ends that to the antenna (balanced) are connected in series. How is that for a home made balun.
holl_ands:I agree there are many ways to connect, but they all do not give good out comes.
Is this a valid design, please check(this is at 75 ohms).
GW 1 3 -0.1 -0.5 0 0.1 0.5 0 0.04
GW 2 8 0 2.29 6 0 6.5 6 0.04
GW 3 1 0 2 6.29 0 2.29 6 0.04
GW 4 2 0 2 6.29 0 2 6.71 0.04
GW 5 1 0 2 6.71 0 2.29 7 0.04
GW 6 23 0 2.29 7 0 11.71 7 0.04
GW 7 1 0 11.71 7 0 12 6.71 0.04
GW 8 2 0 12 6.71 0 12 6.29 0.04
GW 9 1 0 12 6.29 0 11.71 6 0.04
GW 10 8 0 11.71 6 0 7.5 6 0.04
GW 11 8 0 -2.29 6 0 -6.5 6 0.04
GW 12 30 -3.9 -13.75 -9 -3.9 -.25 -9 0.125
GW 13 1 0 -2 6.29 0 -2.29 6 0.04
GW 14 2 0 -2 6.29 0 -2 6.71 0.04
GW 15 1 0 -2 6.71 0 -2.29 7 0.04
GW 16 23 0 -2.29 7 0 -11.71 7 0.04
GW 17 1 0 -11.71 7 0 -12 6.71 0.04
GW 18 2 0 -12 6.71 0 -12 6.29 0.04
GW 19 1 0 -12 6.29 0 -11.71 6 0.04
GW 20 8 0 -11.71 6 0 -7.5 6 0.04
GW 21 30 -3.9 -13.75 -4 -3.9 -0.25 -4 0.125
GW 22 30 0 -7.5 6 -0.1 -0.5 0 0.04
GW 23 30 0 -6.5 6 0.1 0.5 0 0.04
GW 24 30 0 -6.5 -6 0.1 0.5 0 0.04
GW 25 30 0.1 0.5 0 0 7.5 6 0.04
GW 26 30 -.1 -0.5 0 0 6.5 6 0.04
GW 27 30 0 -7.5 -6 -0.1 -0.5 0 0.04
GW 28 30 0 6.5 -6 -0.1 -0.5 0 0.04
GW 29 30 0 7.5 -6 0.1 0.5 0 0.04
GW 31 8 0 11.71 -6 0 7.5 -6 0.04
GW 32 8 0 2.29 -6 0 6.5 -6 0.04
GW 33 1 0 2 -6.29 0 2.29 -6 0.04
GW 34 2 0 2 -6.29 0 2 -6.71 0.04
GW 35 1 0 2 -6.71 0 2.29 -7 0.04
GW 36 23 0 2.29 -7 0 11.71 -7 0.04
GW 37 1 0 11.71 -7 0 12 -6.71 0.04
GW 38 2 0 12 -6.71 0 12 -6.29 0.04
GW 39 1 0 12 -6.29 0 11.71 -6 0.04
GW 40 8 0 -2.29 -6 0 -6.5 -6 0.04
GW 41 1 0 -2 -6.29 0 -2.29 -6 0.04
GW 42 2 0 -2 -6.29 0 -2 -6.71 0.04
GW 43 1 0 -2 -6.71 0 -2.29 -7 0.04
GW 44 23 0 -2.29 -7 0 -11.71 -7 0.04
GW 45 1 0 -11.71 -7 0 -12 -6.71 0.04
GW 46 2 0 -12 -6.71 0 -12 -6.29 0.04
GW 47 1 0 -12 -6.29 0 -11.71 -6 0.04
GW 48 8 0 -11.71 -6 0 -7.5 -6 0.04
GW 49 30 -3.9 -13.75 9 -3.9 -0.25 9 0.125
GW 50 30 -3.9 -13.75 4 -3.9 -0.25 4 0.125
GW 51 30 -3.9 0.25 9 -3.9 13.75 9 0.125
GW 52 30 -3.9 0.25 4 -3.9 13.73 4 0.125
GW 53 30 -3.9 0.25 -4 -3.9 13.75 -4 0.125
GW 54 30 -3.9 0.25 -9 -3.9 13.75 -9 0.125
GS 0 0 0.0254
GE 0
GW 1 3 -0.1 -0.5 0 0.1 0.5 0 0.04
GW 2 8 0 2.29 6 0 6.5 6 0.04
GW 3 1 0 2 6.29 0 2.29 6 0.04
GW 4 2 0 2 6.29 0 2 6.71 0.04
GW 5 1 0 2 6.71 0 2.29 7 0.04
GW 6 23 0 2.29 7 0 11.71 7 0.04
GW 7 1 0 11.71 7 0 12 6.71 0.04
GW 8 2 0 12 6.71 0 12 6.29 0.04
GW 9 1 0 12 6.29 0 11.71 6 0.04
GW 10 8 0 11.71 6 0 7.5 6 0.04
GW 11 8 0 -2.29 6 0 -6.5 6 0.04
GW 12 30 -3.9 -13.75 -9 -3.9 -.25 -9 0.125
GW 13 1 0 -2 6.29 0 -2.29 6 0.04
GW 14 2 0 -2 6.29 0 -2 6.71 0.04
GW 15 1 0 -2 6.71 0 -2.29 7 0.04
GW 16 23 0 -2.29 7 0 -11.71 7 0.04
GW 17 1 0 -11.71 7 0 -12 6.71 0.04
GW 18 2 0 -12 6.71 0 -12 6.29 0.04
GW 19 1 0 -12 6.29 0 -11.71 6 0.04
GW 20 8 0 -11.71 6 0 -7.5 6 0.04
GW 21 30 -3.9 -13.75 -4 -3.9 -0.25 -4 0.125
GW 22 30 0 -7.5 6 -0.1 -0.5 0 0.04
GW 23 30 0 -6.5 6 0.1 0.5 0 0.04
GW 24 30 0 -6.5 -6 0.1 0.5 0 0.04
GW 25 30 0.1 0.5 0 0 7.5 6 0.04
GW 26 30 -.1 -0.5 0 0 6.5 6 0.04
GW 27 30 0 -7.5 -6 -0.1 -0.5 0 0.04
GW 28 30 0 6.5 -6 -0.1 -0.5 0 0.04
GW 29 30 0 7.5 -6 0.1 0.5 0 0.04
GW 31 8 0 11.71 -6 0 7.5 -6 0.04
GW 32 8 0 2.29 -6 0 6.5 -6 0.04
GW 33 1 0 2 -6.29 0 2.29 -6 0.04
GW 34 2 0 2 -6.29 0 2 -6.71 0.04
GW 35 1 0 2 -6.71 0 2.29 -7 0.04
GW 36 23 0 2.29 -7 0 11.71 -7 0.04
GW 37 1 0 11.71 -7 0 12 -6.71 0.04
GW 38 2 0 12 -6.71 0 12 -6.29 0.04
GW 39 1 0 12 -6.29 0 11.71 -6 0.04
GW 40 8 0 -2.29 -6 0 -6.5 -6 0.04
GW 41 1 0 -2 -6.29 0 -2.29 -6 0.04
GW 42 2 0 -2 -6.29 0 -2 -6.71 0.04
GW 43 1 0 -2 -6.71 0 -2.29 -7 0.04
GW 44 23 0 -2.29 -7 0 -11.71 -7 0.04
GW 45 1 0 -11.71 -7 0 -12 -6.71 0.04
GW 46 2 0 -12 -6.71 0 -12 -6.29 0.04
GW 47 1 0 -12 -6.29 0 -11.71 -6 0.04
GW 48 8 0 -11.71 -6 0 -7.5 -6 0.04
GW 49 30 -3.9 -13.75 9 -3.9 -0.25 9 0.125
GW 50 30 -3.9 -13.75 4 -3.9 -0.25 4 0.125
GW 51 30 -3.9 0.25 9 -3.9 13.75 9 0.125
GW 52 30 -3.9 0.25 4 -3.9 13.73 4 0.125
GW 53 30 -3.9 0.25 -4 -3.9 13.75 -4 0.125
GW 54 30 -3.9 0.25 -9 -3.9 13.75 -9 0.125
GS 0 0 0.0254
GE 0
Thanks 300ohm. This was the first antenna that I made for the converter box back in March 2008. That was before I was turned on to the GH. It worked OK. I will have to try it again with 75 to 300 balun.
Request For Comments: Is X-032 ready for public use?
I just have to add my in put. For the newcomer. I would have him build X-032 (area 51). I just came from a friends and that is what we made in about 1hr. One needs a spine that is over 30". We used a 4'by 1/2" square stick and 1/4" dowel and 7' of 14 gauge steel wire. starting 1" down from the top of the square stick put in a nail for the top of the upper diamond. From there down 4 7/32" drilled a hole for the first spreader( 8 7/16" of 1/4 dowel). Then 7 13/32" drill 1/4" hole for the next spreader ( 6 3/8" of 1/4 dowel ). Now down 2 19/32 a 1/4" hole for the feed point spreader (2" of 1/4" dowel note that there needs to be two screws in it to attach the 75 to 300 balun) you are half way just add two more spreaders and to mirror the top two spreads and add the wire in the diamand shapes. This with a reflector will give you a 11dBi antenna.
I just have to add my in put. For the newcomer. I would have him build X-032 (area 51). I just came from a friends and that is what we made in about 1hr. One needs a spine that is over 30". We used a 4'by 1/2" square stick and 1/4" dowel and 7' of 14 gauge steel wire. starting 1" down from the top of the square stick put in a nail for the top of the upper diamond. From there down 4 7/32" drilled a hole for the first spreader( 8 7/16" of 1/4 dowel). Then 7 13/32" drill 1/4" hole for the next spreader ( 6 3/8" of 1/4 dowel ). Now down 2 19/32 a 1/4" hole for the feed point spreader (2" of 1/4" dowel note that there needs to be two screws in it to attach the 75 to 300 balun) you are half way just add two more spreaders and to mirror the top two spreads and add the wire in the diamand shapes. This with a reflector will give you a 11dBi antenna.
I will try to demonstrate the building of X-032. I will build and take pic.s, because the one from the weekend is 200 miles away.
Declassifying X-032
Build instructions for the driven element of X-032.
If your rabbit ears do not work, try this build.
Materials:
1 1/8" x 1 1/8" x 3' wooden post.
1/2" wooden dowel, 31" worth (I suggest going with 3 feet).
Two nails.
Two screws.
7' of 14 gauge copper wire (I used 2 pieces, both 3 1/2' in length. Joints were under the nails).
Instructions:
1) Start by marking the post at 5 7/32", 12 5/8", 17 3/4" and 25 5/32".
2) Drill 1/2" holes at these locations in the center of the post.
3) Rotate the post 90 degrees.
4) Place your nail on this side at 1" and 29 3/8" (Do not drive all the way in).
5) Place two screws at 15 3/16".
6) From the 1/2" dowel, cut two pieces 8 7/16" in length, as well as two pieces 6 3/8". (These will be used as spreaders)
7) On all four dowels, cut a notch with a saw into the end of each dowel for the wire to set into.
8) Install the 8 7/16" length dowels into the holes that you made at 5 7/32" and 25 5/32". Then, install the 6 3/8" dowels into the two remaining holes.
9) Install the 14 gauge wire onto the frame as shown in the provided picture. (Note that at crossing points, one wire is on one side of the post, and one wire is on the other)
![]()
Edit: 1/2" pvc (spine) and 1/4" (spreaders) driveway markers would make better frame materials, but this mornings dumpster dive did not yield this.
Build instructions for the driven element of X-032.
If your rabbit ears do not work, try this build.
Materials:
1 1/8" x 1 1/8" x 3' wooden post.
1/2" wooden dowel, 31" worth (I suggest going with 3 feet).
Two nails.
Two screws.
7' of 14 gauge copper wire (I used 2 pieces, both 3 1/2' in length. Joints were under the nails).
Instructions:
1) Start by marking the post at 5 7/32", 12 5/8", 17 3/4" and 25 5/32".
2) Drill 1/2" holes at these locations in the center of the post.
3) Rotate the post 90 degrees.
4) Place your nail on this side at 1" and 29 3/8" (Do not drive all the way in).
5) Place two screws at 15 3/16".
6) From the 1/2" dowel, cut two pieces 8 7/16" in length, as well as two pieces 6 3/8". (These will be used as spreaders)
7) On all four dowels, cut a notch with a saw into the end of each dowel for the wire to set into.
8) Install the 8 7/16" length dowels into the holes that you made at 5 7/32" and 25 5/32". Then, install the 6 3/8" dowels into the two remaining holes.
9) Install the 14 gauge wire onto the frame as shown in the provided picture. (Note that at crossing points, one wire is on one side of the post, and one wire is on the other)
Edit: 1/2" pvc (spine) and 1/4" (spreaders) driveway markers would make better frame materials, but this mornings dumpster dive did not yield this.
nielkaz: It looks like your X150 design is about the same as X032 up to Ch.40 then X150 is better. This is my code for your D. E. I'm not very good at 4nec2. Sorry.
CE Double Twin Diamond
GW 1 3 0 -1 0 0 1 0 0.041
GW 2 6 0 -1 0 0 -5 4 0.041
GW 3 6 0 -5 4 -0.25 0 9.25 0.041
GW 4 6 -0.25 0 9.25 0 2.8 12 0.041
GW 5 6 0 2.8 12 0 0 16 0.041
GW 6 6 0 0 16 0 -2.8 12 0.041
GW 7 6 0 -2.8 12 0.25 0 9.25 0.041
GW 8 6 0.25 0 9.25 0 5 4 0.041
GW 9 6 0 5 4 0 1 0 0.041
GW 10 6 0 1 0 0 5 -4 0.041
GW 11 6 0 5 -4 -0.25 0 -9.25 0.041
GW 12 6 -0.25 0 -9.25 0 -2.8 -12 0.041
GW 13 6 0 -2.8 -12 0 0 -16 0.041
GW 14 6 0 0 -16 0 2.8 -12 0.041
GW 15 6 0 2.8 -12 0.25 0 -9.25 0.041
GW 16 6 0.25 0 -9.25 0 -5 -4 0.041
GW 17 6 0 -5 -4 0 -1 0 0.041
GS 0 0 0.0254
GE 0
EK
LD 5 0 0 0 5.8e7 0
EX 0 1 2 0 1 0
GN -1
FR 0 1 0 0 470 40
XQ
EN
CE Double Twin Diamond
GW 1 3 0 -1 0 0 1 0 0.041
GW 2 6 0 -1 0 0 -5 4 0.041
GW 3 6 0 -5 4 -0.25 0 9.25 0.041
GW 4 6 -0.25 0 9.25 0 2.8 12 0.041
GW 5 6 0 2.8 12 0 0 16 0.041
GW 6 6 0 0 16 0 -2.8 12 0.041
GW 7 6 0 -2.8 12 0.25 0 9.25 0.041
GW 8 6 0.25 0 9.25 0 5 4 0.041
GW 9 6 0 5 4 0 1 0 0.041
GW 10 6 0 1 0 0 5 -4 0.041
GW 11 6 0 5 -4 -0.25 0 -9.25 0.041
GW 12 6 -0.25 0 -9.25 0 -2.8 -12 0.041
GW 13 6 0 -2.8 -12 0 0 -16 0.041
GW 14 6 0 0 -16 0 2.8 -12 0.041
GW 15 6 0 2.8 -12 0.25 0 -9.25 0.041
GW 16 6 0.25 0 -9.25 0 -5 -4 0.041
GW 17 6 0 -5 -4 0 -1 0 0.041
GS 0 0 0.0254
GE 0
EK
LD 5 0 0 0 5.8e7 0
EX 0 1 2 0 1 0
GN -1
FR 0 1 0 0 470 40
XQ
EN
nielkaz: I used the 9.25, because if I make it with spreaders the wire will drift up and will not hold your shape. I do not think it will change things that much and it will not need to be pinned at the crossing.
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