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Model colection

ghz24

Member
Mar 19, 2012
75
10
18
ghz24.freeshell.org
First I'd like to encourage anyone to post models here.
I consider posting a model here virtually equal to placing it in the public domain.
Use any model that I post that you like for what ever purpose you like.
If you want to protect your model from others my advice is don't post it.
If I post work from someone else I will credit their work.

Starting out building models can be overwhelming ,but running an existing model is relatively easy
Just copy the "code" for the model paste into a text file and rename or save as XXXXX.nec move it to the models folder of 4nec2 and open it with 4nec2 (the little folder icon on the left).
Click the calculator icon or hit F-7 and pick far field pattern and then Generate.
At first I learned more from tinkering with other peoples models than anything else .
It's also nice to have a template that when you feel ready you can just paste in the wires ect. and not worry if you forgot a critical line or got them out of order.
I was going to just post free space models but it's easy enough to change to any ground desired.
By convention one always starts with the simple antenna first, a dipole perhaps?
No, I think I'll come back to dipoles later there are examples included in the stock models included at install.
I think I'll honor hommers efforts here and use his build of a moxon made from an old walker as the first model posted here. It is also scratch built with variables in mind and pretty easy to dissect and follow.
Model 1

Code:
CM CB  (11 meter) Moxon from Hommer BBs build/measurements.
CM AGT=1.006 (0.02 dB).
CM y is half the width of the antenna
CM a is the reflector end length
CM b is radiator end length
CM g is for gap
CE
SY a=29.5
SY b=20.75
SY y=77.5
SY g=5.5
GW    1    9    0    -y    0    0    y    0    0.375
GW    2    3    0    y    0    a    y    0    0.375
GW    3    3    a+g    y    0    a+g+b    y    0    0.375
GW    4    9    a+g+b    y    0    a+g+b    -y    0    0.375
GW    5    3    0    -y    0    a    -y    0    0.375
GW    6    3    a+g    -y    0    a+g+b    -y    0    0.375
GS    0    0    0.0254
GE    0
GN    -1
EK
EX    0    4    5    0    1    0    0
FR    0    0    0    0    27.18    0
EN

Same Moxon above moderate real ground.

Code:
CM CB  (11 meter) Moxon dimensions from Homer BB
CM Model by GHz24
CM AGT=1.01 (0.02 dB).
CE
SY a=29.5
SY b=20.75
SY y=77.5
SY g=5.5
SY agl=240
GW    1    9    0    -y    0+agl    0    y    0+agl    0.375
GW    2    3    0    y    0+agl    a    y    0+agl    0.375
GW    3    3    a+g    y    0+agl    a+g+b    y    0+agl    0.375
GW    4    9    a+g+b    y    0+agl    a+g+b    -y    0+agl    0.375
GW    5    3    0    -y    0+agl    a    -y    0+agl    0.375
GW    6    3    a+g    -y    0+agl    a+g+b    -y    0+agl    0.375
GS    0    0    0.0254
GE    1
GN    2    0    0    0    4    0.003
EK
EX    0    4    5    0    1    0    0
FR    0    0    0    0    27.18    0
EN

Many of my models are designed or modified to show the answer to some question (or try).
How far apart should I stack moxons ? Should I bother if I can only go up ?? feet?
What if I delay the feed to one of the antennas?
What about a staggered stack?

I never got this model to show the qualities it should be capable of. (great f/b ratio)
maybe I didn't try the right combination of stager and delay.
If any one finds a nice version of this post the SY values needed to change.
Wasn't real happy with the stacks I don't think it's worth the trouble .

Code:
CM CB Moxon stack from Homer BB s dimensions
CM Model by GHz24
CM AGT=1.0 (0.02 dB).
CE
SY a=29.5    'reflector end length in inches
SY b=20.75    'driven element end  length in inches
SY y=77.5    'Half the length of the antenna in inches
SY g=5.5    'Gap between reflector end and Driven element end in inches
SY sep=295.75    'separation between upper and lower elements in inches
SY u=0    'Phase lag for upper element in degrees
SY L=-0    'Phase lag for lower element in degrees
SY s=0    'Stagger in inches (upper element)
SY agl=120    'Height of lower element above ground
GW    1    9    0    -y    0+agl    0    y    0+agl    0.375
GW    2    3    0    y    0+agl    a    y    0+agl    0.375
GW    3    3    a+g    y    0+agl    a+g+b    y    0+agl    0.375
GW    4    9    a+g+b    y    0+agl    a+g+b    -y    0+agl    0.375
GW    5    3    0    -y    0+agl    a    -y    0+agl    0.375
GW    6    3    a+g    -y    0+agl    a+g+b    -y    0+agl    0.375
GW    11    9    0+s    -y    0+sep+agl    0+s    y    0+sep+agl    0.375
GW    12    3    0+s    y    0+sep+agl    a+s    y    0+sep+agl    0.375
GW    13    3    a+g+s    y    0+sep+agl    a+g+b+s    y    0+sep+agl    0.375
GW    14    9    a+g+b+s    y    0+sep+agl    a+g+b+s    -y    0+sep+agl    0.375
GW    15    3    0+s    -y    0+sep+agl    a+s    -y    0+sep+agl    0.375
GW    16    3    a+g+s    -y    0+sep+agl    a+g+b+s    -y    0+sep+agl    0.375
GS    0    0    0.0254
GE    1
GN    2    0    0    0    4    0.003
EK
EX    0    4    5    0    cos(L)    sin(L)    0
EX    0    14    5    0    cos(u)    sin(u)    0
FR    0    0    0    0    27.18    0
EN

Notice the first GW line
GW 1 9 0 -y 0+agl 0 y 0+agl 0.375
has the Z coordinates (both ends) of 0+agl obviously the zero is redundant it's a remnant of rapid modification with the new nec editor. I'll address that soon. I should have removed them but I didn't want to chance garbling the model, and they still work fine.
 

This is a simple variable slope dipole vertical or horizontal or any angle in between.
AGT 0.996 (-0dB)
Code:
CM 11 meter Sloping Dipole, by ghz24
CM z is length of the dipole
CM a is the angle of slope in degrees 90 for vertical 0 for horizontal
CE
SY z=210
SY a=80
SY rad=0.0404
GW   1   9   0   0   0   cos(a)*z   0   sin(a)*z   rad
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   5   0   1   0   0
FR   0   0   0   0   27.18   0
EN

Same as above but over "real" (sommerfeld) "moderate" ground
AGT 0.996 (-0dB)
Code:
CM 11 meter dipole Tilted by ghz24
CM z is length of the dipole
CM a is the angle of slope in degrees 90 for vertical 0 for horizontal
CM agl is height above ground 
CE
SY z=210
SY a=0
SY agl=270  
GW   1   9   0   0   0+agl   cos(a)*-z   0   sin(a)*z+agl   0.0404
GS   0   0   0.0254
GE   1
GN   2   0   0   0   4   0.003
EK
EX   0   1   5   0   1   0   0
FR   0   0   0   0   27.18   0
EN
[CODE]
 
Some phased arrays.

This is twin dipoles fed in phase with variable separation. "Broadside array"
Gain 5.68 dBi bw. 64 deg. f/b 1
SWR 1.33
AGT 0.996 (-0dB)
Code:
CM 11 meter cb by ghz24
CM sep is half actual separation of dipoles
CM z is half the dipoles length
CM a is the angle of phase feed delay
CE
SY sep=103.1093
SY z=107.4359
GW   1   9   0   sep   0   0   sep   2z   0.05260011
GW   11   9   0   -sep   0   0   -sep   2z   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   5   0   1   0   0   0
EX   0   11   5   0   1   0   0   0
FR   0   0   0   0   27.18   0
EN
This is an end fire array with variable phase feed.SWR is a little high but it's potentially reversable.
It is customary to make directional antenna models so that the main lobe of gain is pointed at positive X numbers
But this model was to be steerable so I modified the broadside array from above.
Gain 6.5 dBi , bw.116 deg. , f/b 3.73 dB
SWR 2.15
AGT 0.999 (-0dB)
Code:
CM 11 meter cb by ghz24
CM sep is half actual separation of dipoles
CM z is half the dipoles length
CM a is   the angle of phase feed delay
CE
SY sep=54
SY z=103
SY a=90   
GW   1   17   0   sep   -z   0   sep   z   0.05260011
GW   11   17   0   -sep   -z   0   -sep   z   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   9   0   1   0   0
EX   0   11   9   0   cos(a)   sin(a)   0
FR   0   0   0   0   27.18   0
EN
Same maodel as above but front element cut down to get almost perfect match, but no longer reversable.
Gain 6.29 dBi, BW 144 deg , f/b 14.9 dB
SWR 1 50 real and -0.17j reactive
AGT 0.999 (-0dB)
Code:
CM 11 meter cb by ghz24
CM 2 asymetric dipoles fed 90 degrees phase delayed  
CM sep is distance from a central point
CM zf is length of front element  
CM zr is length of rear element
CE  
SY sep=42
SY zf=100.1157
SY zr=104.9583
GW   1   17   0   sep   -zf   0   sep   zf   0.05260011
GW   2   17   0   -sep   -zr   0   -sep   zr   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   9   0   1   0   0
EX   0   2   9   0   0   1   0
FR   0   0   0   0   27.18   0
EN
 
The super scanner

I originally was mistaken about how this was fed.
I spent a lot of processor cycles looking at phased versions.
This is fed like the original, only one hot element at a time (or all for omni).
This one was named stock and was one of the last ones I made ,so it should be at least close to the right dimensions.
It is in free space but it is ready for a ground, use new nec editor to add a ground and save as ....
xz
A quick word about the editors, they each have their uses.
Select which one you are using in the main window under settings.


The notepad editor is good for importing wires from other files (copy/paste) not very user friendly.

The NEC editor is very useful for disecting a model the fields and card types are labeled for you and if you click on a GW (wire)
it highlights it on the 3D model on the geometry window (f-3) so you can see where in the model that wire is.
Changes made in this editor are immediately reflected in the geometry window also, so you can see if the changes (you make) have the desired result.
Good editor for quick mods. A little more user friendly.

The geometry editor is good for rotating/sliding and rescaling sets of existing wires. It can't handle variables (SY cards) so it can be used to strip the variables out of a model and create a numbers only model (any model saved with the geo-editor will be numbers only). I'm not a fan of scratch built geo-editor models they usually need cleaned up by hand anyway.

The "new" NEC editor is very powerful and user friendly. It is menu driven, tabs separate the different sections ,grounds are easily selected /modified here with drop down menu options.
over all a very useful even awesome editor.
You can add variables to an existing model by highlighting whole columns or sets of mumbers
and (right click) and "add or multiply by same number" (the variable)
define the variable under the variables tab and you are ready. This is where the" 0+agl" terms in the moxon came from.
It only has one "glitch" I wish wasn't there.
In the model below I used the (old school) ' mark to comment out the EX lines (cards) that I wanted the program to temporarily ignore
the new nec editor is so user friendly that if it finds this "comment" card out of place
it will replace the ' with a proper CM and move it to the comment section.
to use the EX card again you must cut and paste it back to the proper location with notepad.
Any line that starts with ' will be saved to the comment section by this editor.
That's the good bad and ugly of the editors.

Complex sets of wires are easiest to create in the "geometry builder", rotated and slid in the geo-editor
and finished/polished in one or both of the NEC editors.
The geometry builder is great it always saves your build as build.nec in the last folder you opened a file from (and overwrites the old build.nec).


Code:
CM 11 meter cb by ghz24
CM "w" is length of the mast
CM "sep" is distance to the dipoles from a central point (Mast)  
CM "z" is the height of one half of total dipoles height  
CM mastradfac is mast radius factor to change the radius of the mast
CM agl is above ground level (in inches)  
CM free space  BUT no ground selected   
CE
SY sep=38.283
SY z=102.81
SY w=-130
SY mastradfac=2
SY agl=140
GW   1   9   sin(30)*sep   sin(60)*sep   0+agl   sin(30)*sep   sin(60)*sep   2z+agl   0.05260011
GW   2   9   sin(30)*sep   -sin(60)*sep   0+agl   sin(30)*sep   -sin(60)*sep   2z+agl   0.05260011
GW   3   9   -sep   0   0+agl   -sep   0   2z+agl   0.05260011
GW   4   9   0   0   w+agl   0   0   z+agl   1*mastradfac
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   5   0   1   0   0
'EX   0   2   5   0   1   0   0
'EX   0   3   5   0   1   0   0
FR   0   0   0   0   27.18   0
EN
This one is my experimental (play) model.
I used it for a lot of beam steering and phasing tests.

Code:
CM 11 meter cb by ghz24
CM "sep" is distance to the dipoles from a central point (Mast)  
CM "z" is the height of one half of total dipoles height  
CM EX   0   3   5   0   1   0 new nec editor moved this line here
CM I copied it back
CE
SY sep=38.283
SY z=102.81
GW   1   9   sin(30)*sep   sin(60)*sep   0   sin(30)*sep   sin(60)*sep   2z   0.05260011
GW   2   9   sin(30)*sep   -sin(60)*sep   0   sin(30)*sep   -sin(60)*sep   2z   0.05260011
GW   3   9   -sep   0   0   -sep   0   2z   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   5   0   1   0   0
EX   0   2   5   0   1   0   0
'EX   0   3   5   0   1   0
FR   0   0   0   0   27.18   0
EN
The cold element ( GW 3 here) acts as a director. With almost 7 dBi I wonder why "they" fed it one element at a time to get less gain.
 
This is a 4 element phase steerable array.
When I became dissapointed with the super scanner I thought maybe, I could combine 2 sets of the phased dipoles togather. I don't know of the history of this antenna.
I doubt it has remained unconcieved until now. However I'm not aware of a commercial version.
Building the phase harness/relay system would be the trick. It may be better to use 2 of the reversable phased dipoles
and use either the north /south set or the east /west set , leaving the unused elements cold and just loose about a dB.
That arangement would also cut the directions from 8 to 4.
Comment out the EX lines for either n/s or e/w to see this simpler feed.
Code:
CM 11 meter cb by ghz24
CM 4 element variable phased array 
CM variables n,e,s and w are for North East South and West
CM number value is the angle of delay
CM to steer north n=0 e=w=45 s=90 
CM to steer Southeast s=e=0 n=w=90
CM sep is distance from center point 
CM z is length of dipole element
CE
SY sep=42
SY z=101.5
SY n=0
SY e=90
SY s=90
SY w=0
GW   1   9   0   sep   0   0   sep   2z   0.05260011
GW   2   9   sep   0   0   sep   0   2z   0.05260011
GW   3   9   0   -sep   0   0   -sep   2z   0.05260011
GW   4   9   -sep   0   0   -sep   0   2z   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   5   0   cos(n)   sin(n)   0
EX   0   2   5   0   cos(e)   sin(e)   0
EX   0   3   5   0   cos(s)   sin(s)   0
EX   0   4   5   0   cos(w)   sin(w)   0
FR   0   0   0   0   27.18   0
EN
For comparison (and another simpler feed ) here is a 4 element with the unexcited elements acting as reflectors
Code:
CM 11 meter cb by ghz24
CE
SY sep=50
SY z=103.75
GW   1   17   sep   0   -z   sep   0   z   0.05260011
GW   2   17   0   sep   -z   0   sep   z   0.05260011
GW   3   17   -sep   0   -z   -sep   0   z   0.05260011
GW   4   17   0   -sep   -z   0   -sep   z   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   9   0   1   0   0
EX   0   2   9   0   1   0
'EX   0   3   9   0   1   0
'EX   0   4   9   0   1   0
FR   0   0   0   0   27.18   0
EN
 
Astroplane
I posted an astroplane model on nseepcs ap thread (as did he).
I think this is the most adjustable model I designed.
I never found anything remarkable about this antenna other than it's not that omni-directional.
maybe someone can correct the dimensions and demonstrate the qualities that I missed.
I'm not done playing with this model yet.
Code:
CM 11 meter cb by ghz24
CE
SY z=62.85974   'z is driven element length
SY rh=-86.8202   'rh is ring height
SY zp=6.972382   'zp is feed gap
SY rsf=0.413083   'rsf changes ring diameter
SY ch=9.221404   'ch is capacitance hat length
SY ml=-200   'ml is mast length
SY pph=rh+(rh*-0.5)   'pph is pinch point height
SY psf=0.97498   'psf is pinch factor .percentage : 1=no pinch
SY ppy=(30*rsf-zp)*psf  'ppy is a work around (not for adjustment)
GW   1   1   0   0   0   0   -zp   0   0.48
GW   2   67   0   0   0   0   0   ml   0.75
GW   3   1   0   0   0   0   zp   0   .5
GW   4   7   0   zp   0   0   ppy   pph   .25
GW   5   7   0   -zp   0   0   -ppy   pph   .25
GW   6   7   0   ppy   pph   0   30*rsf   rh   0.25
GW   7   7   0   -ppy   pph   0   -30*rsf   rh   0.25
GW   8   9   0   zp   0   0   zp   z   0.25
GW   9   1   0   zp   z   0   zp+ch   z   0.25
GW   10   1   0   zp   z   ch   zp   z   0.25
GW   11   1   0   zp-ch   z   0   zp   z   0.25
GW   12   1   0   zp   z   -ch   zp   z   0.25
GW   100   1   29.99994*rsf   0*rsf   0+rh   27.7163225*rsf   11.4804889*rsf   0+rh   0.25
GW   101   1   27.7163225*rsf   11.4804889*rsf   0+rh   21.2131466*rsf   21.2131466*rsf   0+rh   0.25
GW   102   1   21.2131466*rsf   21.2131466*rsf   0+rh   11.4804889*rsf   27.7163225*rsf   0+rh   0.25
GW   103   1   11.4804889*rsf   27.7163225*rsf   0+rh   0*rsf   29.99994*rsf   0+rh   0.25
GW   104   1   0*rsf   29.99994*rsf   0+rh   -11.480489*rsf   27.7163225*rsf   0+rh   0.25
GW   105   1   -11.480489*rsf   27.7163225*rsf   0+rh   -21.213147*rsf   21.2131466*rsf   0+rh   0.25
GW   106   1   -21.213147*rsf   21.2131466*rsf   0+rh   -27.716323*rsf   11.4804889*rsf   0+rh   0.25
GW   107   1   -27.716323*rsf   11.4804889*rsf   0+rh   -29.99994*rsf   0*rsf   0+rh   0.25
GW   108   1   -29.99994*rsf   0*rsf   0+rh   -27.716323*rsf   -11.480489*rsf   0+rh   0.25
GW   109   1   -27.716323*rsf   -11.480489*rsf   0+rh   -21.213147*rsf   -21.213147*rsf   0+rh   0.25
GW   110   1   -21.213147*rsf   -21.213147*rsf   0+rh   -11.480489*rsf   -27.716323*rsf   0+rh   0.25
GW   111   1   -11.480489*rsf   -27.716323*rsf   0+rh   0*rsf   -29.99994*rsf   0+rh   0.25
GW   112   1   0*rsf   -29.99994*rsf   0+rh   11.4804889*rsf   -27.716323*rsf   0+rh   0.25
GW   113   1   11.4804889*rsf   -27.716323*rsf   0+rh   21.2131466*rsf   -21.213147*rsf   0+rh   0.25
GW   114   1   21.2131466*rsf   -21.213147*rsf   0+rh   27.7163225*rsf   -11.480489*rsf   0+rh   0.25
GW   115   1   27.7163225*rsf   -11.480489*rsf   0+rh   29.99994*rsf   0*rsf   0+rh   0.25
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   1   0   1   0   0
FR   0   0   0   0   27.18   0
EN
 
This is a starduster type ground plane with 3 adjustable radials
I think this model is pretty well behaved but interprete results carefully and check AGT.
The AGT test is found after you hit the calculate or (F-7) click off of "expert settings" to reveal the "run AGT test" check box.
Running the AGT test puts the model over perfect ground (if it was over any ground)
So the gain will be inflated and the pattern distorted find the results in the main window run again without the AGT to get the actual gain and pattern.

Code:
CM 11 meter cb by ghz24 ground plane
CM z is the radiating element lenght  
CM r is the radial length
CM t is the angle of the radials in degrees, positive=up negative=down 0=horizontal
CM t values to close to 90 or -90 are suspect and may effect the AGT
CE
SY r=103.9823
SY z=104
SY t=-45
GW   1   1   0   0   0   0   0   3   0.0375
GW   2   35   0   0   3   0   0   z   0.05260011
GW   6   35   0   0   0   sin(30)*cos(t)*r   sin(60)*cos(t)*r   sin(t)*r   0.05260011
GW   7   35   0   0   0   sin(30)*cos(t)*r   -sin(60)*cos(t)*r   sin(t)*r   0.05260011
GW   8   35   0   0   0   cos(t)*-r   0   sin(t)*r   0.05260011
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   1   0   1   0   0
FR   0   0   0   0   27.18   0
EN
 
Super penetrator
This model (with long radials) shows very promising gain. Pretty sure this is the highest gain omni I have seen at 11 meter (that is actually deployable)
3.2 dBi may seem small compared to the outrageous claims that are made about some verticals like A99s,
but in the cruel environment of freespace it is high
This model shows why we need to consider ground effect, the long radials cheat (I think) and make an artificial ground
to achieve this, and once it is placed 20 ft.over (real moderate) ground most the extra gain melts away (vs 1/4 wave radials).

Perfect ground shows an extra dB of gain though.
It is not dimensioned to be a penetrator but is easily altered to be one

Code:
CM 11 meter Groundplane , by ghz24
CM z is vertical element length 1
CM gr is ground radial length  
CM cap is cap hat length  
CE
SY z=245.1281
SY gr=216.48
SY cap=7.604132
GW   1   59   0   0   0   0   0   z   1
GW   2   29   0   0   0   0   gr   0   0.2
GW   3   29   0   0   0   0   -gr   0   0.2
GW   4   29   0   0   0   gr   0   0   0.2
GW   5   29   0   0   0   -gr   0   0   0.2
GW   6   3   0   0   z   0   cap   z   0.2
GW   7   3   0   0   z   0   -cap   z   0.2
GW   8   3   0   0   z   cap   0   z   0.2
GW   9   3   0   0   z   -cap   0   z   0.2
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   1   0   1   0   0   0
FR   0   0   0   0   27.18   0
EN
This is a model that was on the way to being the sigma 4 it's not really a penetrator but may be useful to those interested in the effect of radial slope
Note the AGT warning.


Code:
CM 11 meter cb by ghz24
CM RL is radial length  
CM z is element height  
CM t is angle of radials, negative values slope down positive values slope up
CM warning changing t alters AGT rapidly ,interpret results very carefully!
CE
SY RL=108.0595
SY z=338.5529
SY t=75
GW   1   27   0   0   0   0   0   z   0.1
GW   6   9   0   0   0   0   -cos(t)*-RL   sin(t)*RL   0.1
GW   7   9   0   0   0   0   cos(t)*-RL   sin(t)*RL   0.1
GW   8   9   0   0   0   cos(t)*-RL   0   sin(t)*RL   0.1
GW   8   9   0   0   0   -cos(t)*-RL   0   sin(t)*RL   0.1
GS   0   0   0.0254
GE   0
GN   -1
EK
EX   0   1   1   0   1   0   0   0
FR   0   0   0   0   27.18   0
EN
 
The Sigma 4
The DB, I really liked the mod you applied to the sigma4 ring. The unit value ring was quite elegant.
Scratch built models are often more elegant than those with quickly added functionality.
I was anxious to see the effect of changing the ring and went for the quick and ugly (but functional) approach.
I hope you'll post your modified sigma model here as well.

I also noticed (again) the bedknob on the top of the sigma4
i had planned to add a bedknob to a copy of the sigma at some time.
Your approach inspired me so here is a cap hat for the sigma4 (and other suitable models)


Code:
CM not a stand alone model it's a paste in piece
CM Z must be present as the top most point to attach this cap hat to your model
CM r is ring radius, r must not be used elsewhere in the model
CM
SY r=2
CE
GW   200   1   0   0   z   -0.3826772*r   0   0.07610236*r+z   0.19685039
GW   201   1   -0.3826772*r   0   0.07610236*r+z   -0.707126*r   0   0.29287402*r+z   0.19685039
GW   202   1   -0.707126*r   0   0.29287402*r+z   -0.9238976*r   0   0.61732283*r+z   0.19685039
GW   203   1   -0.9238976*r   0   0.61732283*r+z   -r   0   r+z   0.19685039
GW   204   1   -r   0   r+z   -0.9238976*r   0   1.38267717*r+z   0.19685039
GW   205   1   -0.9238976*r   0   1.38267717*r+z   -0.707126*r   0   1.70712598*r+z   0.19685039
GW   206   1   -0.707126*r   0   1.70712598*r+z   -0.3826772*r   0   1.92389764*r+z   0.19685039
GW   207   1   -0.3826772*r   0   1.92389764*r+z   0   0   2*r+z   0.19685039
GW   208   1   0   0   2*r+z   0.38267717*r   0   1.92389764*r+z   0.19685039
GW   209   1   0.38267717*r   0   1.92389764*r+z   0.70712598*r   0   1.70712598*r+z   0.19685039
GW   210   1   0.70712598*r   0   1.70712598*r+z   0.92389764*r   0   1.38267717*r+z   0.19685039
GW   211   1   0.92389764*r   0   1.38267717*r+z   r   0   r+z   0.19685039
GW   212   1   r   0   r+z   0.92389764*r   0   0.61732283*r+z   0.19685039
GW   213   1   0.92389764*r   0   0.61732283*r+z   0.70712598*r   0   0.29287402*r+z   0.19685039
GW   214   1   0.70712598*r   0   0.29287402*r+z   0.38267717*r   0   0.07610236*r+z   0.19685039
GW   215   1   0.38267717*r   0   0.07610236*r+z   0   0   z   0.19685039
GW   250   1   0   0   z   0   0.38267717*r   0.07610236*r+z   0.19685039
GW   251   1   0   0.38267717*r   0.07610236*r+z   0   0.70712598*r   0.29287402*r+z   0.19685039
GW   252   1   0   0.70712598*r   0.29287402*r+z   0   0.92389764*r   0.61732283*r+z   0.19685039
GW   253   1   0   0.92389764*r   0.61732283*r+z   0   r   r+z   0.19685039
GW   254   1   0   r   r+z   0   0.92389764*r   1.38267717*r+z   0.19685039
GW   255   1   0   0.92389764*r   1.38267717*r+z   0   0.70712598*r   1.70712598*r+z   0.19685039
GW   256   1   0   0.70712598*r   1.70712598*r+z   0   0.38267717*r   1.92389764*r+z   0.19685039
GW   257   1   0   0.38267717*r   1.92389764*r+z   0   0   2*r+z   0.19685039
GW   258   1   0   0   2*r+z   0   -0.3826772*r   1.92389764*r+z   0.19685039
GW   259   1   0   -0.3826772*r   1.92389764*r+z   0   -0.707126*r   1.70712598*r+z   0.19685039
GW   250   1   0   -0.707126*r   1.70712598*r+z   0   -0.9238976*r   1.38267717*r+z   0.19685039
GW   251   1   0   -0.9238976*r   1.38267717*r+z   0   -r   r+z   0.19685039
GW   252   1   0   -r   r+z   0   -0.9238976*r   0.61732283*r+z   0.19685039
GW   253   1   0   -0.9238976*r   0.61732283*r+z   0   -0.707126*r   0.29287402*r+z   0.19685039
GW   254   1   0   -0.707126*r   0.29287402*r+z   0   -0.3826772*r   0.07610236*r+z   0.19685039
GW   255   1   0   -0.3826772*r   0.07610236*r+z   0   0   z   0.19685039
 
I think I'll honor hommers efforts here

The DB, I really liked the mod you applied to the sigma4 ring. The unit value ring was quite elegant.
Scratch built models are often more elegant than those with quickly added functionality.
...
I hope you'll post your modified sigma model here as well.

My modification to ghz's Sigma 4 model with lengths based on the data HomerBB told me he used for his Vector clone (as close as I could get). This is modeled 1 wavelength over the so called "average ground".

Code:
CM 11 meter cb by ghz24 and The DB
CM Potential acute angle issue fixed, The DB, 2/3/15
CM Added a height adjustment variable, The DB, 2/3/15
CM Made the ring diameter changes more intuitive, The DB, 2/3/15
CE
SY z = 357    'driven element length in inches (need to add zp variable length to this)
SY rh = 105.6    'ring height above bottom of antenna in inches
SY zp = 12    'avoid segment errors
SY rsf = 15.5    'changes ring diameter, radius in inches
SY ah = 432    'changes the hight of the antenna, in inches
GW    1    1    0    0    0+ah    0    0    zp+ah    0.1226
GW    2    67    0    0    zp+ah    0    0    z+ah    0.05260011
GW    6    7    0    3    0+ah    0    1*rsf    rh+ah    0.05260011
GW    7    7    0    -3    0+ah    0    -1*rsf    rh+ah    0.05260011
GW    8    7    -3    0    0+ah    -1*rsf    0    rh+ah    0.05260011
GW    9    9    3    0    0+ah    1*rsf    0    rh+ah    0.05260011
GW    10    1    0    0    0+ah    3    0    0+ah    0.05260011
GW    11    1    0    0    0+ah    -3    0    0+ah    0.05260011
GW    12    1    0    0    0+ah    0    3    0+ah    0.05260011
GW    13    1    0    0    0+ah    0    -3    0+ah    0.05260011
GW    100    1    1*rsf    0*rsf    0+rh+ah    .92239*rsf    .382677*rsf    0+rh+ah    0.05260011
GW    101    1    .92239*rsf    .382677*rsf    0+rh+ah    .707126*rsf    .707126*rsf    0+rh+ah    0.05260011
GW    102    1    .707126*rsf    .707126*rsf    0+rh+ah    .382677*rsf    .92239*rsf    0+rh+ah    0.05260011
GW    103    1    .382677*rsf    .92239*rsf    0+rh+ah    0*rsf    1*rsf    0+rh+ah    0.05260011
GW    104    1    0*rsf    1*rsf    0+rh+ah    -.382677*rsf    .92239*rsf    0+rh+ah    0.05260011
GW    105    1    -.382677*rsf    .92239*rsf    0+rh+ah    -.707126*rsf    .707126*rsf    0+rh+ah    0.05260011
GW    106    1    -.707126*rsf    .707126*rsf    0+rh+ah    -.92239*rsf    .382677*rsf    0+rh+ah    0.05260011
GW    107    1    -.92239*rsf    .382677*rsf    0+rh+ah    -1*rsf    0*rsf    0+rh+ah    0.05260011
GW    108    1    -1*rsf    0*rsf    0+rh+ah    -.92239*rsf    -.382677*rsf    0+rh+ah    0.05260011
GW    109    1    -.92239*rsf    -.382677*rsf    0+rh+ah    -.707126*rsf    -.707126*rsf    0+rh+ah    0.05260011
GW    110    1    -.707126*rsf    -.707126*rsf    0+rh+ah    -.382677*rsf    -.92239*rsf    0+rh+ah    0.05260011
GW    111    1    -.382677*rsf    -.92239*rsf    0+rh+ah    0*rsf    -1*rsf    0+rh+ah    0.05260011
GW    112    1    0*rsf    -1*rsf    0+rh+ah    .382677*rsf    -.92239*rsf    0+rh+ah    0.05260011
GW    113    1    .382677*rsf    -.92239*rsf    0+rh+ah    .707126*rsf    -.707126*rsf    0+rh+ah    0.05260011
GW    114    1    .707126*rsf    -.707126*rsf    0+rh+ah    .92239*rsf    -.382677*rsf    0+rh+ah    0.05260011
GW    115    1    .92239*rsf    -.382677*rsf    0+rh+ah    1*rsf    0*rsf    0+rh+ah    0.05260011
GS    0    0    0.0254
GE    1
GN    2    0    0    0    13    0.005
EK
EX    0    1    1    0    1    0    0
FR    0    0    0    0    27.18    0
EN


The DB
 
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