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"Top Hat" GH with NARODs for VHF-HI: Major GH Improvement

388761 Views 939 Replies 87 Participants Last post by  Scorpio_333, 
N
this is a modification of the JED's GH10 (rev2),
with bent NARODs and 3 narod reflectors.

Chart:


Numerical gain data (VHF-hi):
Code: 
Ch		7	8	9	10	11	12	13
swr		1.63	1.69	2.24	2.2	1.84	1.34	1.17
Net Gain	9.06	9.33	8.9	8.78	8.83	8.81	8.29
Numerical gain data (UHF):
Code: 
Ch		14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54
swr		1.22	1.27	1.36	1.45	1.52	1.55	1.47	1.38	1.35	1.35	1.36	1.37	1.38	1.38	1.39	1.39	1.4	1.4	1.41	1.42	1.44	1.48	1.53	1.57	1.6	1.62	1.64	1.67	1.69	1.72	1.75	1.78	1.8	1.83	1.85	1.87	1.91	1.95	2.01	2.09	2.18
Net Gain	13.59	13.9	14.14	14.29	14.35	14.33	14.43	14.59	14.65	14.66	14.65	14.61	14.58	14.55	14.51	14.5	14.49	14.47	14.43	14.38	14.27	14.13	14.05	14.1	14.27	14.46	14.61	14.76	14.88	14.99	15.11	15.22	15.32	15.41	15.47	15.47	15.39	15.18	14.86	14.39	13.74
nec code
Code: 
CE
SY radius=0.003175
SY hat_rad=0.003175	'0.0010265
SY l1=0.381
SY g1=0.019
SY z1=0.037
SY l2=0.280
SY g2=0.009
SY z2=0.137
SY l3=0.556
SY g3=0.0055
SY z3=0.262
SY l4=0.511
SY g4=4e-3
SY z4=0.414
SY l5=0.270
SY g5=4e-3
SY z5=0.592
SY x=-0.081
SY a1=0.196
SY a2=0.192
SY a3=0.190
SY b=0.120
SY feed=0.0548348
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_l=0.449369
SY n_top_l=0.223443
SY n_b_l=(n_l - n_top_l)/2
SY n_z_sp=0.012
SY n_h=0.04795
SY n_b_z=a1pa2pa3*.7071+n_z_sp+hat_rad-radius
SY n_top_z=n_b_z+n_h
SY n_back=-0.25325
SY n_refl_size=0.404294
SY n_refl_z=0.367714
SY n_refl_size1=0.447082
GW	1	23	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	23	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	23	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	15	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	5	45	x	g1	z1	x	l1+g1	z1	radius
GW	6	33	x	g2	z2	x	l2+g2	z2	radius
GW	7	65	x	g3	z3	x	l3+g3	z3	radius
GW	8	61	x	g4	z4	x	l4+g4	z4	radius
GW	8	33	x	g5	z5	x	l5+g5	z5	radius
GW	13	7	0	-n_top_l	n_top_z	0	-n_top_l	n_b_z	hat_rad
GW	14	13	0	-n_top_l	n_b_z	0	-n_top_l-n_b_l	n_b_z	hat_rad
GX	20	010
GW	10	53	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	hat_rad
GW	15	95	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	13	0	-feed	0	0	feed	0	radius*.8675
GW	16	105	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	7	0	1			
FR	0	0	0	0	800	0
RP	0	60	73	1001	0	0	3	5		
EN
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N
Convergence test

I did it with the model from post 54:

Code: 
Run     SWR     Gain    F/B     F/R     R-a     X-a     Eff.    Segs

1-0     1.4754  13.13   6.12    6.12    429.21  55.034  99.87   328     
1-1     1.458   13.1    6.11    6.11    432.63  32.872  99.87   426     
1-2     1.4458  13.05   6.09    6.09    433.7   2.9925  99.87   570     
1-3     1.4452  13.02   6.09    6.09    432.2   -17.46  99.87   754     
1-4     1.4526  12.99   6.09    6.09    428.61  -39.94  99.87   1004    
1-5     1.4662  12.98   6.1     6.1     424.21  -58.6   99.87   1310    
1-6     1.8526  13.16   6.1     6.1     510.02  -126.2  99.87   1752    
1-7     1.7968  12.89   6.13    6.13    454.7   -155.8  99.88   2318    
1-8     1.8304  12.62   6.2     6.2     406.3   -186.1  99.88   3066    
1-9     2.0167  12.15   6.35    6.35    333.99  -224.1  99.89   4074    
1-10    2.6439  10.07   7.72    7.72    115.99  -41.32  99.9    5418    
1-11    3.8206  5.9     10.98   10.98   121.58  -210.1  99.92   7198    
1-12    1981.3  8.27    10.45   10.45   0.1527  -27.33  98.71   9570
The last line should be ignored since that is where the test was interrupted by an error.
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A
Nikiml,

Re your conv-test results in post #61, I sent you an email with some tips and suggested investigations you could do to obtain a better understanding of these results. I don't have the time to dig into now.

I would simply point out that runs 1-0 to 1-3 are for segmentation at 10 segs per 1/2 wave to ~23 segs per 1/2 wave and the gain varies from 13.13 to 13.02. The next run 1-4 has a total seg count of 1004, which is ~31 segs per 1/2 wave.

I suspect that for run1-4 (and 1-5 to 1-12), the normal 4nec2 segment check would report errors. If this turns out to be the case, conv-test results for these runs are not valid.

If you have the time, it would be very interesting to investigate a manual nec file based on run 1-4 at ~ 30 segs per 1/2 wave. Does it pass the normal 4nec2 segment check with no errors at 585mHz? What about runs 1-5 to 1-12 ?
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N
You were exactly right.
1-0...1-4 are warning free, but the rest dont pass the segment checks
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M
I was going to run that nec model (post 54) in EZNEC and run the auto seg on it but I couldn't import it in because EZNEC likes to import actual x,y,z cooridinates and those are not. EZNEC gives 2 options for segmentation conservative or minimum recommended for the frequency you select. I was curious what it would do with that model but it didn't happen. I know with other models I've adjusted the segments to 1 and then let EZNEC auto segment and it did a great job.

Many times after auto segmentating certain models I had to adjust the source wire diameter very close to the size of the wires it was attached to to get the AGT back in line. I would think that is a good thing because I'm still on the fence about adjusting the source wire much to get a good AGT.

I've also found that some things that EZNEC doesn't protest about 4NEC2 does like certain dia/seg ratios and dia/length ratios. I'm not very good with 4NEC2 I really only use it to get some of the nice graphs it generates.
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mclapp said:
..I was going to run that nec model (post 54) in EZNEC and run the auto seg on it but I couldn't import it in because EZNEC likes to import actual x,y,z cooridinates and those are not.
Click to expand...
mclapp,

You can easily convert the 4nec2 nec file into compatible (x,y.z) co-ordinates for EZNEC, by resaving the nec file in 4nec2's geometry editor, under the settings tab in 4nec2's main window. That save will strip out all the SY cards.

re your other comment:
Many times after auto segmentating certain models I had to adjust the source wire diameter very close to the size of the wires it was attached to to get the AGT back in line. I would think that is a good thing because I'm still on the fence about adjusting the source wire much to get a good AGT.
Click to expand...
I have been absent from the forum for the past 15 months or so, but when I started my trolling on the Antenna R&D forums to get caught up on past events, the comments on AGT by j3d really caught my attention. The public domain nec2 core has well documented limitations, one of which is connection of wire elements having different diameters. If the AGT test is adjusted for 1.0 by changing the wire diameter of the Vsource, then we are "adding" to this nec2 core limitation in our model, rather than always trying to minimize the nec2 core limitations to get the "best" model for representing the antenna design. This is the point that j3d was making.
Reference post by j3d 5 May 2009 --> http://www.digitalhome.ca/forum/showpost.php?p=922854&postcount=45

From my reading in this thread, I don't see that much discussion took place on this subject. For those that have a desire to better understand the limitations of the nec2 core and how best to deal with nec2 limitations in their models, I see the question to be answered as this:

If the adjustment to the wire diameter of the Vsource is only a very small percentage, does this "procedure" have merit or should it be abandoned?
In post 49 of this thread, 300Ohm mentioned the following:
300Ohn said:
...And maybe Arie Voors too. Hes posted on this website in your absence, and likes us too. So has Dr. Natan Cohen, the Fractal Guy, the originator of the fractal antenna.
Click to expand...
I would suggest that this subject should be discussed in more detail.
I'm sure that all, would like to get the views from Arie and Dr Cohen.

Cheers
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If the adjustment to the wire diameter of the Vsource is only a very small percentage, does this "procedure" have merit or should it be abandoned?
Click to expand...
Ive always looked at it, because the Vsource wire isnt a real wire in the build anyway, that its sole purpose is for AGT adjustment. (or maybe possibly as part of a balun wire)

I've also found that some things that EZNEC doesn't protest about 4NEC2 does like certain dia/seg ratios and dia/length ratios.
Click to expand...
Heh, yeah. I think some of those warnings may be built in cost overrun warnings. Like, hey, youre using wire too thick and pricey for the purpose, heh.

Although, really really fat dipoles start to behave like bowties.
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A
300Ohm said:
Ive always looked at it, because the Vsource wire isnt a real wire in the build anyway, that its sole purpose is for AGT adjustment. (or maybe possibly as part of a balun wire)
... Heh, yeah. I think some of those warnings may be built in cost overrun warnings.
Click to expand...
300Ohm,

Re your comment "the Vsource wire isnt a real wire in the build anyway": Are you stating an opinion that you believe the "AGT wire adjustment procedure" is valid or it is not valid, since the Vsource wire element is not a part of the antenna design?

I'm also not exactly clear on what you mean by "those warnings may be built in cost overrun". By cost overrun, are you implying that 4nec2 warnings are not really all that important and thus can be ignored? Only errors are really important?

I'm not being critical, I just feel that clear understandings are needed to have a good discussion.

Cheers
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Are you stating an opinion that you believe the "AGT wire adjustment procedure" is valid or it is not valid, since the Vsource wire element is not a part of the antenna design?
Click to expand...
That it is valid for adjusting the antenna to get the Average Gain Test value to 0 db, so that the model would be reliable. (other than adding or subtracting the AGT value, which on a sweep becomes unmanagable)

By cost overrun, are you implying that 4nec2 warnings are not really all that important and thus can be ignored? Only errors are really important?
Click to expand...
Yeah, the errors are the big no-no's.

Warnings on the otherhand,
The warning for the wire diameter size for reflectors, doesnt seem to make a difference in real life builds, from what Ive observed, other than fatter/wider the better.
And the angle too sharp warnings, for example on bowties, dont seem to amount to anything either.

I havent hit upon every warning yet, so there may be some that should cause serious concern. But for the most part it seems the warnings are something that should be acknowledged, ie yes its a fat reflector or yes thats a sharp angle, but then move on, heh.
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Since the reflector-less SBGH with NARODs is a pretty popular antenna to build, (not ANY bi-directional vhf-hi/uhf antennas are commercially available AFAIK) nikimls top hat NAROD is a good overall compromise over the vhf-hi band and it minimizes the channel 33 -38 gain dip. For channel ranges 7 - 9 or 11 - 13, and if channel 33 - 38 arent a concern, the specific vhf-hi channel range vhf-hi straight NAROD would be the ticket.

NEC file with gen1 reflector-less SBGH with nikimls optimized top hat NAROD.

Code: 
CM model segmentation is derived from autosegmentation 21 at 698Mhz
CM AGT = 1.0 (0db) at 585 mhz
CM Based on Nikiml top hat gen1 SBGH with 89mm feed point 
CM and using 6 gauge wire for driven elements and NARODs.
CE
GW	1	21	0	-1.7519685	0	0	-6.7629921	5.01101575	0.08101138
GW	2	21	0	-6.7629921	5.01101575	0	-1.7519685	10.0220315	0.08101138
GW	3	21	0	-1.7519685	10.0220315	0	-6.7629921	15.0330472	0.08101138
GW	4	17	0	-6.7629921	15.0330472	0	-12.353543	15.0330472	0.08101138
GW	11	7	0	-8.5472441	17.4304724	0	-8.5472441	15.4934646	0.08101138
GW	14	15	0	-8.5472441	15.4934646	0	-13.429134	15.4934646	0.08101138
GW	21	21	0	1.7519685	0	0	6.76299213	5.01101575	0.08101138
GW	22	21	0	6.76299213	5.01101575	0	1.7519685	10.0220315	0.08101138
GW	23	21	0	1.7519685	10.0220315	0	6.76299213	15.0330472	0.08101138
GW	24	17	0	6.76299213	15.0330472	0	12.3535433	15.0330472	0.08101138
GW	31	7	0	8.54724409	17.4304724	0	8.54724409	15.4934646	0.08101138
GW	34	15	0	8.54724409	15.4934646	0	13.4291339	15.4934646	0.08101138
GW	10	51	0	8.54724409	17.4304724	0	-8.5472441	17.4304724	0.08101138
GW	41	21	0	-1.7519685	0	0	-6.7629921	-5.0110157	0.08101138
GW	42	21	0	-6.7629921	-5.0110157	0	-1.7519685	-10.022031	0.08101138
GW	43	21	0	-1.7519685	-10.022031	0	-6.7629921	-15.033047	0.08101138
GW	44	17	0	-6.7629921	-15.033047	0	-12.353543	-15.033047	0.08101138
GW	51	7	0	-8.5472441	-17.430472	0	-8.5472441	-15.493465	0.08101138
GW	54	15	0	-8.5472441	-15.493465	0	-13.429134	-15.493465	0.08101138
GW	61	21	0	1.7519685	0	0	6.76299213	-5.0110157	0.08101138
GW	62	21	0	6.76299213	-5.0110157	0	1.7519685	-10.022031	0.08101138
GW	63	21	0	1.7519685	-10.022031	0	6.76299213	-15.033047	0.08101138
GW	64	17	0	6.76299213	-15.033047	0	12.3535433	-15.033047	0.08101138
GW	71	7	0	8.54724409	-17.430472	0	8.54724409	-15.493465	0.08101138
GW	74	15	0	8.54724409	-15.493465	0	13.4291339	-15.493465	0.08101138
GW	50	51	0	8.54724409	-17.430472	0	-8.5472441	-17.430472	0.08101138
GW	100	11	0	-1.7519685	0	0	1.7519685	0	0.06424494
GS	0	0	0.0254		' All in in.
GE	0
EK
LD	5	0	0	0	2.49e7	0
EX	0	100	6	0	1	0
GN	-1
FR	0	1	0	0	698	0
RP 0 60 73 1001 0 0 3 5
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M
Adjusting the source wire can also be accomplished by changing it's length and get the same result.

In many of my models I use wires running away from the feed point like balun wires would be and then attach the source to that. By doing that it allows me to change the source wire length and it has the same effect as changing the diameter. I don't think it's any better than changing the source wire diameter except maybe it doesn't fall into some of NEC limitations but I don't think that a very small increase or decrease in wire diameter does either. I've tried it both ways and got the same results.

If your segmentation is way off and you have to adjust your source wire a lot to get a good AGT then probably your convergence is bad due to the poor segmentation. In that case I would say adjusting the source wire diameter is just fooling yourself.
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A
More "Food for Thought" re ConvergenceTest & AGT Adjust

My thanks to 300Ohm and mclapp for their comments:
Reference links:
300Ohm (post 68) --> http://www.digitalhome.ca/forum/showpost.php?p=1111831&postcount=68
mclapp (post 70) --> http://www.digitalhome.ca/forum/showpost.php?p=1112072&postcount=70

Like 300Ohm, I have used the AGT adjust "procedure" in all my past posted 4nec2 nec files. I never really questioned the effect of different wire diameter, on this AGT adjustment, because the results never indicated any significant wrong results.

After recently reading j3d's post on the subject, and with a re-read Cebik's modeling guide, part 4 ( the last 2 pages under the heading "Testing Models"), I thought it would provide a better understanding of 4nec2 limitations, if jed's question could be answered with some detail and if possible some reference links.
Reference link to j3d's post --> http://www.digitalhome.ca/forum/showpost.php?p=922854&postcount=45

For me, the questions that need answers is simply this: ... in the case of the AGT adjust procedure, do two wrongs actually may a right" and along with that, do other modelers, besides DigitalHome.ca forum members, use this AGT adjust procedure?

The recent posting (post 61) by Nikiml re Convergence Tests on his model, provides some "food -for-thought" and I invite comments. If the majority of readers on this subject feel, that this is somewhat of a waste of time, I will stop posting on this subject, as I have plenty of other activities to keep me busy. The only way I can "measure" the interest in this subject is from the posts that are made.

Food - for - Thought Comments
=========================
Nikiml's post 61, Convergence-Tests showed, that up until segment-check errors occurred, the raw gain varied from 13.13 dBi (total_segs=328) to 12.99 (total segs=1004). Reference link (post 61): --> http://www.digitalhome.ca/forum/showpost.php?p=1111469&postcount=61

By extrapolation of Nikiml's data, 21 segments per 1/2 wave raw gain would be 13.03 dBi. For this specific model, the Convergence Test reveals the "most accurate" raw gain convergence is 12.99dBi. So does the recommended model at 21 segments per 1/2 wave using the AGT adjust procedure, give a more accurate result, not only for this model, but for any model, regardless of the complexity? The beauty of the Non-adjusted AGT Test and the Convergence Test is: you can depend on the results, regardless of antenna model differences (GH vs Yagi or BowTie etc)and the antenna's complexity.

In an effort to continue this discussion, here are some more "food-for-thought" links.

1. Arie's 4nec2 Forum
The AGT is off - Why? A bug?
http://fornectoo.freeforums.org/the-agt-is-off-why-a-bug-t175.html

Auto Segment
http://fornectoo.freeforums.org/auto-segment-t189.html


2. Practical Antenna Modeling - WX7S
http://www.wx7s.com/wordpress/?m=200812

3. Antenna Modeling for Radio Amateurs
Here is an excellent overview about some of the history of antenna modeling with references to mathematical models. There is a brief discussion about limitations of the various modeling approaches and a summary of EZNEC and 4nec2 is included. This pdf doc was written by Steve Stearns, K6OIK.

http://www.fars.k6ya.org/docs/Antenna-Modeling-for-Radio-Amateurs.pdf

...Cheers
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N
Dimensions

I decided to cleanup the models I posted earlier, to remove the segmentation warnings, to fix the spacing between the NARODs and the driven elements to 12mm and remove few inaccuracies.
Bellow are the dimensions for the "cleaned-up" jeds GH mods with Top hat NARODs and 3 narod reflectors.

I propose to call them GH10n3,..., GH4n3 - n for NARODS and 3 for the narod reflectors.

For all models use the dimensions from the JED's website plus the additional dimensions from below.


The X dimension is the distance between the driven elements plane and the NAROD reflectors plane.
s is the distance (center to center) between the horizontal legs of the NARODS and the driven elements.
The b dimension from the JED's models is also the length of the horizontal legs of the narods.



Code: 
	    GH10n3	       GH8n3	      GH6n3	      GH4n3	
--------+-----------------+--------------+---------------+---------------+
Dim	| mm	inch	  | mm	inch	 | mm 	inch	 | mm 	inch	 |
--------------------------------------------------------------------------
s	| 12	1/2	  | 12	1/2	 | 12	1/2	 | 12	1/2	 |
a	| 427	16 13/16  | 428	16 7/8	 | 399	15 13/16 | 405	16    	 |
h	| 49	1 15/16	  | 48	1 7/8	 | 60	2 3/8	 | 57	2 1/4	 |
L1	| 907	35 11/16  | 960	37 13/16 | 995	39 3/16	 | 961	37 13/16 |
L2	| 804	31 11/16  | 813	32    	 | 813	32    	 | 810	31 15/16 |
Z	| 360	14 3/16	  | 433	17    	 | 448	17 5/8	 | 470	18 1/2	 |
X	| 240	9 7/16	  | 300	11 13/16 | 314	12 3/8	 | 316	12 7/16	 |
Gain values (scroll for all models):

Code: 
	GH10n3					
=======================			
Ch.	Freq 	R-Gain	R-in 	X-in	SWR	NetGain
--------------------------------------------------------		
	171	8.08	256.81	-499.31	5.06	5.49
	174	9.11	231.29	-171.44	1.99	8.61
7	177	9.46	266.23	12.45	1.14	9.44
	180	9.58	336.79	130.76	1.53	9.39
8	183	9.6	438.92	194.54	1.91	9.15
	186	9.57	557.45	189.96	2.15	8.95
9	189	9.52	649.62	108.94	2.24	8.83
	192	9.45	666.92	-12.84	2.22	8.77
10	195	9.36	609.35	-111.47	2.12	8.76
	198	9.27	520.17	-155.26	1.95	8.79
11	201	9.15	435.78	-152.02	1.74	8.82
	204	9.01	370.32	-119.47	1.51	8.83
12	207	8.83	325.97	-69.96	1.27	8.77
	210	8.59	302.42	-9.27	1.03	8.59
13	213	8.24	302.07	60.93	1.22	8.2
	216	7.74	334.63	139.65	1.57	7.52
	219	7.01	424.63	216.01	1.98	6.51
.......................................................			
	467	13.37	289.63	-32.3	1.12	13.36
14	473	13.75	295.63	-57.54	1.21	13.71
15	479	14.08	282.73	-67.07	1.27	14.02
16	485	14.34	266.78	-62.95	1.29	14.27
17	491	14.5	249.68	-49.03	1.29	14.43
18	497	14.58	234.07	-20	1.3	14.51
19	503	14.65	237.36	24.94	1.29	14.58
20	509	14.76	267.13	59.15	1.27	14.7
21	515	14.82	298.55	74.65	1.28	14.75
22	521	14.82	327.56	85.09	1.33	14.73
23	527	14.8	359.82	90.91	1.39	14.68
24	533	14.77	394.49	87.42	1.45	14.62
25	539	14.73	426.14	73.11	1.5	14.55
26	545	14.7	450.03	51.13	1.53	14.5
27	551	14.68	464.88	26.17	1.56	14.47
28	557	14.67	471.88	1.89	1.57	14.45
29	563	14.67	473.1	-19.67	1.58	14.44
30	569	14.67	470.65	-37.62	1.59	14.44
31	575	14.66	466.41	-51.81	1.59	14.43
32	581	14.64	462.05	-62.58	1.59	14.41
33	587	14.59	459.22	-70.79	1.59	14.36
34	593	14.49	459.48	-78.39	1.61	14.25
35	599	14.37	462.97	-89.1	1.64	14.11
36	605	14.31	465.57	-106.52	1.68	14.02
37	611	14.37	461.02	-128.46	1.73	14.05
38	617	14.52	448.43	-148.78	1.76	14.18
39	623	14.69	431.09	-164.65	1.78	14.33
40	629	14.85	411.32	-176.26	1.8	14.48
41	635	14.99	389.92	-184.18	1.81	14.62
42	641	15.12	367.14	-188.48	1.81	14.74
43	647	15.24	343.31	-188.89	1.81	14.86
44	653	15.35	318.95	-185.04	1.81	14.97
45	659	15.46	294.81	-176.7	1.8	15.09
46	665	15.56	271.74	-163.79	1.78	15.21
47	671	15.65	250.62	-146.55	1.74	15.32
48	677	15.71	232.22	-125.47	1.71	15.4
49	683	15.72	216.93	-101.27	1.66	15.44
50	689	15.64	204.7	-74.53	1.62	15.39
51	695	15.44	195.21	-45.27	1.6	15.2
52	701	15.11	188.52	-12.94	1.6	14.87
	707	14.61	185.4	23.11	1.63	14.35



	GH8n3					
=======================			
		
Ch.	Freq 	R-Gain	R-in 	X-in	SWR	NetGain
--------------------------------------------------------		
	171	9.23	430.41	-412.05	3.13	7.89
	174	9.71	388.99	-155.22	1.68	9.42
7	177	9.81	413.22	-18.91	1.38	9.7
	180	9.77	458.11	48.68	1.56	9.56
8	183	9.67	502.68	70.44	1.73	9.35
	186	9.56	534.54	63.59	1.82	9.18
9	189	9.44	549.3	43.61	1.85	9.04
	192	9.33	549.25	22.2	1.84	8.94
10	195	9.23	539.92	5.78	1.8	8.86
	198	9.13	526.84	-3.56	1.76	8.79
11	201	9.05	514.16	-6.27	1.71	8.74
	204	8.97	504.58	-3.8	1.68	8.68
12	207	8.91	499.79	2.14	1.67	8.63
	210	8.85	500.93	9.81	1.67	8.57
13	213	8.79	508.92	17.33	1.7	8.49
	216	8.74	524.63	22.46	1.75	8.4
	219	8.69	548.74	22.09	1.83	8.3
.......................................................			
	467	13.74	185.86	-80.76	1.79	13.38
14	473	13.87	202.7	-47.29	1.55	13.67
15	479	13.97	223.22	-19.89	1.36	13.87
16	485	14.05	246.06	1	1.22	14.01
17	491	14.12	269.6	15.44	1.13	14.1
18	497	14.19	292.22	24.11	1.09	14.18
19	503	14.25	312.7	28.26	1.11	14.24
20	509	14.3	330.57	29.46	1.14	14.28
21	515	14.36	346.14	29.1	1.18	14.33
22	521	14.39	360.26	27.91	1.22	14.35
23	527	14.39	373.69	25.78	1.26	14.33
24	533	14.35	386.45	22.25	1.3	14.28
25	539	14.29	398.06	17.33	1.33	14.2
26	545	14.24	408.34	11.54	1.36	14.14
27	551	14.19	417.56	5.27	1.39	14.07
28	557	14.17	426.01	-1.42	1.42	14.04
29	563	14.15	433.86	-8.62	1.45	14
30	569	14.15	441.13	-16.42	1.47	13.99
31	575	14.15	447.81	-24.86	1.5	13.97
32	581	14.16	453.9	-33.93	1.53	13.97
33	587	14.17	459.47	-43.7	1.56	13.96
34	593	14.18	464.62	-54.32	1.58	13.95
35	599	14.18	469.4	-66.18	1.62	13.93
36	605	14.19	473.57	-79.92	1.65	13.92
37	611	14.2	476.3	-96.25	1.69	13.9
38	617	14.23	476.03	-115.37	1.73	13.91
39	623	14.29	470.97	-136.41	1.78	13.94
40	629	14.37	460.04	-157.4	1.81	13.99
41	635	14.47	443.35	-176.16	1.85	14.07
42	641	14.58	421.89	-190.98	1.87	14.16
43	647	14.7	396.98	-200.86	1.89	14.27
44	653	14.82	369.92	-205.26	1.9	14.38
45	659	14.93	341.86	-204.01	1.9	14.49
46	665	15.03	313.84	-197.08	1.88	14.6
47	671	15.11	286.81	-184.58	1.86	14.7
48	677	15.18	261.6	-166.68	1.82	14.79
49	683	15.21	239.03	-143.61	1.78	14.86
50	689	15.19	219.81	-115.68	1.72	14.88
51	695	15.1	204.61	-83.13	1.66	14.83
52	701	14.92	194.16	-46.16	1.61	14.68
	707	14.6	189.32	-4.93	1.59	14.37



	GH6n3					
=======================			
		
Ch.	Freq 	R-Gain	R-in 	X-in	SWR	NetGain
--------------------------------------------------------		
	171	9.38	582.83	-616.95	4.41	7.18
	174	9.74	461.54	-292.53	2.39	8.94
7	177	9.79	445.98	-133.7	1.71	9.48
	180	9.72	456.82	-54.85	1.56	9.51
8	183	9.6	468.65	-19.24	1.57	9.38
	186	9.47	472.55	-5.13	1.58	9.25
9	189	9.34	467.95	1.26	1.56	9.13
	192	9.22	457.92	7.52	1.53	9.03
10	195	9.11	446.1	16.9	1.49	8.94
	198	9.02	435.39	30.2	1.46	8.86
11	201	8.93	427.76	47.18	1.46	8.78
	204	8.85	424.54	67.31	1.48	8.68
12	207	8.78	426.77	90.04	1.54	8.58
	210	8.72	435.61	114.9	1.63	8.47
13	213	8.66	452.55	141.38	1.75	8.33
	216	8.6	479.81	168.67	1.89	8.16
	219	8.55	520.71	195.14	2.07	7.99
.......................................................			
	467	13.52	200.78	-56.34	1.59	13.29
14	473	13.61	229.49	-24.95	1.33	13.52
15	479	13.67	260.24	-3.96	1.15	13.65
16	485	13.71	290.04	7.25	1.04	13.71
17	491	13.74	316.27	10.59	1.07	13.74
18	497	13.76	337.53	8.85	1.13	13.74
19	503	13.78	353.89	4.73	1.18	13.75
20	509	13.8	366.43	0.14	1.22	13.76
21	515	13.8	376.55	-4.08	1.26	13.74
22	521	13.78	385.39	-7.91	1.29	13.71
23	527	13.74	393.45	-11.73	1.31	13.66
24	533	13.68	400.76	-15.69	1.34	13.59
25	539	13.61	407.43	-19.61	1.36	13.51
26	545	13.57	413.87	-23.38	1.39	13.45
27	551	13.56	420.47	-27.28	1.41	13.43
28	557	13.56	427.32	-31.71	1.44	13.42
29	563	13.58	434.31	-37.02	1.47	13.42
30	569	13.6	441.21	-43.44	1.5	13.42
31	575	13.62	447.73	-51.08	1.53	13.43
32	581	13.65	453.6	-59.98	1.56	13.44
33	587	13.68	458.55	-70.1	1.59	13.45
34	593	13.71	462.32	-81.38	1.62	13.46
35	599	13.74	464.63	-93.75	1.65	13.47
36	605	13.78	465.15	-107.07	1.68	13.49
37	611	13.84	463.5	-121.09	1.71	13.53
38	617	13.91	459.35	-135.38	1.74	13.58
39	623	13.98	452.49	-149.37	1.77	13.63
40	629	14.07	442.92	-162.43	1.8	13.7
41	635	14.16	430.81	-174	1.82	13.78
42	641	14.25	416.4	-183.6	1.83	13.86
43	647	14.35	399.98	-190.8	1.84	13.95
44	653	14.43	381.89	-195.2	1.85	14.02
45	659	14.52	362.53	-196.45	1.85	14.12
46	665	14.6	342.31	-194.2	1.84	14.2
47	671	14.67	321.76	-188.12	1.82	14.28
48	677	14.73	301.45	-177.91	1.79	14.37
49	683	14.76	282.07	-163.35	1.75	14.43
50	689	14.76	264.43	-144.25	1.68	14.47
51	695	14.72	249.42	-120.57	1.61	14.48
52	701	14.6	238.08	-92.39	1.51	14.42
	707	14.39	231.5	-59.99	1.41	14.26



	GH4n3					
=======================			
		
Ch.	Freq 	R-Gain	R-in 	X-in	SWR	NetGain
--------------------------------------------------------		
	171	9.25	480.26	-600.55	4.51	6.99
	174	9.73	400.55	-300.01	2.42	8.91
7	177	9.83	398.74	-144.31	1.65	9.56
	180	9.77	417.54	-61.69	1.45	9.62
8	183	9.66	436.98	-20.34	1.46	9.5
	186	9.53	449.47	-1.17	1.5	9.35
9	189	9.41	454.02	8.26	1.51	9.22
	192	9.29	452.94	15.31	1.51	9.11
10	195	9.18	449.35	23.56	1.51	9
	198	9.08	445.98	34.25	1.5	8.9
11	201	8.99	444.89	47.45	1.51	8.8
	204	8.91	447.57	62.71	1.54	8.71
12	207	8.84	455.24	79.38	1.6	8.6
	210	8.77	469.1	96.66	1.67	8.49
13	213	8.71	490.56	113.45	1.77	8.36
	216	8.66	521.36	128.06	1.89	8.23
	219	8.61	563.66	137.63	2.03	8.08
.......................................................			
	467	13.21	203.37	-73	1.63	12.96
14	473	13.3	240.41	-44.8	1.32	13.22
15	479	13.33	277.38	-34.12	1.15	13.31
16	485	13.32	306.54	-37.95	1.14	13.3
17	491	13.28	323.56	-48.99	1.19	13.25
18	497	13.24	329.51	-59.83	1.24	13.19
19	503	13.21	328.53	-66.33	1.26	13.15
20	509	13.18	324.75	-67.65	1.26	13.12
21	515	13.17	320.96	-64.66	1.24	13.12
22	521	13.16	318.62	-58.71	1.22	13.12
23	527	13.17	318.32	-51.05	1.19	13.14
24	533	13.19	320.23	-42.63	1.16	13.16
25	539	13.22	324.24	-34.16	1.14	13.2
26	545	13.25	330.18	-26.17	1.14	13.23
27	551	13.27	337.86	-19.04	1.14	13.25
28	557	13.29	347.04	-13.08	1.16	13.27
29	563	13.3	357.51	-8.54	1.19	13.27
30	569	13.3	369.04	-5.63	1.23	13.25
31	575	13.31	381.44	-4.52	1.27	13.25
32	581	13.3	394.48	-5.43	1.32	13.22
33	587	13.3	407.94	-8.58	1.36	13.2
34	593	13.3	421.5	-14.24	1.41	13.17
35	599	13.29	434.72	-22.69	1.46	13.14
36	605	13.29	447.01	-34.2	1.51	13.11
37	611	13.3	457.55	-48.9	1.56	13.09
38	617	13.32	465.3	-66.66	1.6	13.08
39	623	13.36	469.19	-86.93	1.65	13.09
40	629	13.4	468.29	-108.72	1.7	13.1
41	635	13.45	462.03	-130.71	1.74	13.12
42	641	13.5	450.28	-151.43	1.77	13.15
43	647	13.56	433.33	-169.43	1.8	13.19
44	653	13.61	411.91	-183.37	1.83	13.22
45	659	13.67	387.01	-192.19	1.84	13.27
46	665	13.72	359.88	-195.12	1.84	13.32
47	671	13.76	331.82	-191.75	1.83	13.37
48	677	13.79	304.15	-181.92	1.81	13.41
49	683	13.8	278.09	-165.74	1.77	13.45
50	689	13.76	254.8	-143.45	1.71	13.45
51	695	13.65	235.32	-115.4	1.64	13.39
52	701	13.46	220.71	-81.98	1.55	13.25
	707	13.12	212.03	-43.65	1.47	12.96

Model (again scroll for each model):
Code: 
CM GH10n3
CE
SY radius=0.003175
SY l1=0.381
SY g1=0.019
SY z1=0.037
SY l2=0.280
SY g2=0.009
SY z2=0.137
SY l3=0.556
SY g3=0.0055
SY z3=0.262
SY l4=0.511
SY g4=4e-3
SY z4=0.414
SY l5=0.270
SY g5=4e-3
SY z5=0.592
SY x=-0.081
SY a1=0.196
SY a2=0.192
SY a3=0.190
SY b=0.120
SY feed=0.0685
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.213588
SY n_b_l=b
SY n_h=0.049287
SY n_b_z=a1pa2pa3*.7071+0.012
SY n_top_z=n_b_z+n_h
SY n_back=-0.24027
SY n_refl_size=0.402098
SY n_refl_z=0.359698
SY n_refl_size1=0.453799
GW	1	23	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	23	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	23	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	15	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	5	45	x	g1	z1	x	l1+g1	z1	radius
GW	6	33	x	g2	z2	x	l2+g2	z2	radius
GW	7	65	x	g3	z3	x	l3+g3	z3	radius
GW	8	61	x	g4	z4	x	l4+g4	z4	radius
GW	8	33	x	g5	z5	x	l5+g5	z5	radius
GW	13	7	0	-n_top_l	n_top_z	0	-n_top_l	n_b_z		radius
GW	14	15	0	-n_top_l	n_b_z	0	-n_top_l-n_b_l	n_b_z		radius
GX	20	010
GW	10	51	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	95	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	17	0	-feed	0	0	feed	0	radius*.8675
GW	16	107	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	9	0	1			
FR	0	0	0	0	800	0
RP	0	60	73	1001	0	0	3	5		
EN

******************

CM GH8n3
CM 
CE
SY radius=0.003175
SY l1=0.314
SY g1=0.018
SY z1=0.083
SY l2=0.340
SY g2=0.0305
SY z2=0.258
SY l3=0.417
SY g3=0.0425
SY z3=0.439
SY l4=0.302
SY g4=.054
SY z4=0.620
SY x=-0.081
SY a1=0.193
SY a2=0.193
SY a3=0.183
SY b=0.121
SY feed=0.0725
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.214173
SY n_b_l=b
SY n_h=0.048478
SY n_b_z=a1pa2pa3*.7071+0.012
SY n_top_z=n_b_z+n_h
SY n_b_ystart=-n_top_l	'-feed-0.70711*a1ma2pa3-n_b_ysp
SY n_b_yend=n_b_ystart-n_b_l
SY n_back=-0.29961
SY n_refl_size=0.406309
SY n_refl_z=0.43301
SY n_refl_size1=0.479869
GW	1	23	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	23	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	21	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	15	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	5	37	x	g1	z1	x	l1+g1	z1	radius
GW	6	41	x	g2	z2	x	l2+g2	z2	radius
GW	7	49	x	g3	z3	x	l3+g3	z3	radius
GW	8	35	x	g4	z4	x	l4+g4	z4	radius
GW	11	7	0	-n_top_l	n_top_z	0	n_b_ystart	n_b_z	radius
GW	14	15	0	n_b_ystart	n_b_z	0	n_b_yend	n_b_z	radius
GX	20	010
GW	10	51	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	95	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	17	0	-feed	0	0	feed	0	radius*.8675
GW	16	113	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	9	0	1			
FR	0	0	0	0	800	0
RP	0	60	73	1001	0	0	3	5		
EN


******************

CM GH6n3
CE
SY radius=0.003175
SY l1=0.322
SY g1=0.022
SY z1=0.085
SY l2=0.328
SY g2=0.036
SY z2=0.299
SY l3=0.312
SY g3=0.0495
SY z3=0.590
SY x=-0.075
SY a1=0.184
SY a2=0.205
SY a3=0.171
SY b=0.124
SY feed=0.0755
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.19945
SY n_b_l=b
SY n_h=0.059786
SY n_b_z=a1pa2pa3*.7071+.012
SY n_top_z=n_b_z+n_h
SY n_b_ystart=-n_top_l	'-feed-0.70711*a1ma2pa3-n_b_ysp
SY n_b_yend=n_b_ystart-n_b_l
SY n_back=-0.31458
SY n_refl_size=0.406713
SY n_refl_z=0.447715
SY n_refl_size1=0.497582
GW	1	23	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	25	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	21	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	15	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	5	39	x	g1	z1	x	l1+g1	z1	radius
GW	6	39	x	g2	z2	x	l2+g2	z2	radius
GW	7	37	x	g3	z3	x	l3+g3	z3	radius
GW	11	7	0	-n_top_l	n_top_z	0	n_b_ystart	n_b_z	radius
GW	14	15	0	n_b_ystart	n_b_z	0	n_b_yend	n_b_z	radius
GX	20	010
GW	10	47	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	97	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	17	0	-feed	0	0	feed	0	radius*.8675
GW	16	117	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	9	0	1			
FR	0	0	0	0	800	0
RP	0	60	73	1001	0	0	3	5		
EN

******************

CM GH4n3
CE
SY radius=0.003175
SY l1=0.300
SY g1=0.018
SY z1=0.128
SY l2=0.312
SY g2=0.045
SY z2=0.444
SY x=-0.084
SY a1=0.196
SY a2=0.202
SY a3=0.171
SY b=0.122
SY feed=0.075
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.202458
SY n_b_l=b
SY n_h=0.056971
SY n_b_z=a1pa2pa3*.7071+.012
SY n_top_z=n_b_z+n_h
SY n_b_ystart=-n_top_l	'-feed-0.70711*a1ma2pa3-n_b_ysp
SY n_b_yend=n_b_ystart-n_b_l
SY n_back=-0.31613
SY n_refl_size=0.405376
SY n_refl_z=0.470002
SY n_refl_size1=0.480585
GW	1	23	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	25	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	21	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	15	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	5	35	x	g1	z1	x	l1+g1	z1	radius
GW	6	37	x	g2	z2	x	l2+g2	z2	radius
GW	11	7	0	-n_top_l	n_top_z	0	n_b_ystart	n_b_z	radius
GW	14	15	0	n_b_ystart	n_b_z	0	n_b_yend	n_b_z	radius
GX	20	010
GW	10	49	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	95	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	17	0	-feed	0	0	feed	0	radius*.8675
GW	16	113	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	9	0	1			
FR	0	0	0	0	800	0
RP	0	60	73	1001	0	0	3	5		
EN
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B
nikiml,

nice work, looks promising!
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3
nikiml, you missed the other NAROD dimension in the above drawings, previously you called C.
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N
No, this dimension is fixed to be equal to the jeds b dimension.
see the equal segment symbols on the "drawing".
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3
Oh OK, I now see what youre doing, the NAROD stubs are equal in length to the GH stubs, cool.
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N
By fixing this dimension and the s spacing I gave up some predicted gain, but now there are no segmentation warnings, and the 12 mm spacing was used by you in real life so I left it at that as a "safe" spacing.
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A
2
Nikiml.

In reference to your post 72 --> http://www.digitalhome.ca/forum/showpost.php?p=1112527&postcount=72.

That is an excellent summary of your GH10n3 - GH4.3 variants.

Most on this forum prefer the tablular data, but I believe a picture is worth a thousand words, so I put together a graphical comparison plot for the UHF and VHF-Hi Net Gains.

To get an appreciation for how good your models are, I compared your net gain data with two commercial antenna models done by Ken Nist (hdtvprimer website)
UHF - Channel master CM-4221 4bay Bowtie, (no longer in production, but all antenna buffs know this antenna as a top performer.)
VHF-Hi - Wade wideband yagi YA-1713 which is for VHF-Hi only and recognized by antenna buffs as an excellent antenna.

Net Gain - UHF


Net gain VHF-Hi


These plots clearly show the GH-xNy is in a "best-of class" category for a DIY Combo (VHF_Hi & UHF) antenna. Well done !!

Here is the link for Ken Nist's models for some of the newer commercial antennas. Take a look at the net gain for VHF-Hi commercial models; HD-7698P and CM-2020 near the bottom of the page.
http://www.hdtvprimer.com/ANTENNAS/TemporaryPage.html


Added Footnote re YA-1713 comparison:
==============================

Ken Nist's model of the Wade YA-1713 antenna shows a rapid drop-off at the upper 3 Mhz of the 6Mhz Ch 13 bandwidth.
The model results for Ch 7-12 are accepted as close to real-world, but Ch 13 model results are not. I used the exact data that was published on the hdtvprimer website for YA-1713, so this comparison shows the rapid fall-off for Ch 13.

300Ohm posted this comment concerning the model results of YA-1713:
Yep, but my point is, when using the YA-1713 graph in comparison, at least a footnote should be made about the channel 13 drop off, given what we now know.

(Winegard claiming 10.3 dbd on channel 13 on their specs http://winegard.com/kbase/upload/ya-1713.pdf )

Regarding a possible explanation of the rapid Ch 13 drop-off of the YA-1713 model by Ken Nist, I offered this possible explanation in the YA-1713 thread --> http://www.digitalhome.ca/forum/showpost.php?p=1108148&postcount=16
The winegard claim of 10.3 dBd or 12.45dBi is very close to the gain in the reference post above.
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I thought we werent going to use that YA-1713 channel 13 drop off. I would just level the graph for it as the same as channel 12 and call it done, heh.
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N
Two more top hat models with single reflector plane

Those two are not mods, they would require fresh build.
They probably do not achieve the best possible gain, but I do not have
an optimizer that could do VHF-hi and UHF sweep at the same time.

If JED runs his magic on them, the numbers would probably improve....


--------------------------------------------------------------------------
GH0n3 - only has 3 narod reflectors and no UHF reflectors:
Code: 
CM  GH0n3
CE
SY radius=0.003175
SY a1=0.234361
SY a2=0.218973
SY a3=0.15951
SY b=0.124312
SY feed=0.050038
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.199424
SY n_b_l=b
SY n_h=0.06666
SY n_b_z=a1pa2pa3*.7071+0.012
SY n_top_z=n_b_z+n_h
SY n_b_ystart=-0.18817	'-feed-0.70711*a1ma2pa3-n_b_ysp
SY n_b_yend=n_b_ystart-n_b_l
SY n_back=-0.33032
SY n_refl_size=0.423659
SY n_refl_z=0.432659
SY n_refl_size1=0.46134
GW	1	9	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	9	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	7	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	5	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	11	3	0	-n_top_l	n_top_z	0	n_b_ystart	n_b_z	radius
GW	14	5	0	n_b_ystart	n_b_z	0	n_b_yend	n_b_z	radius
GX	20	010
GW	10	17	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	33	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GX	40	001
GW	100	7	0	-feed	0	0	feed	0	radius
GW	16	37	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	4	0	1			
FR	0	0	0	0	585	0
RP	0	60	73	1001	0	0	3	5		
EN

Gain predictions:
Code: 
Ch	Freq 	R-Gain	R-in	X-in	SWR	N-Gain
	171	9.32	420	-372.28	2.87	8.17
	174	9.28	385.86	-239.95	2.08	8.71
7	177	9.21	371.87	-158.22	1.67	8.93
	180	9.15	366.09	-103.07	1.44	9
8	183	9.08	364.13	-62.81	1.31	9
	186	9.02	364.5	-31.04	1.24	8.97
9	189	8.96	366.99	-4.05	1.22	8.92
	192	8.9	371.99	20.31	1.25	8.85
10	195	8.85	380.18	43.27	1.31	8.77
	198	8.81	392.46	65.41	1.39	8.69
11	201	8.77	409.97	86.88	1.49	8.6
	204	8.73	434.16	107.35	1.6	8.49
12	207	8.69	466.98	125.82	1.74	8.36
	210	8.66	510.94	140.14	1.89	8.23
13	213	8.62	569.03	146.1	2.06	8.06
	216	8.57	643.89	135.72	2.27	7.86
	219	8.52	734.69	94.95	2.5	7.64
						
	467	6.81	169.87	-2.52	1.77	6.46
14	473	7.44	174.61	4.65	1.72	7.13
15	479	8.05	176.09	11.62	1.71	7.74
16	485	8.61	175.88	20.12	1.72	8.3
17	491	9.13	175.48	30.29	1.74	8.8
18	497	9.6	175.7	41.73	1.76	9.26
19	503	10.01	176.89	54.06	1.78	9.66
20	509	10.37	179.24	66.99	1.8	10
21	515	10.66	182.87	80.33	1.82	10.28
22	521	10.92	187.89	93.87	1.83	10.53
23	527	11.13	194.41	107.45	1.85	10.73
24	533	11.32	202.51	120.88	1.86	10.91
25	539	11.49	212.29	133.95	1.87	11.07
26	545	11.63	223.81	146.41	1.87	11.21
27	551	11.74	237.11	158	1.87	11.32
28	557	11.84	252.21	168.45	1.87	11.42
29	563	11.92	269.1	177.42	1.87	11.5
30	569	11.99	287.76	184.53	1.86	11.58
31	575	12.04	308.09	189.35	1.85	11.64
32	581	12.09	329.91	191.37	1.83	11.7
33	587	12.14	352.88	189.99	1.82	11.76
34	593	12.17	376.46	184.56	1.8	11.8
35	599	12.2	399.79	174.53	1.77	11.85
36	605	12.22	421.68	159.47	1.75	11.89
37	611	12.23	440.7	139.37	1.71	11.92
38	617	12.24	455.29	114.63	1.68	11.95
39	623	12.26	463.81	86.23	1.63	12
40	629	12.29	464.86	55.77	1.59	12.06
41	635	12.31	457.5	25.54	1.53	12.11
42	641	12.34	441.73	-1.71	1.47	12.18
43	647	12.35	418.67	-23.26	1.4	12.23
44	653	12.35	390.45	-37.06	1.33	12.26
45	659	12.32	359.73	-42	1.25	12.27
46	665	12.25	329.24	-38.04	1.16	12.22
47	671	12.13	301.33	-26.04	1.09	12.12
48	677	11.93	277.74	-7.37	1.08	11.92
49	683	11.65	259.5	16.37	1.17	11.62
50	689	11.28	247.18	43.6	1.29	11.21
51	695	10.8	240.86	73.01	1.42	10.67
52	701	10.24	240.43	103.46	1.55	10.03
	707	9.59	245.63	134.08	1.69	9.29

--------------------------------------------------------------------------
GH2n3 has 2 UHF reflectors and 3 narod reflectors:
Code: 
CM GH2n3
CE
SY radius=0.003175
SY a1=0.234294
SY a2=0.22048
SY a3=0.160832
SY b=0.124863
SY feed=0.050366
SY a1ma2=a1-a2
SY a1pa2=a1+a2
SY a1ma2pa3=a1ma2+a3
SY a1pa2pa3=a1pa2+a3
SY n_top_l=0.197072
SY n_b_l=b
SY n_h=0.066132
SY n_b_z=a1pa2pa3*.7071+0.012
SY n_top_z=n_b_z+n_h
SY n_b_ystart=-0.19021	'-feed-0.70711*a1ma2pa3-n_b_ysp
SY n_b_yend=n_b_ystart-n_b_l
SY n_back=-0.33032
SY n_refl_size=0.406734
SY n_refl_z=0.426831
SY n_refl_size1=0.458474
SY n_refl_size2=0.270314
SY n_refl_z2=0.239972
GW	1	9	0	-feed	0	0	-feed-0.70711*a1	0.70711*a1	radius
GW	2	9	0	-feed-0.70711*a1	0.70711*a1	0	-feed-0.70711*a1ma2	0.70711*a1pa2	radius
GW	3	7	0	-feed-0.70711*a1ma2	0.70711*a1pa2	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	radius
GW	4	5	0	-feed-0.70711*a1ma2pa3	0.70711*a1pa2pa3	0	-feed-0.70711*a1ma2pa3-b	0.70711*a1pa2pa3	radius
GW	11	3	0	-n_top_l	n_top_z	0	n_b_ystart	n_b_z	radius
GW	14	5	0	n_b_ystart	n_b_z	0	n_b_yend	n_b_z	radius
GX	20	010
GW	10	17	0	n_top_l	n_top_z	0	-n_top_l	n_top_z	radius
GW	15	33	n_back	-n_refl_size	n_refl_z	n_back	n_refl_size	n_refl_z	radius
GW	15	33	n_back	-n_refl_size2	n_refl_z2	n_back	n_refl_size2	n_refl_z2	radius
GX	40	001
GW	100	7	0	-feed	0	0	feed	0	radius
GW	16	37	n_back	-n_refl_size1	0	n_back	n_refl_size1	0	radius
GE	0
LD	5	0	0	0	24900000
GN	-1
EK
EX	0	100	4	0	1			
FR	0	0	0	0	585	0
RP	0	60	73	1001	0	0	3	5		
EN
with gain predictions:
Code: 
Ch	Freq 	R-Gain	R-in	X-in	SWR	N-Gain
	171	9.38	322.61	-452.06	3.86	7.54
	174	9.58	299.25	-254.29	2.28	8.86
7	177	9.62	304.59	-140.72	1.59	9.39
	180	9.58	319.28	-71.58	1.27	9.52
8	183	9.5	335.18	-29.19	1.15	9.48
	186	9.41	348.17	-3.03	1.16	9.39
9	189	9.31	356.69	14.36	1.2	9.28
	192	9.21	361.13	28.45	1.23	9.16
10	195	9.09	363.08	42.95	1.26	9.03
	198	8.97	364.7	60.16	1.31	8.89
11	201	8.85	368.35	81.47	1.38	8.74
	204	8.71	376.62	107.73	1.48	8.55
12	207	8.55	392.73	139.58	1.62	8.3
	210	8.37	421.33	177.4	1.81	7.99
13	213	8.18	470.05	220.58	2.07	7.62
	216	7.95	552.14	264.8	2.39	7.15
	219	7.69	689.59	292.78	2.79	6.59
						
						
	467	7.59	155.91	22.4	1.94	7.12
14	473	8.34	167.36	28.91	1.82	7.96
15	479	8.96	173.17	33.01	1.76	8.62
16	485	9.49	174.9	38.96	1.76	9.15
17	491	9.96	175.52	47.88	1.77	9.61
18	497	10.38	176.85	59.16	1.79	10.01
19	503	10.78	179.71	71.97	1.81	10.4
20	509	11.14	184.42	85.69	1.83	10.75
21	515	11.47	191.2	99.85	1.84	11.08
22	521	11.78	200.25	114.04	1.84	11.38
23	527	12.06	211.73	127.78	1.83	11.67
24	533	12.31	225.7	140.56	1.83	11.92
25	539	12.51	242.19	151.81	1.81	12.13
26	545	12.67	261.08	160.91	1.79	12.31
27	551	12.79	282.1	167.17	1.77	12.44
28	557	12.89	304.77	169.91	1.74	12.56
29	563	12.96	328.34	168.53	1.71	12.65
30	569	13.02	351.86	162.6	1.68	12.73
31	575	13.07	374.22	151.99	1.65	12.8
32	581	13.11	394.19	136.86	1.61	12.86
33	587	13.14	410.57	117.78	1.58	12.92
34	593	13.15	422.36	95.69	1.54	12.95
35	599	13.16	428.87	71.86	1.5	12.98
36	605	13.16	429.89	47.69	1.47	13
37	611	13.16	425.64	24.43	1.43	13.02
38	617	13.16	416.54	3.1	1.39	13.04
39	623	13.17	403.13	-15.41	1.35	13.07
40	629	13.18	386	-30.28	1.31	13.1
41	635	13.19	365.95	-40.78	1.26	13.13
42	641	13.18	343.99	-46.35	1.22	13.14
43	647	13.16	321.18	-46.7	1.18	13.13
44	653	13.11	298.63	-41.82	1.15	13.09
45	659	13.02	277.42	-31.87	1.14	13
46	665	12.88	258.47	-17.29	1.18	12.85
47	671	12.68	242.57	1.34	1.24	12.63
48	677	12.4	230.35	23.36	1.32	12.32
49	683	12.04	222.27	48.03	1.42	11.91
50	689	11.58	218.64	74.6	1.53	11.38
51	695	11.03	219.6	102.38	1.65	10.76
52	701	10.4	225.2	130.71	1.77	10.05
	707	9.72	235.4	159.05	1.89	9.29
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