SBGH w/o reflector: gain plot?

[fgm]

If available, can someone please post the gain plot for the single bay GH w/o reflector antenna?
Thanks

[Xauto]

fgm: If you look here ther is a chart for gen.1 and gen 2, and a frac.
http://www.digitalhome.ca/forum/show...7&postcount=17

[bokakob]

Here is Single Gray-Hoverman Antenna link showing detailed graphs:

http://www.digitalhome.ca/forum/show...&postcount=777

[holl_ands]

Following the "GH Gold Design" link, here's webpage showing various Gray-Hoverman designs:
http://www.jedsoft.org/fun/antennas/dtv/gh.html
You can comment out the reflectors in the various NEC files and plot them yourself....

[300ohm]

JEDs optimized reflector designs dont work too well reflector-less. For example, his GH10 without a reflector is a disaster.

Heres JEDs reflector-less version, not posted on that site :

CM Model: hov15-hovzz3_D7mm_simplex
CM Driven Element
CM Zigzag Geom
CM  phi = 26.2557 degrees (bend angle)
CM  g0 = 3 3/8 in. [86 mm], z0 = 0 in. [0 mm], theta=45 degrees
CM  a1=10 7/16 in. [265 mm], g1=17 3/8 in. [441 mm], z1=7 3/4 in. [197 mm]
CM  a2=7 13/16 in. [198 mm], g2=6 15/16 in. [176 mm], z2=13 9/16 in. [345 mm]
CM  a3=6 9/16 in. [167 mm], g3=15 11/16 in. [399 mm], z3=18 1/2 in. [469 mm]
CM  b=10 11/16 in. [272 mm], width=37 1/16 in. [942 mm], z=18 1/2 in. [469 mm]
CM  Total wire length per side: 71 in. [1804 mm]
CM COM: (2 11/16 in. [69 mm], 0 in. [0 mm], 0 in. [0 mm])
CM BBOX: dX=8.306591913628353, dY=37.08141716527788, dZ=36.946500698302394
CM COM Turning radius: 19.368463715827723
CM Min Turning radius: 19.00020373709793
CM Element Info:
CM   1: length=3 3/8 in. [86 mm], dx=0 in. [0 mm], dy=3 3/8 in. [86 mm], dz=0 in. [0 mm]
CM      X0=0 in. [0 mm], Y0=-1 11/16 in. [-43 mm], Z0=0 in. [0 mm]
CM      X1=0 in. [0 mm], Y1=1 11/16 in. [43 mm], Z1=0 in. [0 mm]
CM   2: length=11 in. [279 mm], dx=3 7/16 in. [87 mm], dy=7 in. [177 mm], dz=7 3/4 in. [197 mm]
CM      X0=0 in. [0 mm], Y0=-1 11/16 in. [-43 mm], Z0=0 in. [0 mm]
CM      X1=3 7/16 in. [87 mm], Y1=-8 11/16 in. [-220 mm], Z1=7 3/4 in. [197 mm]
CM   3: length=11 in. [279 mm], dx=3 7/16 in. [87 mm], dy=7 in. [177 mm], dz=7 3/4 in. [197 mm]
CM      X0=0 in. [0 mm], Y0=-1 11/16 in. [-43 mm], Z0=0 in. [0 mm]
CM      X1=3 7/16 in. [87 mm], Y1=-8 11/16 in. [-220 mm], Z1=-7 3/4 in. [-197 mm]
CM   4: length=11 in. [279 mm], dx=3 7/16 in. [87 mm], dy=7 in. [177 mm], dz=7 3/4 in. [197 mm]
CM      X0=0 in. [0 mm], Y0=1 11/16 in. [43 mm], Z0=0 in. [0 mm]
CM      X1=3 7/16 in. [87 mm], Y1=8 11/16 in. [220 mm], Z1=7 3/4 in. [197 mm]
CM   5: length=11 in. [279 mm], dx=3 7/16 in. [87 mm], dy=7 in. [177 mm], dz=7 3/4 in. [197 mm]
CM      X0=0 in. [0 mm], Y0=1 11/16 in. [43 mm], Z0=0 in. [0 mm]
CM      X1=3 7/16 in. [87 mm], Y1=8 11/16 in. [220 mm], Z1=-7 3/4 in. [-197 mm]
CM   6: length=8 3/16 in. [209 mm], dx=2 9/16 in. [65 mm], dy=5 3/16 in. [132 mm], dz=5 13/16 in. [148 mm]
CM      X0=3 7/16 in. [87 mm], Y0=-8 11/16 in. [-220 mm], Z0=7 3/4 in. [197 mm]
CM      X1=7/8 in. [22 mm], Y1=-3 7/16 in. [-88 mm], Z1=13 9/16 in. [345 mm]
CM   7: length=8 3/16 in. [209 mm], dx=2 9/16 in. [65 mm], dy=5 3/16 in. [132 mm], dz=5 13/16 in. [148 mm]
CM      X0=3 7/16 in. [87 mm], Y0=-8 11/16 in. [-220 mm], Z0=-7 3/4 in. [-197 mm]
CM      X1=7/8 in. [22 mm], Y1=-3 7/16 in. [-88 mm], Z1=-13 9/16 in. [-345 mm]
CM   8: length=8 3/16 in. [209 mm], dx=2 9/16 in. [65 mm], dy=5 3/16 in. [132 mm], dz=5 13/16 in. [148 mm]
CM      X0=3 7/16 in. [87 mm], Y0=8 11/16 in. [220 mm], Z0=7 3/4 in. [197 mm]
CM      X1=7/8 in. [22 mm], Y1=3 7/16 in. [88 mm], Z1=13 9/16 in. [345 mm]
CM   9: length=8 3/16 in. [209 mm], dx=2 9/16 in. [65 mm], dy=5 3/16 in. [132 mm], dz=5 13/16 in. [148 mm]
CM      X0=3 7/16 in. [87 mm], Y0=8 11/16 in. [220 mm], Z0=-7 3/4 in. [-197 mm]
CM      X1=7/8 in. [22 mm], Y1=3 7/16 in. [88 mm], Z1=-13 9/16 in. [-345 mm]
CM  10: length=6 15/16 in. [176 mm], dx=2 3/16 in. [55 mm], dy=4 3/8 in. [111 mm], dz=4 7/8 in. [124 mm]
CM      X0=7/8 in. [22 mm], Y0=-3 7/16 in. [-88 mm], Z0=13 9/16 in. [345 mm]
CM      X1=3 1/16 in. [77 mm], Y1=-7 7/8 in. [-199 mm], Z1=18 1/2 in. [469 mm]
CM  11: length=6 15/16 in. [176 mm], dx=2 3/16 in. [55 mm], dy=4 3/8 in. [111 mm], dz=4 7/8 in. [124 mm]
CM      X0=7/8 in. [22 mm], Y0=-3 7/16 in. [-88 mm], Z0=-13 9/16 in. [-345 mm]
CM      X1=3 1/16 in. [77 mm], Y1=-7 7/8 in. [-199 mm], Z1=-18 1/2 in. [-469 mm]
CM  12: length=6 15/16 in. [176 mm], dx=2 3/16 in. [55 mm], dy=4 3/8 in. [111 mm], dz=4 7/8 in. [124 mm]
CM      X0=7/8 in. [22 mm], Y0=3 7/16 in. [88 mm], Z0=13 9/16 in. [345 mm]
CM      X1=3 1/16 in. [77 mm], Y1=7 7/8 in. [199 mm], Z1=18 1/2 in. [469 mm]
CM  13: length=6 15/16 in. [176 mm], dx=2 3/16 in. [55 mm], dy=4 3/8 in. [111 mm], dz=4 7/8 in. [124 mm]
CM      X0=7/8 in. [22 mm], Y0=3 7/16 in. [88 mm], Z0=-13 9/16 in. [-345 mm]
CM      X1=3 1/16 in. [77 mm], Y1=7 7/8 in. [199 mm], Z1=-18 1/2 in. [-469 mm]
CM  14: length=11 15/16 in. [303 mm], dx=5 1/4 in. [134 mm], dy=10 11/16 in. [272 mm], dz=0 in. [0 mm]
CM      X0=3 1/16 in. [77 mm], Y0=-7 7/8 in. [-199 mm], Z0=18 1/2 in. [469 mm]
CM      X1=8 5/16 in. [211 mm], Y1=-18 9/16 in. [-471 mm], Z1=18 1/2 in. [469 mm]
CM  15: length=11 15/16 in. [303 mm], dx=5 1/4 in. [134 mm], dy=10 11/16 in. [272 mm], dz=0 in. [0 mm]
CM      X0=3 1/16 in. [77 mm], Y0=-7 7/8 in. [-199 mm], Z0=-18 1/2 in. [-469 mm]
CM      X1=8 5/16 in. [211 mm], Y1=-18 9/16 in. [-471 mm], Z1=-18 1/2 in. [-469 mm]
CM  16: length=11 15/16 in. [303 mm], dx=5 1/4 in. [134 mm], dy=10 11/16 in. [272 mm], dz=0 in. [0 mm]
CM      X0=3 1/16 in. [77 mm], Y0=7 7/8 in. [199 mm], Z0=18 1/2 in. [469 mm]
CM      X1=8 5/16 in. [211 mm], Y1=18 9/16 in. [471 mm], Z1=18 1/2 in. [469 mm]
CM  17: length=11 15/16 in. [303 mm], dx=5 1/4 in. [134 mm], dy=10 11/16 in. [272 mm], dz=0 in. [0 mm]
CM      X0=3 1/16 in. [77 mm], Y0=7 7/8 in. [199 mm], Z0=-18 1/2 in. [-469 mm]
CM      X1=8 5/16 in. [211 mm], Y1=18 9/16 in. [471 mm], Z1=-18 1/2 in. [-469 mm]
CE
GW 1 11 0 -0.0432011 0 0 0.0432011 0 0.0035
GW 2 39 0 -0.0432011 0 0.0873661 -0.220318 0.197492 0.0035
GW 3 39 0 -0.0432011 0 0.0873661 -0.220318 -0.197492 0.0035
GW 4 39 0 0.0432011 0 0.0873661 0.220318 0.197492 0.0035
GW 5 39 0 0.0432011 0 0.0873661 0.220318 -0.197492 0.0035
GW 6 29 0.0873661 -0.220318 0.197492 0.022096 -0.0879962 0.345036 0.0035
GW 7 29 0.0873661 -0.220318 -0.197492 0.022096 -0.0879962 -0.345036 0.0035
GW 8 29 0.0873661 0.220318 0.197492 0.022096 0.0879962 0.345036 0.0035
GW 9 29 0.0873661 0.220318 -0.197492 0.022096 0.0879962 -0.345036 0.0035
GW 10 25 0.022096 -0.0879962 0.345036 0.0770327 -0.199369 0.469221 0.0035
GW 11 25 0.022096 -0.0879962 -0.345036 0.0770327 -0.199369 -0.469221 0.0035
GW 12 25 0.022096 0.0879962 0.345036 0.0770327 0.199369 0.469221 0.0035
GW 13 25 0.022096 0.0879962 -0.345036 0.0770327 0.199369 -0.469221 0.0035
GW 14 43 0.0770327 -0.199369 0.469221 0.210987 -0.470934 0.469221 0.0035
GW 15 43 0.0770327 -0.199369 -0.469221 0.210987 -0.470934 -0.469221 0.0035
GW 16 43 0.0770327 0.199369 0.469221 0.210987 0.470934 0.469221 0.0035
GW 17 43 0.0770327 0.199369 -0.469221 0.210987 0.470934 -0.469221 0.0035
GE 0
EK 0
FR	0	38	0	0	473	6
EX 0 1 6 0 1
GN -1 0 0 0 0.0 0.0  0.0  0.0  0.0  0.0
RP 0 60 73 1001 0 0 3 5
EN

[Feig]

I am sure that "Centipede" could be much improved.
It would be nice if this comparison composite result wouldn't be burried in the hundreds of posts of the "Area 51" becuse the results are speaking pretty clearly. The file used for comparison is listed below the composite picture for those who what to try doing this task.

bokakob, I couldn't agree more. The work you have been doing is great on the centipede. Have you compared the centipede with and without the wiskers? I was wondering what would happen if you added wiskers to the SBGH.

Great Work

Feig

[ManBOOYA]

Does Jed's reflectorless GH need the angle in it? Or is that just to make is have slightly more gain in one direction?

[300ohm]

Or is that just to make is have slightly more gain in one direction?

Yes, and it also gives a wider beamwidth on the backside.

[ManBOOYA]

Would a NAROD bent at the same angle allow this antenna to recieve Hi-VHF. I'm looking for ch 9 and 11 specifically

[300ohm]

Probably, but I'll have to check to make sure there arent any unintended consequences. NARODs in general are very sensitive to gain direction flipping. And just because the v is pointed one way doesnt mean the peak gain direction is that way, as I found out when trying to turn my small Antennacraft corner reflector into a CM2016 clone, heh.