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  1. ghz24

    Model colection

    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...
  2. ghz24

    Model colection

    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...
  3. ghz24

    Model colection

    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...
  4. ghz24

    Model colection

    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...
  5. ghz24

    Model colection

    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...
  6. ghz24

    Model colection

    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...
  7. ghz24

    Model colection

    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) 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...
  8. ghz24

    Model colection

    This is a simple variable slope dipole vertical or horizontal or any angle in between. AGT 0.996 (-0dB) 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...
  9. ghz24

    Model colection

    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...
  10. ghz24

    ground to model over

    I originally picked average figuring it was just that, average. due to my recent comparisons it became obvious that average is far from average. "Average" values consistently fall outside the range defined by good and poor How can average be at one extreme not in the center ? I think we must...
  11. ghz24

    ground to model over

    Freespace is a great equalizer but, at cb frequencies it is virtually impossible to escape the effects of the ground I'd like to find or reach a consensus on what type kind of environment and ground we should model over so as to adequately demonstrate the properties (in general) for the antenna...
  12. ghz24

    sigma4 article is online

    Hi all, Wow looks like I missed lots of fray. I don't know which theory is right (if either). Sorry this post turned out a little long winded despite my attempts to keep it short. Shockwave : For repeatedly belittling with such authority 4nec2 and nec engine software in general even though you...
  13. ghz24

    Crossed Yagi antenna gain

    Cross polarization loss I know I'm a little late to this party but I can't resist. Hi Shockwave Your logic seams dead on to me but... It's actually 3 dB loss. The formula is Cosine theta squared. So Cos (45)= 0.7071..... , squared= 0.5 as in half the signal or 3 dB. Using the same...
  14. ghz24

    Radial length and angle radiation patterns... Long...

    To avoid the sharp angle problem make a short wire stub horizontal to the mast and attach the angleed radials to the end of the stub. Also be sure toi use an EK (extended kernel) "card" The AGT should tell you how compromized the model is or isn;t.
  15. ghz24

    New thread to debate V-4000

    Where did the extra gain I see in the model I posted come from? Why does this show in phase radiation. nosepc this jpg is "show phase as color." option see how all the radials are the same color. and it is only slightly out of phase with the main radiator. Same color = same phase. Gee I...
  16. ghz24

    New thread to debate V-4000

    I see, you manually made the radials and they show in phase, not you manually made the radials show in phase. CM 11 meter cb by ghz24 CE SY z=324 'driven element length SY rh=108 'ring height SY zp=30 'avoid segment errors durring sweeps SY rsf=0.5 'changes ring diameter SY agl=240...
  17. ghz24

    New thread to debate V-4000

    Hope that's cool enough because I'm just getting power on again after tornado. Originally Posted by The DB the bottom segments are at a highly acute angle with the main element connection. This causes a quick change in average gain. I'd bet that the average gain being off is the reason...
  18. ghz24

    ASTROPLANE best vertical antenna ever?

    OK I have to retract my previous statement I reversed wires on nospec's Inverted Vee model and found no effect at all. I know I've seen it matter before I just can't remember where. Must be something else at work. Wish I could remember what model it was so I could pin-point the circumstances. I...
  19. ghz24

    ASTROPLANE best vertical antenna ever?

    What I meant by compare for yourself was: "Copy" the text in the highlighted Code box . "paste" the text into a new text file (like notepad) and save as "righttest.nec" (or wrongtest.nec ) save/move them to the "4nec2\models" folder. Open 4nec2, click on the folder icon near the top left...
  20. ghz24

    ASTROPLANE best vertical antenna ever?

    wire ends You don't get an error message and it does matter. I was trying to recreate someones results with this model but it demonstrates what can happen if you reverse wires. I think this is the right way. CM 11 meter endfed halfwave (right ends) by ghz24 CE GW 1 9 0 0 0 0 0 210...