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Directional 11 meter for SSB to europe

Discussion in 'CB Antennas' started by mb91w126, Jul 29, 2014.

  1. dxbarefoot

    dxbarefoot W9WDX Amateur Radio Club Member

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    That is what I am referring to, At field day we do this to utilize any additional gain in a specific direction of interest. We have done it with both inverted V's and horizontal dipoles.


     

  2. GnG8d

    GnG8d Well-Known Member

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    Doesn't that make the antenna more omni directional? I thought I read once that it did, but I don't know.

    I'm still confused I guess, lol. A horizontal dipole is already horizontal. But you are laying an inverted V horizontal as well.
     
  3. mb91w126

    mb91w126 Active Member

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    reply to m42duster

    I'm quite innovative and can build things with precision. not worried about $$$'s, forgiveness is easier achieved than permission.
     
    Slowmover likes this.
  4. GnG8d

    GnG8d Well-Known Member

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    You'll just need do decide if you want to build a homebrew, or assemble purchased design. Yagi's and quad's are mostly going to require a tower, while dipoles, moxons etc will not. But you've been here for awhile, poke around in this very section.
     
  5. BammBamm

    BammBamm Instigators ...173 on the southside.

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    Klondike Mike How do you "point" a Imax 2000? It's a omni directional antenna. :confused: I had one but never heard of a way to make it directional?:confused:
     
  6. dxbarefoot

    dxbarefoot W9WDX Amateur Radio Club Member

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    The Horizontal Dipole or Flat Top as Ham-universe refers to it as does promote directivity where an inverted ā€œVā€ becomes omnidirectional when the ends are lowered towards the ground.

    The Dipole Antenna - What is a dipole Antenna?
     
  7. GnG8d

    GnG8d Well-Known Member

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    Yup, I'm officially confused. You said the ends were pointed NE and SE which sounds like a horizontal "V", not an inverted, or vertical "V".

    I just modeled a horizontal dipole, an inverted "V" dipole, and a horizontal "V" dipole and at 20' to the feed-point and there isn't much difference in gain between the 3. But the horizontal dipole does have the most gain and is the most directional. Although at 20' they are all pretty directional with deeper side nulls going to the horizontal dipole, they are literally within 1dB of each other in total gain and the horizontal V being the most directional.

    In free space the inverted V and the horizontal V look identical and still exhibit nulls at the ends @-6.9dB and the horizontal dipole again close to 1dB ahead in total gain, has nulls @-21dB and is the most directional.

    Incidentally, the horizontal V actually takes up more real estate than the inverted V if you're looking to save space.
     
  8. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    30 to 45 degree is the beam heading for a YAGI into EU from my QTH here in Florida. May be just a few degrees less the farther North your QTH is.


    Back to the original topic.

    Need more information.

    How much gain do you want this directional antenna to have? Are you interested in any rejection I.E. F/B??
     
  9. GnG8d

    GnG8d Well-Known Member

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    We are on topic (y)
     
  10. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    Once Again Oldy but Goody

    I have brought this out of the archives many times here...
    I think someone actually made one few years back and was quite surprised.
    I built one back in my "Novice" days and suspended it out of a third story apartment balcony so the top was about 35ft...(if the old memory remembers correctly)....worked the world to the West from Iowa and could swing it a little to get NW to Japan and Alaska....talking East was not so good that was through the building but did get the East coast once in awhile when the band was "real" good...
    Makes a Great Camping/Field Day Antenna hung form a couple of trees so you can turn it...
    All the Best
    Gary

    PS: multiply lengths X 1.04= 11 meters
     

    Attached Files:

    #25 BJ radionut, Jul 30, 2014
    Last edited: Jul 30, 2014
    Slowmover likes this.
  11. vkrules

    vkrules Sr. Member

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    Great antenna.(y)
     
  12. mb91w126

    mb91w126 Active Member

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    15 to 20 gain would be nice but then I'm not certain how many FT**2 I can support on top of the house.

    I'm not concerned with rejecting any noise from the w-wsw.
     
  13. mb91w126

    mb91w126 Active Member

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    I think the co-phasing bollocks of the 102" whips would be a fun design to try and it's quite clandestine. I sincerely doubt if my wife would even notice it.

    I found a modeling program for the moxon design so it easy to get the dimensions correct.

    The next debatable topic would be the construction components.

    While running the modeling program I noticed that there is 3" difference on the x axis and 2" difference on the y axis between channel 1 and 40.

    So if I wanted to tune this to be optimal between either end, I could use .5" emt and add couplings to adjust the length of individual components.
    I deduced this was an acceptable approach as my macov58 seemed to be similar in construction.

    for static lengths, I have seen heavy gauge wire suspended in small diameter pvc, and suspended from fiberglass rods.

    other conductors, .5"copper pipe, .25" copper tubing, solid copper rods.

    your thoughts??
     
  14. M0GVZ

    M0GVZ Sr. Member

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    There's no difference. Might as well just use the horizontal dipoles. The only difference is that instead of the direction of the lobes being broadside to the dipole, the direction of the lobes are on the intersecting line of the angle between the legs on an inverted V laid flat. Its far easier to turn a dipole than an inverted V.
     
  15. M0GVZ

    M0GVZ Sr. Member

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    The differences basically result in a slight difference in forward gain or front/back ratio. Pick the mid point for the dimensions to use.

    Mine is built from thick speaker cable split to single core and using fibreglass rods arranged in a cross pattern with a thinner one going into a wider one to allow for adjustment. People have built them on a H frame as well. The wider the outside diameter of the conductor you're using for the antenna, the wider the bandwidth will be.
     

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