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Thread: The gatling ultra range CP array.

  1. #1
    Shedding light over FPV HugeOne's Avatar
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    Cool The gatling ultra range CP array.

    Here's my latest baby for 1280.
    It measure 16" by 16" and weight little over 1lb.




    An array of four crosshairs for a gain of 15.5db (measured at around 17db)



    But what is so special about it is that the array is circular polarized by itself. An phasing coax network put the four crosshairs in rotation (why's the name) for an axial ratio that don't fall off with beam angle but actually rise!





    So far bench test show everything is inline with the simulation, except gain is a little higher.

    -Hugo
    Last edited by HugeOne; 28th November 2013 at 01:03 AM.

  2. #2
    on a bicycle
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    Awesome stuff!

  3. #3
    Flying my Fascination BloomingtonFPV's Avatar
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    Wow. Can you compare the specs against a standard crosshair? How wide is the beam, for example? How hard will it be for you to mass produce these?
    About to maiden my Fascination...

  4. #4
    Crashing Vitamin J's Avatar
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    Like whoa!

  5. #5
    Shedding light over FPV HugeOne's Avatar
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    Here's a radiation plot, in red the standard crosshair with a beamwidth of 68deg. the gatling is 32deg. an equivalent gain halical is around 25deg.


  6. #6
    Co-Pilot FPVdude's Avatar
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    weird....

  7. #7
    Engineer for Jesus Christ IBCrazy's Avatar
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    Holy smokes! Nice work! Really nice work. How did you phase them? It looks like they are in parallel but I think I see 75 Ohm coaxial cable in there?

    -Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  8. #8
    Shedding light over FPV HugeOne's Avatar
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    Thx Alex,

    No 75 ohm in there, parallel two 50 ohm antennas you get 25 ohm, pass through a 1/4 wave 50 ohm coax you get 100 ohm, I think you already figured the rest

    Hugo

  9. #9
    Navigator Kondor-FPV's Avatar
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    Hugo,
    that's one heck of a nice antenna... damn' you got some time on your hands! it takes me forever to phase just 2 helix antennas on 2.4 using 75ohm cable.
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  10. #10
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    Can I get some hints about the lengths of coaxes between the joining coaxes, are those coaxes 1/4 wavelength or is that final piece of coax 1/4 wavelength?

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