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Thread: Virevent & Turbine advanced CP antennas tutorial.

  1. #1
    Shedding light over FPV HugeOne's Avatar
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    Virevent & Turbine advanced CP antennas tutorial.

    I designed these two antennas for FPV purpose. They stress on axial ratio (0.9 or better) for maximum multipath rejection.

    Tutorial

    They can also be purchased from www.truerc.net/canada among others.

    -Hugo

  2. #2
    Engineer for Jesus Christ IBCrazy's Avatar
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    One of these days you and I need to finish the designs we talked about...

    For those who might be reading this, Hugo and I have decided to start designing together so keep an eye out for the products of our joint efforts.

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

    videoaerialsystems.com - Performance video piloting

  3. #3
    could quit if I wanted to volto's Avatar
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    Awesome tutorials, thanks Hugo! Any chance you can include dimensions and angles for the fan antenna as well? Also, will 0.035" (0.889 mm) MIG wire work for all frequencies, or will I have to slightly change the dimensions? I noticed you said to use 0.8 for all but 5.8ghz, so is this wire not going to work for 5.8ghz antennas (need thinner wire)? I have seen people build 5.8 CL and SPW from big fat romex type copper wire.

    I'm glad the two of you are cooperating, that is awesome! Two geniuses working for a common goal, can't wait to see what you come up with.
    Don't steal, the government hates competition.

  4. #4
    Kiwi in Germany whakahere's Avatar
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    nice. I am going to give one a go. Question, since I have a cp and spw where would you think this would be better? On the rx or tx --- on 5.8ghz


    Looking forward to your other designs guys.
    Whaka's Tinkerings blog --> http://fpvlab.com/forums/showthread.php?36623-Whaka-s-Tinkering&p=631753#post631753
    Battle H Virus (home build basher quad tutorial) --> ]http://fpvlab.com/forums/showthread.php?12544-Tutorial-Battle-H-Virus
    Range record on 5.8ghz 200mw 24km --> http://www.rcgroups.com/forums/showthread.php?t=1441664

    The one thing I know how to do well with FPV - crash. All in a day of fun!
    I believe landing is a full body experience .... I do my best to aim for your body.

  5. #5
    Navigator mrdlg2u's Avatar
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    I have built a bunch of antennas thanks to tutorials like these. I even bought a hand held spectrum analyzer to check my work.

    What do you think the effect of using something like expanding foam to in case the antennas?
    or may be just fill the center with the expanding foam, not covering the outer surface of the wire.

    I don't want to mess with any of my antennas until I get some thoughts on the idea... LOL

    Later,
    Gundy

  6. #6
    Shedding light over FPV HugeOne's Avatar
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    Yes, me an Alex are working together, be prepared for some wicked mad scientists RF devices P

    I'll have to make a chart for the Fan and its little sister the Windmill. In fact, by way things look, they may well phase out the virevent & turbine.

    I heard rumor that a CL on the Tx and a turbine on the Rx is a killer combo.

    Encasing the antennas in foam will shift frequency downward by an unknown %.

    -Hugo

  7. #7
    could quit if I wanted to volto's Avatar
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    Sweet, I want to build a fan antenna because it's only 3 elements, simple to build and from the radiation pattern looks like a winner.

    What about my 0.89 mm mig wire, will it work with the given dimensions or should I add or subtract some length, or look for some different wire?

    Thanks!
    Jerrod
    Don't steal, the government hates competition.

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

    The 3 element is called the "windmill", 5 elements is the "fan". I given them different names because making a virevent with 5 or 8 elements doesn't work, pitch angle and sizes are different.

    So to clear confusion:
    3 blades: Windmill >> Sweet Tx antenna
    4 blades: Virevent >> First born.
    5 blades: Fan >> Sweet Rx antenna
    8 blades: Turbine >> Mother of Rx antenna


    For your 0.89mm wire add 1%.

    -Hugo

  9. #9
    could quit if I wanted to volto's Avatar
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    I thought I might have gotten those two confused.

    Thanks for clearing that up about the wire.
    Don't steal, the government hates competition.

  10. #10
    Have the dimensions for the fan antenna been released yet?

    I just finished up this 5.8 turbine. How's it look?
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