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Thread: Virevent & Turbine advanced CP antennas tutorial.

  1. #41
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    Hugo could you give dimensions for 1258Mhz please..

  2. #42
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    For 1258 use 1280, even if narrow band my antenna still cover 1258 nicely. If you feel perfectionist you can multiply by 1280/1258.

    Hugo

  3. #43
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    Hugo is it multiply or divide?

    1280x1258 = 1610240
    1280/1258 = 1.0174 add it to the given dimensions

    Im confused

    Dimensions of Turbine
    1280mhz

    A 4,291
    B 3,269
    C 3,069
    D 0,978
    E 1,382

    I will pm you on rcgroups..Thanks


    Last edited by Nelapaty; 12th December 2012 at 09:22 AM.

  4. #44
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    You multiply by the result of the division

    Dimensions * (1280/1258)
    example:

    A. 4.291 * (1280/1258)
    = 4.291 * 1.0175
    = 4.366

    -Hugo

  5. #45
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    Super Thanks

  6. #46
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    what happens if you build these upside down? i just made a 1280 windmill and realized that i put the long arm of the element on the top and the short on the bottom connecting to the ground...
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    [Flight Box] - Watch, Cry, Subscribe.
    youtube.com/jnacoustic
    [B]
    [SIZE=2][COLOR=darkorange][COLOR=dimgray]NE[COLOR=darkorange]FPV[/COLOR][/COLOR][/COLOR][/SIZE][SIZE=2][COLOR=darkorange]^[/COLOR][/SIZE][/B]

  7. #47
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    I don't think it'll work, you may have good SWR, but circularity won't be there.

    -Hugo

  8. #48
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    Thanks hugo. I'll rebuild it then. The Fan came out good though!
    [Flight Box] - Watch, Cry, Subscribe.
    youtube.com/jnacoustic
    [B]
    [SIZE=2][COLOR=darkorange][COLOR=dimgray]NE[COLOR=darkorange]FPV[/COLOR][/COLOR][/COLOR][/SIZE][SIZE=2][COLOR=darkorange]^[/COLOR][/SIZE][/B]

  9. #49
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    It looks to me like this technique is slightly simpler to get precise compared to your newer method. Could you list the dimensions for the older technique for a 1280 MHz windmill and fan?

  10. #50
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    I went ahead and reverse-engineered the numbers. Correct me if I'm wrong:
    Windmill
    A 4.732
    B 3.375
    C 3.175
    D 1.087
    E 2.553


    Fan
    A 4.428
    B 3.224
    C 3.024
    D 0.991
    E 1.809

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