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Thread: best antenna

  1. #2831
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    Last edited by abcd567; 2019-10-09 at 01:38.

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  3. #2833
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    You may find this helpful with building any type of antenna.
    There is a lot theory about VHF/UHF antennas:

    http://www.tigereye.net.au/vk4ion/do...F_antennas.pdf

    Edit:
    And there also:
    https://www.qrz.ru/schemes/contribute/arrl/chap18.pdf
    Last edited by matysldn; 2019-10-09 at 18:23.

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    Quote Originally Posted by abcd567 View Post
    You are missing two cable ties on outer jacket to hold the radials in position. Without something to grip radials in position, wind will change their orientation, and these wont be equally distributed over 360 degrees.

    Please see two cable ties (black) in the photo below. These ties are provided specifically to grip the radials so that these dont get dis-oriented by motion or wind.
    Attachment 11144
    Hi!
    There are two transparent cable ties in that picture but are not visible!
    Also i used some silicone as suggested to cover the radials insertion.
    But i'm a bit worried about that copper radials... will they corrode over time and affect reception?
    Do i have to put something on them?
    Cheers!

  5. #2835
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    Quote Originally Posted by IZ8292SWL View Post
    But i'm a bit worried about that copper radials... will they corrode over time and affect reception?
    Do i have to put something on them?
    Apply spray paint or some sealant over exposed whip & radials to prevent corrossion.

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    Quote Originally Posted by abcd567 View Post
    Apply spray paint or some sealant over exposed whip & radials to prevent corrossion.
    Uhm ok.
    Another tiny bit of silicone?
    Actually i don't think that tiny bit layer of natural copper oxide will affect that much.
    Is like having a plastic cover over them, even thinner.
    What do you think?

  7. #2837
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    Copper oxide on the surface won't degrade the antenna.

    You might want to experiment with bending the top 0.5 to 1cm over, my spider needed quite a bit shorter of a whip to have optimal reception.

  8. #2838
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    RG6 cable comes in two varieties

    (1) Low cost: Copper coated solid steel conductor.

    (2) Better quality: solid copper conductor.

    The copper coated steel one's steel starts corroding after the copper coating has corroded.

    To check if the core wire is copper or copper coated steel, use a magnet


    If core wire is solid copper, a thin layer of copper oxide on the surface won't degrade the antenna as already advised by wiedehopf.
    Further oxidation of copper is also prevented by this surface layer.

    However if core wire is copper clad steel, the steel will continue corroding. In this case it is better to apply spray paint (non-metallic) or apply a thin layer of some sealant over the exposed metal of whip and radials.
    Last edited by abcd567; 2019-10-14 at 22:39.

  9. #2839
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    Quote Originally Posted by abcd567 View Post
    RG6 cable comes in two varieties

    (1) Low cost: Copper coated solid steel conductor.

    (2) Better quality: solid copper conductor.

    The copper coated steel one's steel starts corroding after the copper coating has corroded.

    To check if the core wire is copper or copper coated steel, use a magnet


    If core wire is solid copper, a thin layer of copper oxide on the surface won't degrade the antenna as already advised by wiedehopf.
    Further oxidation of copper is also prevented by this surface layer.

    However if core wire is copper clad steel, the steel will continue corroding. In this case it is better to apply spray paint (non-metallic) or apply a thin layer of some sealant over the exposed metal of whip and radials.
    Thank you for this tips.
    Well it looks like a coated solid stell... the magnet attracts it.
    For the moment the antenna is working great and i'm waiting for the flightaware stick.
    I also saw an antenna version with the protective plastic still attached to the copper elements.
    Does it work well as this one?
    Cheers!

  10. #2840
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    IZ8292SWL:

    If you mean this one, it works equally good.

    QuickSpider-Ver1.jpg

    https://forum.flightradar24.com/thre...-or-N-Conector

    It was my first version of Quick Spider dated 2015. Later I noticed people are so accustomed to bare copper radials and whip, they took it as a toy, and it was mostly rejected.

    Therefore I released next version in which whip's & radial's insulation was peeled off, and this design was accepted immediately
    Last edited by abcd567; 2019-10-15 at 09:05.

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