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  • IZ8292SWL
    replied
    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!

    Leave a comment:


  • abcd567
    replied
    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, 22:39.

    Leave a comment:


  • wiedehopf
    replied
    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.

    Leave a comment:


  • IZ8292SWL
    replied
    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?

    Leave a comment:


  • abcd567
    replied
    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.

    Leave a comment:


  • IZ8292SWL
    replied
    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.
    [ATTACH=CONFIG]11144[/ATTACH]
    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!

    Leave a comment:


  • matysldn
    replied
    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, 18:23.

    Leave a comment:


  • abcd567
    replied
    .
    .

    Directional antenna for ADS-B?

    .

    Leave a comment:


  • abcd567
    replied

    SOURCE:
    https://www.rtl-sdr.com/tag/corner-reflector/


    Directional Antenna with corner reflector.

    Corner Reflector Antenna for 1090-Mhz.jpg
    Last edited by abcd567; 2019-10-09, 01:38.

    Leave a comment:


  • AlejandroM
    replied
    thank you for your answer. i will check.

    Leave a comment:


  • wiedehopf
    replied
    Easiest way is to block signals from one direction with a metal plate.

    Even directional antennas have large sidelobes in reception.
    Overall it gets really complicated.

    Leave a comment:


  • AlejandroM
    replied
    how can i build a directional antenna? i want one to just get data from one side.

    funny thing isnt?

    or i just incline the antenna to that side? like: _/_

    Leave a comment:


  • abcd567
    replied
    Originally posted by IZ8292SWL View Post
    Today i built the Spider Antenna without soldering!

    [ATTACH=CONFIG]11141[/ATTACH]
    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.
    Quick Spider.jpg

    Leave a comment:


  • abcd567
    replied
    Originally posted by IZ8292SWL View Post
    Anything to improve its weather resistance?
    I have to find a nice place on the roof to use it beacause the quick test on the balcony shows a nice range all over the directions but not that far.
    Quick Spider - ENHANCEMENT FOR OUTDOOR USE

    .

    Leave a comment:


  • IZ8292SWL
    replied
    Hi guys!
    Today i built the Spider Antenna without soldering!
    I tried the collinear one with no success...
    Result where really poor, maybe because i only used 6 pieces... who knows.
    Anyway the spider seems pretty consistent and easy to build!
    Results are a bit better that the modded whip (the one that you have to cut...)
    ADSB.jpg

    Anything to improve its weather resistance?
    I have to find a nice place on the roof to use it beacause the quick test on the balcony shows a nice range all over the directions but not that far.
    Immagine JPEG.jpg

    Cheers and thanks for all the projects available

    And thanks to @abcd567, always available to comment and help.
    Last edited by IZ8292SWL; 2019-11-06, 14:10.

    Leave a comment:

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