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  • 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:


  • AlejandroM
    replied
    Originally posted by brunobl View Post
    I envy you guys. I live in a valley, I'm surrounded by hills. My horizon-limited theoretical max range is some 80-90 NM in a few selected directions, but mostly a lot less than that. So I'm thrilled every time I get a 90NM hit, knowing that my "cantenna" is maxing out its theoretical limit.
    cantenna works great, but you should try any other antenna fixed to 1090Mhz just to test.

    Leave a comment:


  • brunobl
    replied
    Originally posted by matysldn View Post
    I've got 8m to the roof and there will be a great location, but no way I will get access to it and instal an antenna.
    I envy you guys. I live in a valley, I'm surrounded by hills. My horizon-limited theoretical max range is some 80-90 NM in a few selected directions, but mostly a lot less than that. So I'm thrilled every time I get a 90NM hit, knowing that my "cantenna" is maxing out its theoretical limit.

    Leave a comment:


  • AlejandroM
    replied
    well, i just find my best antenna is cantenna! and the blue stick.

    it seems IT movie has came to my map.

    globoss.png

    do you want a ballon?...

    Leave a comment:


  • matysldn
    replied
    Originally posted by abcd567 View Post
    matysldn

    Nice built.

    Experimenting with different types of DIY antennas is fun.

    I also live in a high rise building, surrounded by other high rise buildings, and I am not allowed to install anything on roof or projecting outside the window, but that did not stop me from experimenting with DIY antennas.

    Have fun.
    Thanks. You sound like you are living in the same building as me
    I've got 8m to the roof and there will be a great location, but no way I will get access to it and instal an antenna.
    I'm trying to launch the second location. On the roof at my workplace but at the moment I'm facing two challenges: lack of stable internet connection (weak WiFi signal on the roof) and my boss(not a big problem )

    Leave a comment:


  • abcd567
    replied
    matysldn

    Nice built.

    Experimenting with different types of DIY antennas is fun.

    I also live in a high rise building, surrounded by other high rise buildings, and I am not allowed to install anything on roof or projecting outside the window, but that did not stop me from experimenting with DIY antennas.

    Have fun.

    Leave a comment:


  • matysldn
    replied
    Originally posted by abcd567 View Post
    Nice looking drawings & designs.

    Have you built any of these? How was the performance?
    abcd567
    At the moment I built my hardware and software based on your posts. This is how it looks like:
    Picture no: 1 - Antenna, dipole 68mm arm, sorry for lack of focus.
    Picture no: 2 - RasPi case build by using cotton buds box
    Picture no: 3 - This is where I actually live. No open sky at all, high buildings around me, only one advantage is that my apartment is 35 meters above the ground and 200 above the sea level plus lots of busy airports around.

    With this configuration and location this is what I get:
    https://www.flightradar24.com/accoun...tats/?id=24016
    https://flightaware.com/adsb/stats/user/matysldn
    Picture from my dump1090

    And this is what I just build following instructions from the website. I haven't had time to test it yet.
    Slim Jim antenna 3/4 wl
    I will post here once i manage to install the antenna and test it.

    Leave a comment:


  • abcd567
    replied
    Originally posted by matysldn View Post
    Im not too sure if that was posted here but Im finding very useful antenna calculators on that web site. Looks like the owner of this website was(is) involved in 1090Mhz aswell
    https://jeroen.steeman.org/Antenna/A...gn-Calculators
    Nice looking drawings & designs.

    Have you built any of these? How was the performance?

    Leave a comment:


  • matysldn
    replied
    Im not too sure if that was posted here but Im finding very useful antenna calculators on that web site. Looks like the owner of this website was(is) involved in 1090Mhz aswell
    https://jeroen.steeman.org/Antenna/A...gn-Calculators

    Leave a comment:

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