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3 EASY ANTENNAS FOR BEGINNERS

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  • AlejandroM
    replied
    Hello! cantenna worked for me, but with the FA filter, i will test with other options.

    thank you for all abcd567

    Leave a comment:


  • magnum
    replied
    For testing purposes if it's really worth spending the time i created today my own Spider based on the option #3 keeping it cheap and simple.

    Below is a picture of the antenna. Please do not laugh, it looks like made of a three year old kid

    But it works!
    The aircraft rate is constantly above 100 now over the day which is an increase of approx 10-20%

    In detail, you can easily identify the moment where i connected the antenna:

    spider1.jpg
    spider3.jpg

    and the beauty itself
    spider2.jpg

    Now it's the time for doing a more professional version.

    Thanks to abcd567 for your suggestions and tutorials!

    Leave a comment:


  • kkomarica
    replied
    Since here is a lot of talk about spider antennas I hope that someone can help me with a practical question.
    Is there any drawback (or maybe advantage) if I mount a spider antenna (built around a uhf chassis connector) to a metal pole? Ground part of the antenna would be in contact with the pole.

    Has anyone done any testing conductive pole vs a non-conductive pole?

    Leave a comment:


  • Faddah
    replied
    I wonder what would happen if I'd add a spider at the last (highest) segment of coco. Anyone tested this?

    Leave a comment:


  • ylis
    replied
    Ahhh !!! I doff me cap to your wisdom and wit ..............

    Leave a comment:


  • abcd567
    replied
    @ylis:
    8 legs for spiders is nature's choice

    spider 8 legs.jpg spider 8 leg - 2.jpg spider 8 leg -3.jpg spider 8 leg -4.jpg
    Last edited by abcd567; 2018-04-22, 22:29.

    Leave a comment:


  • Faddah
    replied
    I'm currently testing my 9 segment coco vs 8 leg spider. For my location (I live on the 4th storey) I've about 35 readings per plane using coco, 31 using spider. When I lifted my spider one storey up I reached the number readings as in the coco placed one storey lower. Tomorrow I will test the coco lifted one level up

    Leave a comment:


  • abcd567
    replied
    Originally posted by ylis View Post
    In summary - not much difference at all using 4 or 8 radials .... or have I misread something ?
    (1) You read the simulation results right, but this little difference of gain (about 0.25 dB) may help in picking planes at the outer reach whose signal strength is marginal.

    (2) The real test is to make a Spider with 4 radials, observe for some period the message rate, plane count, maximum distance, then add 4 radials to make it 8 radials, and observe for some periods the message eate, plane count, maximum distance. This will show the real-world difference. Most hobbyists have reported 10% to 20% improvement when switched from 4 radials to 8 radials.

    Leave a comment:


  • ylis
    replied
    Thank you abcd567

    In summary - not much difference at all using 4 or 8 radials .... or have I misread something ?

    Leave a comment:


  • abcd567
    replied
    @ylis:


    Spider 4 radials






    Spider 8 radials

    Leave a comment:


  • ylis
    replied
    Can anyone explain - in simple terms - the differences between having 3 -4 - 6 or 8 radials. I've seen examples of all these and would assume 8 is best but does this affect the operation ?

    Leave a comment:


  • abcd567
    replied
    Originally posted by Faddah View Post
    Hi there!
    Is power inserter the same as power/voltage separator as I can't find "power inserter" analogue here in Poland.
    Yes, it is same.
    This one (ASZ-03R) is OK if you want to use one receiver (DVB-T) with one antenna
    9e7061014cd8b3e0c0b0bb1ccfd1.jpeg
    ww.JPEG

    This one (ASZ-04/2) is OK if you want to use two receivers (DVB-T) with one antenna. If you connect two receivers (DVB-T), the signal will be divided between the two, and each will get half the strength.
    ww2.JPEG

    Leave a comment:


  • Faddah
    replied
    Hi there!
    Is power inserter the same as power/voltage separator as I can't find "power inserter" analogue here in Poland.
    9e7061014cd8b3e0c0b0bb1ccfd1.jpeg
    ww.JPEG
    or something like this:
    ww2.JPEG

    thanks for help!

    Leave a comment:


  • abcd567
    replied
    @RIN67630:
    Your statistics with J Pole antenna are great, congratulations!
    What were your statistics with 1/4 λ groundplane antenna?

    A comparison of two statistic will quantitatively highlight the difference of J Pole and 1/4 λ groundplane antennas.

    Leave a comment:


  • RIN67630
    replied
    Originally posted by SpaxmoidJAm View Post
    careful this is turning into a not so easy antenna thread.
    My words. The Jpole is the easiest. It fits in a piece of 16mm PVC tube.
    Forget amplifiers, forget expensive coax cables and connectors, adapters etc...

    The trick is to use the short stock cable and place receiver and Pi close to the antenna.

    I get ~280nM every day and my current antenna location is far from being perfect, it is still not above the roofes around.

    T-EDLW40 Statistics (from an average day):
    STATUS: Online CURRENT UPLOAD RATE: 0 KB/S FIRST SEEN ONLINE: 2016-01-03 22:59:14
    LOCAL IP: N/A MAC ADDRESS: 00:00:00:00:00 COORDINATES: 51.3684,7.9404
    UPTIME (AS % OF AVAILABLE TIME): 100% AIRCRAFT SEEN: 1,788 POSITIONS REPORTED: 84,496
    MAXIMUM DISTANCE: 286nm
    Last edited by RIN67630; 2016-04-02, 03:01.

    Leave a comment:

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