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Thread: 3 EASY ANTENNAS FOR BEGINNERS

  1. #121
    Captain abcd567's Avatar
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    @ylis:


    Spider 4 radials






    Spider 8 radials


  2. #122
    Purser
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    Thank you abcd567

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

    ylis

  3. #123
    Captain abcd567's Avatar
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    Quote 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.

  4. #124
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    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
    T-EPLL59

  5. #125
    Captain abcd567's Avatar
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    @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 at 22:29.

  6. #126
    Purser
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    Ahhh !!! I doff me cap to your wisdom and wit ..............

    ylis

  7. #127
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    I wonder what would happen if I'd add a spider at the last (highest) segment of coco. Anyone tested this?
    T-EPLL59

  8. #128
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    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?

  9. #129
    Flight attendant magnum's Avatar
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    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!

  10. #130
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    Hello! cantenna worked for me, but with the FA filter, i will test with other options.

    thank you for all abcd567

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