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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?

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