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Thread: best antenna

  1. #2731
    Captain abcd567's Avatar
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    Quote Originally Posted by mem0tap View Post
    Despite designing my own antennas I'm not an antenna expert, nobody is, it's a black art, guided by experience and a few rule of thumb calculations. I reckon for every successful antenna there's a few dozen in the bin!
    Fully agree

  2. #2732
    Captain abcd567's Avatar
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    Below are the simulation results for a CoCo (8-Elements, made of coax VF=0.86).
    These results show how a 1 or 2 mm error in element length can grossly affect SWR and Radiation pattern.
    Gain is relatively less affected by 1 or 2 mm error.

    The error in element length can either due to using wrong VF, or wrong cutting or a combination of both.

    In this simulation the a VF of 0.86 was used, giving element length 118 mm.


    SWR vs Element Length




    Gain vs Element Length




    Radiation Pattern vs Element Length





  3. #2733
    Purser Rooster's Avatar
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    Quote Originally Posted by abcd567 View Post
    Rooster:
    Attachment 9675 Attachment 9675 Attachment 9675
    Fully agree with you.

    Glad to see you after a long gap. Welcome back.
    Thanks mate - keep lurking, but not a lot has happened on here :-(

  4. #2734
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    Screenshot from 2018-07-20 23-06-53.png - results of my 'new' waterpipe antenna. fitted around midday Tuesday, it's mounted 7 feet below Jetvision antenna (which yields around 2400 a day, Since it looks promising I've upped the anti a touch and building an 8 section 22mm outer, 8.5mm inner air spaced.

  5. #2735
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    Got up on the roof today and relocated the FR24 antenna from its previous location on the side fence to above the TV antenna... now sitting about 1.2m above the highest point of the roof-line...
    (also solved a TV reception issue)
    FR24 antenna on roof.jpg

    (shot of previous location in this post https://forum.flightradar24.com/thre...l=1#post105113)
    Last edited by petercr; 2018-08-04 at 07:15.

  6. #2736
    Captain abcd567's Avatar
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    Horseshoe Antenna

    Found a very interesting horseshoe antenna made by galenthurber.
    Please see this thread


  7. #2737
    Captain abcd567's Avatar
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    SIMULATION OF HORSESHOE ANTENNA


    Gain = 3.2
    SWR = 3.5







  8. #2738
    Captain abcd567's Avatar
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    IMPEDANCE MATCHING STUB ADDED TO HORSESHOE ANTENNA

    Untested proposal. Expected to bring down SWR from 3.5 down to < 1.5


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