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Thread: Antenna type

  1. #11
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    I will post my diagram once i come back from london sir


    Sent from my iPhone using Tapatalk

  2. #12
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    i reinstalled my raspberry with dump1090mu and with same antenna im getting some planes up to 100nm

    aviones.png

  3. #13
    Captain abcd567's Avatar
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    Quote Originally Posted by dedicados View Post
    i reinstalled my raspberry with dump1090mu and with same antenna im getting some planes up to 100nm

    aviones.png
    You have already improved your antennajs groundplane by placing it over a metallic dish. Now improve it further by chopping its whip like shown in drawing below, and your range will increase further.


    Also see this post:

    http://forum.flightradar24.com/threa...-Whip-Antennas



  4. #14
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    Awesome abcd567! i will do it today arriving home.

    and about 978Mhz planes, how to get them?

  5. #15
    Captain abcd567's Avatar
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    978 mhz transmission is only in usa. If you are not in usa, you dont have any planes transmitting on 978 mhz.

    In usa, you have to install dump978 to receive it, but traffic is very low and you get very few planes, that also after a long wait.
    Last edited by abcd567; 2016-05-27 at 14:53.

  6. #16
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    good to know, thank you.

    i will do test later at home with the cutted antenna

  7. #17
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    well i cut the antenna but i dont see to much difference, i will leave it just like that.

    i see many more mlat but no one shows on my dump1090 =(

    ModeS: A013C0 Callsign: N/A
    Lat: N/A
    Long: N/A
    Alt: 28000ft
    SQW: 1775

    ModeS: A4B21B Callsign: N/A
    Lat: N/A
    Long: N/A
    Alt: 35000ft
    SQW: 4571

    ModeS: A52A9B Callsign: N/A
    Lat: N/A
    Long: N/A
    Alt: 27850ft
    SQW: 0000

    ModeS: A7CEE0 Callsign: N/A
    Lat: N/A
    Long: N/A
    Alt: 4700ft
    SQW: 0000

    ModeS: AA1F65 Callsign: N/A
    Lat: N/A
    Long: N/A
    Alt: 40975ft
    SQW: 0000

    just appeared one Distance from Site: 103.2 NM / 191.1 km

    this is how i have the antenna right now, dont laught!

    antena.jpg

    should i use a can? or move the antenna to another side?

  8. #18
    Captain abcd567's Avatar
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    Quote Originally Posted by dedicados View Post

    antena.jpg

    should i use a can? or move the antenna to another side?
    Try both. First add a can, then move the antenna+can.

    Keep the chopped whip. It definately performs better than the original full length whip, although you may not notice the difference without tools like graphs I have used.

    Antennas are a bit unpredictable. Only trying different things will show what is best.

    What is the length of coax from antenna to dvb-t dongle? Adding an amplifier greately improves reception in most cases.
    Last edited by abcd567; 2016-05-27 at 21:20.

  9. #19
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    no coaxial, i have the USB behind the SKY antenna, and a usb to my raspberry pi

    right now i have this


    avioness.png

    for the time of the post the farest is

    Distance from Site: 120.2 NM / 222.6 km

  10. #20
    Captain abcd567's Avatar
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    The 120NM maximum range is too low for an outdior roof mounted antenna with less than a meter coax.

    First check what is the maximum range you can get from your location and antenna height from the step-by-step method I have posted:

    What is the Maximum Range I can Get?

    .

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