Results 1 to 6 of 6

Thread: Better Range.

  1. #1
    Passenger
    Join Date
    Sep 2019
    Posts
    2

    Better Range.

    Hello!

    I'm from Brazil and set up a receiver for Flightradar using a Raspberry Pi! I tried to leave as organized as possible according to the photos I have attached and to complement I installed an Active High Performance ADS-B Antenna 1090 MHz with 2.5 dBi gain; LNA amplifier, ca. 21 dB gain ... But I think my range is very weak .. I have the maximum range at 219nm and the antenna is installed at the top of my apartment over 50 meters high and in a region not too close to mountains .. Did I do something wrong or not get a better range?
    Attached Images Attached Images

  2. #2
    First officer
    Join Date
    Dec 2014
    Posts
    229
    The first basic check I'd make is to see what the range is without the amplifier. That will help determine what to do next.

  3. #3
    Captain abcd567's Avatar
    Join Date
    Sep 2013
    Location
    Toronto CYYZ
    Posts
    2,863

  4. #4
    Captain
    Join Date
    Apr 2018
    Posts
    870
    "Active High Performance ADS-B Antenna 1090 MHz with 2.5 dBi gain"

    So if it's really an active antenna, it has an LNA built in.
    Using another LNA will then stop power going to the LNA in the antenna and the LNA in the antenna will block the signal.

    Can you more clearly show which items you bought?

    Also make clear how you arranged the items, in particular what the device is directly below the antenna.
    Last edited by wiedehopf; 2019-09-30 at 07:07.

  5. #5
    Passenger
    Join Date
    Sep 2019
    Posts
    2
    Sure, I bought aa Kit from Jetvision.de called Active Diapason Antenna, this bundle contains the "Active Diapason" ADS-B Antenna (1090 MHz) and the 20 m Antenna Cable incl. accessories as Bias Tee, USB cable and mounting!

    I installed all the equipment as indicated by them and below the antenna I have only one Type Female Bulkhead to SMA Plug Male Cable adapter and the Bias Tee ... The Bias Tee is used to provide DC power into an antenna cable without interfering the existing RF path..

  6. #6
    Captain
    Join Date
    Apr 2018
    Posts
    870
    You can remove the power from the bias-t to confirm that the amplifier is indeed getting power.
    (reception should be much worse when you remove power from the bias-t)

    Are you sure it's 30m above ground? How many stories is it?

    If you are still running the original dump1090 that comes with the pi24 image, you can try this:
    https://github.com/wiedehopf/adsb-sc...for-dump1090fa

    Be sure to configure the location as described.

    Get the graphs as well: https://github.com/wiedehopf/graphs1090#graphs1090

    The signal level graph and message rate graph plus the range graph might be interesting.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •