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Thread: Raspberry Pi 3 B+ and USB Dongle R820T2 no flights recognized

  1. #11
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    And thank you Oblivian for unlocking the posts

  2. #12
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    I used the manual provided by Flightradar24:
    Download Pi24 Image (ZIP, GZIP, MD5)
    Download and unzip the file.
    Download Etcher and follow the instructions given on the page.

    I installed the image with etcher.

    The antenna is three meters away from the raspberry and outside (dry place).

    Thank you. Now I was able to do the test. The result seams fine:

    pi@raspberrypi:~ $ rtl_test -t
    Found 1 device(s):
    0: Realtek, RTL2838UHIDIR, SN: 00000001

    Using device 0: Generic RTL2832U OEM
    Found Rafael Micro R820T tuner
    Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
    [R82XX] PLL not locked!
    Sampling at 2048000 S/s.
    No E4000 tuner found, aborting.
    Last edited by Nomax2000; 2019-04-10 at 17:01.

  3. #13
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    Quote Originally Posted by Nomax2000 View Post
    The antenna is three meters away from the raspberry and outside (dry place).
    .
    As i said check the thread on improving the antenna.

    Normally there should be at least a couple of aircraft visible but if there is a lot of electrical noise or the antenna is blocked from the aircraft by hills or metal of any kind there is the possibility of receiving nothing.

    I also don't know where you are located and how many planes pass by.

    (After doing the tests you will have to start fr24feed again so that it is running: sudo systemctl restart fr24feed )

  4. #14
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    I am in Addis Ababa with view on the landing planes. There shall be many planes. If I see them, I also should get the data.

    I checked the thread on improving the antenna and shortened it.

  5. #15
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    Quote Originally Posted by Nomax2000 View Post
    pi@raspberrypi:~ $ sudo apt-get install rtl-sdr

    W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.YAGcKX - IsAccessibleBySandboxUser (30: Read-only file system)
    W: Problem unlinking the file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - PrepareFiles (30: Read-only file system)
    E: Failed to fetch .raspberrypi.org/debian/pool/main/r/rtl-sdr/rtl-sdr_0.5.3-11+rpt1_armhf.deb Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
    E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
    I have now updated the post "Is My DVB-T RTL SDR Dongle Healthy? " and added command "sudo mount -o remount ,rw /" to make file system "read and write", with a note to use this command for PI24 image.

  6. #16
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    If you can see them then you should be receiving them easily.

    If your dongle had an SMA connector and not MCX you could just use a piece of wire about 6.8 cm long and place it into the dongle.
    With the MCX connector it's not easy to exclude the possibility of the antenna cable not being connected to the antenna anymore (internally).
    (But the antenna is new and probably intact)

    Does this aircraft list at least work for you (replace the IP address with that of you RPi)
    http://192.168.1.55/dump1090/

    The map can be changed like this: https://forum.flightradar24.com/thre...uot-Water-Mark
    @abcd567 that thread can probably also use the remount command

    Which power supply are you using for the RPi?
    Maybe just try a different one, a phone charger with USB output for example.
    Sometimes the USB receiver doesn't work properly with a weak power supply.
    Last edited by wiedehopf; 2019-04-10 at 17:58.

  7. #17
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    Yes, the list is working but empty.
    It was a complete package for the raspberry pi 3 b+ with an 3A power supply.

    Is the direction of the antenna important?

  8. #18
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    The tip needs to point up. Also the further the antenna can "look" the better. So having it on a roof or an elevated position is very beneficial.

    Can you check flightradar24 if there are even close by aircraft at the moment?
    Last edited by wiedehopf; 2019-04-10 at 18:18.

  9. #19
    Captain abcd567's Avatar
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    Quote Originally Posted by wiedehopf View Post
    If you can see them then you should be receiving them easily.
    The map can be changed like this: https://forum.flightradar24.com/thre...uot-Water-Mark
    @abcd567 that thread can probably also use the remount command
    I dont understand the logic of FR24 developers who made PI24 file system "read-only".

    Thanks for suggesting inclusion of mount/remount command in Map thread.
    Since this problem has became known to me before I created the Map post in February 2019, I ensured to included mount/remount command (Step-2).

  10. #20
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    I changed my setup. The raspberry is now quite far away from other electronic devices. Unfortunately the cable of the antenna isn't long enough to put it on the roof. I will try some different locations. But the changes will be small.

    Right now there are some planes on the ground and one is 100km away.

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