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  • sbnf
    replied
    I´ll try moving the antenna to the north face, it will be about 10 ft from the tv antenna so I can run another test.
    Apart that, the one thing was changed is the power outlet from another circuit breaker. But it´s hardly the problem. Just thinking outside the box rsrs. Just in case, I´ll try with an extension cord tomorrow.1090.jpg880.jpg

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  • abcd567
    replied
    Originally posted by sbnf View Post
    There it is
    [ATTACH=CONFIG]11133[/ATTACH]
    Here are cut-out pieces

    Scan part1.jpg

    Scan part2.jpg

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  • wiedehopf
    replied
    Somehow you uploaded a very small version.
    No matter, it looks very much like interference is the problem indeed.

    Let's try this:
    dump1090-fa-gain 29.7

    This will reduce the gain, maybe you'll receive at least a few aircraft that way.

    In regards to filters, you have a couple of options.
    There are filters by FA, those might work (the dark blue is better than the light blue filter).

    You can try your luck with one of the filters on ebay:




    The first 2 above would require a male to male SMA adapter to connect them.
    I have no experience in regards to the quality of these filters, but if they do what they say they do, they should work for you.

    You could also get one of the filtered amplifiers https://www.rtl-sdr.com/new-product-...mhz-ads-b-lna/
    But that requires a bias-t to supply it with power as well.

    And last:
    Maybe by mounting the antenna in a different position or moving the RPi you can avoid the interference?
    Could you make a photo of where it's mounted on the antenna?
    If the FA antenna is mounted above everything else you have better chances of avoiding the interference.
    Last edited by wiedehopf; 2019-10-02, 21:58.

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  • sbnf
    replied
    There it is
    scan.jpg

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  • sbnf
    replied
    i had stoped the wrong one.
    I did
    sudo systemctl stop fr24feed
    running it now.

    thanks

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  • wiedehopf
    replied
    That error occurs if dump1090-fa is still running.

    Did you stop it as instructed?

    If you did, maybe the blacklisting isn't working, try this:
    Code:
    echo -e 'blacklist rtl2832\nblacklist dvb_usb_rtl28xxu\nblacklist rtl8192cu\nblacklist rtl8xxxu\n' | sudo tee /etc/modprobe.d/blacklist-rtl-sdr2.conf
    sudo reboot
    Then try again:
    sudo systemctl stop dump1090-fa

    and then the command to record the spectrum


    Looking at the graphs it could indeed be that you have a problem with strong interference.
    But the spectrum will show that better.
    Last edited by wiedehopf; 2019-10-02, 20:33.

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  • sbnf
    replied
    got an error

    Number of frequency hops: 286
    Dongle bandwidth: 2797202Hz
    Downsampling by: 1x
    Cropping by: 50.00%
    Total FFT bins: 9152
    Logged FFT bins: 4576
    FFT bin size: 87412.56Hz
    Buffer size: 16384 bytes (2.93ms)
    Reporting every 30 seconds
    Found 1 device(s):
    0: Realtek, RTL2832U, SN: 00001000

    Using device 0: Generic RTL2832U
    usb_claim_interface error -6
    Failed to open rtlsdr device #0.
    pi@raspberrypi:~ $

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  • sbnf
    replied
    Just checked connections of the dongle and the antenna and they are all OK.
    I got this screen on graphs
    fr1090a.jpg
    fr1090b.jpg

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  • wiedehopf
    replied
    Hmm, it could be that one of the connections is loose?

    If you want, you can run a spectrum scan, that should show if it's very strong interference or a loose connection
    The space around ADS-B antenna contain not only 1090 MHz signals, but also lot of other signals at different frequencies. The closer the frequency of a signal to 1090 MHz, your ADS-B antenna picks it stronger. For example if there are three signals of equal strength, one at 144 MHz, 2nd at 850 MHz and 3rd at 950 MHz, the ADS-B


    (The TV antenna itself should not be a problem, but if there is a bad amplifier or something else there, it could be interference.)
    Last edited by wiedehopf; 2019-10-02, 19:19.

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  • sbnf
    replied
    Captain wiedehopf
    graphs working now. In blank but working.
    nothing on tar1090.

    I'll leave a few minutes and will check it back soon.

    So far, thanks a lot!

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  • sbnf
    replied
    Originally posted by wiedehopf View Post
    After installing dump1090-fa as shown in the previous post, you can check the log for that, it's much easier to handle than the fr24feed log.

    The log for that:
    sudo journalctl --no-pager -u dump1090-fa

    Otherwise the easiest way to check the fr24feed log is actually:
    sudo systemctl stop fr24feed
    sudo fr24feed

    It will now run on the console and you can see the log.
    If you are done, you'll need to stop it and restart the service:
    Ctrl-C to interrupt
    sudo systemctl restart fr24feed

    Obviously this isn't a permanent solution to check the logs, but it might show if the problem appears immediately.

    Might be a power supply problem if the dongle stopped working, can you try another power supply?
    Is the dongle plugged in directly? You can try another USB port.
    yes, it s plugged in directly.
    Changed ports and the same.

    Ill get a new power supply for testing purpose.

    Leave a comment:


  • wiedehopf
    replied
    Looks good, do you have aircraft on the local map?



    As i said if you re-run the graphs install, that should work now as well.

    Leave a comment:


  • sbnf
    replied
    sudo journalctl --no-pager -u dump1090-fa
    -- Logs begin at Thu 2019-02-14 08:11:59 -02, end at Wed 2019-10-02 15:46:44 -03. --
    out 02 15:37:38 raspberrypi systemd[1]: Started dump1090 ADS-B receiver (FlightAware customization).
    out 02 15:37:38 raspberrypi dump1090-fa[6122]: Wed Oct 2 15:37:38 2019 -03 dump1090-fa 3.7.2 starting up.
    out 02 15:37:38 raspberrypi dump1090-fa[6122]: rtlsdr: using device #0: Generic RTL2832U (Realtek, RTL2832U, SN 00001000)
    out 02 15:37:38 raspberrypi dump1090-fa[6122]: Found Rafael Micro R820T tuner
    out 02 15:37:38 raspberrypi dump1090-fa[6122]: rtlsdr: enabling tuner AGC
    out 02 15:37:38 raspberrypi dump1090-fa[6122]: Allocating 4 zero-copy buffers
    out 02 15:38:04 raspberrypi dump1090-fa[6122]: Wed Oct 2 15:38:04 2019 -03 Caught SIGTERM, shutting down..
    out 02 15:38:04 raspberrypi systemd[1]: Stopping dump1090 ADS-B receiver (FlightAware customization)...
    out 02 15:38:04 raspberrypi dump1090-fa[6122]: Wed Oct 2 15:38:04 2019 -03 Waiting for receive thread termination
    out 02 15:38:05 raspberrypi dump1090-fa[6122]: Wed Oct 2 15:38:05 2019 -03 Normal exit.
    out 02 15:38:05 raspberrypi systemd[1]: dump1090-fa.service: Succeeded.
    out 02 15:38:05 raspberrypi systemd[1]: Stopped dump1090 ADS-B receiver (FlightAware customization).
    out 02 15:38:05 raspberrypi systemd[1]: Started dump1090 ADS-B receiver (FlightAware customization).
    out 02 15:38:05 raspberrypi dump1090-fa[6614]: Wed Oct 2 15:38:05 2019 -03 dump1090-fa 3.7.2 starting up.
    out 02 15:38:05 raspberrypi dump1090-fa[6614]: rtlsdr: using device #0: Generic RTL2832U (Realtek, RTL2832U, SN 00001000)
    out 02 15:38:05 raspberrypi dump1090-fa[6614]: Found Rafael Micro R820T tuner
    out 02 15:38:06 raspberrypi dump1090-fa[6614]: rtlsdr: enabling tuner AGC
    out 02 15:38:06 raspberrypi dump1090-fa[6614]: Allocating 4 zero-copy buffers
    out 02 15:39:57 raspberrypi dump1090-fa[6614]: Wed Oct 2 15:39:57 2019 -03 Caught SIGTERM, shutting down..
    out 02 15:39:57 raspberrypi systemd[1]: Stopping dump1090 ADS-B receiver (FlightAware customization)...
    out 02 15:39:57 raspberrypi dump1090-fa[6614]: Wed Oct 2 15:39:57 2019 -03 Waiting for receive thread termination
    out 02 15:39:58 raspberrypi dump1090-fa[6614]: Wed Oct 2 15:39:58 2019 -03 Normal exit.
    out 02 15:39:58 raspberrypi systemd[1]: dump1090-fa.service: Succeeded.
    out 02 15:39:58 raspberrypi systemd[1]: Stopped dump1090 ADS-B receiver (FlightAware customization).
    out 02 15:39:58 raspberrypi systemd[1]: Started dump1090 ADS-B receiver (FlightAware customization).
    out 02 15:39:58 raspberrypi dump1090-fa[7901]: Wed Oct 2 15:39:58 2019 -03 dump1090-fa 3.7.2 starting up.
    out 02 15:39:58 raspberrypi dump1090-fa[7901]: rtlsdr: using device #0: Generic RTL2832U (Realtek, RTL2832U, SN 00001000)
    out 02 15:39:59 raspberrypi dump1090-fa[7901]: Found Rafael Micro R820T tuner
    out 02 15:39:59 raspberrypi dump1090-fa[7901]: rtlsdr: enabling tuner AGC
    out 02 15:39:59 raspberrypi dump1090-fa[7901]: Allocating 4 zero-copy buffers

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  • sbnf
    replied
    got this installing as requested

    sed: não foi possível abrir o arquivo temporário /etc/default/sedB3691K: Permissão negada
    sed: não foi possível abrir o arquivo temporário /etc/default/sedBIixaK: Permissão negada

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  • wiedehopf
    replied
    If you get the graphs going as suggested, it'll be much easier to see where the issue is.

    Just guessing won't help.

    Leave a comment:

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