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Raspberry Pi 3 B vs Raspberry Pi Zero W

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  • Raspberry Pi 3 B vs Raspberry Pi Zero W

    After replacing a Pi 3 B for feeding to FR24 by a Pi Zero W (location, antenna, FA pro stick, cables, homenet, internetconnection etc. everything unchanged)
    unfortunately my statistics concerning aircraft seen, max. distance, positions reported etc. went down significantly!

    Does someone here has an explanation for this or similar experience?

  • #2
    USB noise. Or different gain settings now

    Sent from my XT1092 using Tapatalk
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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    • #3
      Hi Oblivian

      USB noise could really be a factor because in order to connect the Pi Zero and the FA-stick I had to use a micro USB to normal USB pigtail adapter. IŽll oder a new one to test if that makes a difference.

      IŽm not familiar with gain settings. What is the background here?
      Last edited by majo; 2018-08-07, 08:26.

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      • #4
        check out this..

        https://forum.flightradar24.com/thre...highlight=gain
        Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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        • #5
          Actually, that one

          https://forum.flightradar24.com/thre...highlight=gain

          Has a guide to change and see if settings adjust
          Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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          • #6
            Originally posted by Oblivian View Post
            Wow, that opens a new level of adjustments for me. Thank you, IŽll try to work through step by step.

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            • #8
              The easiest way is to try different values of gain listed below, and for each gain setting, observe message rate, plane count etc for a while. Finally set the value which gives you best results.

              50, 45, 40, 35, 30, 25, 20

              The method to change/set gain depends on what decoder software you have installed. Examples are:
              • Pi24 image
              • PiAware image + fr24feeder
              • Raspbian image + dump1090 + fr24feeder
              • Raspbian image + dump1090-mutability + fr24feeder
              • Raspbian image + dump1090-fa + fr24feeder

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              • #9
                Thank you abcd567,

                do you suggest gainchanges just for the ordinary dvbt-usb-sticks or also for the FlightAware pro sticks?

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                • #10
                  Originally posted by majo View Post
                  do you suggest gain changes just for the ordinary dvbt-usb-sticks or also for the FlightAware pro sticks?
                  Due to high gain (18 dB) of built-in rf-amplifier of ProStick, the gain reduction/adjustment is more beneficial (rather necessary) for ProStick.

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                  • #11
                    My testing of the FlightAware Pro Plus stick is interrupted by this error:

                    pi@rpiz1:~ $ rtl_test -t
                    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.

                    Dump1090-mutability stopped:

                    pi@rpiz1:~ $ sudo service dump1090-mutability status
                    ● dump1090-mutability.service - LSB: dump1090 daemon (mutability variant)
                    Loaded: loaded (/etc/init.d/dump1090-mutability; generated; vendor preset: enabled)
                    Active: inactive (dead) since Thu 2018-08-09 02:43:17 CEST; 2min 57s ago
                    Docs: man:systemd-sysv-generator(8)
                    Process: 1078 ExecStop=/etc/init.d/dump1090-mutability stop (code=exited, status=0/SUCCESS)
                    Process: 216 ExecStart=/etc/init.d/dump1090-mutability start (code=exited, status=0/SUCCESS)

                    Aug 09 02:39:45 rpiz1 systemd[1]: Starting LSB: dump1090 daemon (mutability variant)...
                    Aug 09 02:40:04 rpiz1 dump1090-mutability[216]: Not starting dump1090-mutability daemon, disabled via /etc/default/dump1090-mu
                    Aug 09 02:40:04 rpiz1 systemd[1]: Started LSB: dump1090 daemon (mutability variant).
                    Aug 09 02:43:17 rpiz1 systemd[1]: Stopping LSB: dump1090 daemon (mutability variant)...
                    Aug 09 02:43:17 rpiz1 dump1090-mutability[1078]: start-stop-daemon: user 'dump1090' not found
                    Aug 09 02:43:17 rpiz1 systemd[1]: Stopped LSB: dump1090 daemon (mutability variant).


                    The stick even got some extra power via 3-element-OTG-cable.

                    Any ideas?

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                    • #12
                      First stop ALL feeders and decoders
                      Code:
                      sudo systemctl stop fr24feed
                      sudo systemctl stop piaware
                      sudo systemctl stop pfclient
                      
                      sudo systemctl stop dump1090-mutability
                      sudo systemctl stop dump1090-fa
                      sudo systemctl stop dump1090

                      Now test the dongle
                      Code:
                      rtl_test -t

                      After test is over, reboot Pi to normalize the system, decoder and feeders
                      Code:
                      sudo reboot
                      Last edited by abcd567; 2018-08-09, 01:21.

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                      • #13
                        Test worked after stopping feed AND dump:

                        pi@rpiz1:~ $ rtl_test -t
                        Found 1 device(s):
                        0: Realtek, RTL2832U, SN: 00001000

                        Using device 0: Generic RTL2832U
                        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.

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                        • #14
                          Then one of your setups is configured incorrect

                          Both will be trying to start it, So whatever gets it first will. And as soon as you stop the 1st the 2nd will take it.

                          Dump1090 should be the only thing configured for DVBT direct access
                          Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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                          • #15
                            Originally posted by Oblivian View Post
                            Then one of your setups is configured incorrect

                            Both will be trying to start it, So whatever gets it first will. And as soon as you stop the 1st the 2nd will take it.

                            Dump1090 should be the only thing configured for DVBT direct access
                            Configuration was mostly automatic.
                            After installing Raspbian (PI24-image did not work on my Pi Zero) and deactivation of IPv6 I used "sudo bash -c "$(wget -O - http://repo.feed.flightradar24.com/install_fr24_rpi.sh)".
                            One abnormalty during installation was a message roughly like "There was no dump1090 found but after first start of fr24feed it will be installed automatically".

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