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  • Dump1090 Mutability v1.14

    I have some confusion in my FR24 settings screen I have the lat and long arguments set and when viewing Dump1090 on my local IP it has range rings and my location and distance from a/c shown.

    Capture.PNG

    However if I go to sudo nano /etc/default/dump1090-mutability it shows:

    # If set, supplies a reference location for local position decoding.
    LAT=""
    LON=""

    I actually want to change the Gain setting from max to a lower value, but if I change this in the same file I get told the file is read only ?
    I have tried adding --gain="40" to the FR24 setting screen but it refuses the changes as well.

    Is there another file that FR24 uses instead ?

    Sorry abcd567 I know I have been here before with similar problems

    Millsey.
    T-EGMC14 -- RTL2832U / R820T+ Raspberry Pi + Dump1090 with home made 8 element colinear 12m above ground level.

  • #2
    Think FR24 runs a live config parameter or PROC_ARGS in its own launching script from setup.

    And shouldn't be an = or " sign used for additional command

    --gain 40
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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    • #3
      Thanks Oblivian,

      After rebooting it accepts the settings, before rebooting still said "read only" and wouldn't change. Odd this, have encountered this before.

      Cannot understand why if I split the antenna feed to the Dump1090 SDR I see 700 msgs / sec and on RTL1090 SDR I get over 2000 msg / sec and 15-20 more A/C as well ?

      I thought I was overloading the Dump1090 SDR, but this is obviously not the case ? so I have removed the --gain 40 line and am I correct in assuming it will now reset to max ?
      addendum after post - (must do as --gain max totally stopped it receiving anything !!)

      I have a LN4ALL pre-amp feeding them through a MiniCircuits 1090 filter at present, at the SDR end of the coax, not at the mast.

      Millsey
      Last edited by milair; 2018-04-30, 11:25.
      T-EGMC14 -- RTL2832U / R820T+ Raspberry Pi + Dump1090 with home made 8 element colinear 12m above ground level.

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      • #4
        40.2 is the correct step. And can be minipulated by the front end gain too

        -10 is reported as Auto/AGC

        How To Test If Your DVB-T RTL SDR Dongle Is Healthy Following two options are described below: OPTION-1: Dongle plugged into Raspberry Pi. OPTION-2: Dongle plugged into Windows Computer. . OPTION-1: Dongle plugged into Raspberry Pi. STEP-1: Install the test tools package rtl-sdr sudo apt-get update sudo apt-get install


        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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        • #5
          @Mellsey
          If you want to use Gain="max"

          (1) Remove gain entry (--gain xx) from FR24 Screen (ip-of-pi:8754/settings.html) and save changes by clicking "Save" button.

          (2) Set Gain="max" in file /etc/default/dump1090-mutability.

          (3) Reboot Pi and check by following command:
          Code:
          sudo systemctl status dump1090-mutability -l
          Gain value in use will be displayed inside the output
          Last edited by abcd567; 2018-04-30, 21:14.

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          • #6
            The order of precedence is like this:

            (1) FR24 feeder first looks to the file /etc/fr24feed.ini (same values as displayed on FR24 Screen ip-of-pi:8754/settings.html).

            If it finds a process argument entry there, it starts dump1090-mutability with those parameters.

            (2) If FR24 feeder does not find a parameter in file fr24feed.ini, It starts dump1090-mutability using that parameter in file /etc/default/dump1090-mutability.

            (3) If the any item of process arguments is missing in the file /etc/default/dump1090-mutability, then FR24 starts dump1090-mutability with dump1090-mutability's default value for the missing parameter.
            Last edited by abcd567; 2018-04-30, 21:43.

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            • #7
              @abcd567

              Thanks for the info on order of precedence, makes more sense now
              Still have this weird "read only" problem when trying to edit files using sudo nano, but if I reboot it allows me to edit ok. If I try again the next day it has reverted to read only.

              As the feeds are working fine I'll leave well alone now methinks.

              Millsey
              T-EGMC14 -- RTL2832U / R820T+ Raspberry Pi + Dump1090 with home made 8 element colinear 12m above ground level.

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              • #8
                @Millsey:

                This should solve your "read only" problem for both these files
                Code:
                sudo chmod a+rwx /etc/fr24feed.ini
                
                sudo chmod a+rwx /etc/default/dump1090-mutability

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                • #9
                  Originally posted by abcd567 View Post
                  @Millsey:

                  This should solve your "read only" problem for both these files
                  Code:
                  sudo chmod a+rwx /etc/fr24feed.ini
                  
                  sudo chmod a+rwx /etc/default/dump1090-mutability
                  Cheers for that, I'll give it a go at the weekend
                  T-EGMC14 -- RTL2832U / R820T+ Raspberry Pi + Dump1090 with home made 8 element colinear 12m above ground level.

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