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  • #16
    Pi24 image has been updated and should support 3b+ now. Also, by default its starts with "-- gain -10" and no max as the previous version did. As Oblivion, abcd567 and Ressy mentioned/showed previously that if you see any changes in the range, you can play around with gain settings to see if that makes things better.
    --

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    • #17
      Amended my 3b+ warnings out again.

      Abcd567 will no doubt do similar.

      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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      • #18
        Originally posted by Khan View Post
        ...you can play around with gain settings to see if that makes things better.
        Yes, for me "-10" is almost the worst option! Averaging each gain twice over 90 seconds and then taking the percentage of the highest result so it's easier to plot everything on the same graph I get:

        d-table.png

        d-graph.png

        I thought I'd read somewhere that the -10 / AGC option was designed to work at TV frequencies rather than 1090MHz?

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        • #19
          Originally posted by elljay View Post
          I thought I'd read somewhere that the -10 / AGC option was designed to work at TV frequencies rather than 1090MHz?
          That is right. The dongle is designed for TV, and NOT for ADSB ( DVBT = Digital Video Broadcast, Terestrial).


          Please see following two posts on page #6 of the thread How to Install dump1090-mutability_1.15~dev on RPi


          (1) Dump1090-mutability: About gain -10


          (2) ABOUT AGC


          .
          Last edited by abcd567; 2018-10-29, 16:19.

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          • #20
            Originally posted by elljay View Post
            Yes, for me "-10" is almost the worst option! Averaging each gain twice over 90 seconds and then taking the percentage of the highest result so it's easier to plot everything on the same graph I get:

            [ATTACH=CONFIG]9838[/ATTACH]

            [ATTACH=CONFIG]9839[/ATTACH]

            I thought I'd read somewhere that the -10 / AGC option was designed to work at TV frequencies rather than 1090MHz?
            The same dongle performs differently, on linux pc's, 2 of them, plus a linux laptop, all different brands, work best on max gain, but rpi works best on -10 unline teh real pc's. Something in the rpi I guess.

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