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Thread: How do I adjust the gain the right way

  1. #1
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    How do I adjust the gain the right way

    So today I've switched from the generic USB dongle to prostick plus with fa filter and wow it made a huge difference, I've already turned down the gain to 40 as it was mentioned I would have to turn it down.

    My question is how do I determine exactly where the gain should be? I tried to search but the only thing I find are for piaware users that have a formula they get with numbers from their logs which apparently I can't access in the fr24 install.

    Right now, if it means anything, only about half the aircrafts tracked are uploaded according to the 8754 status page, and I have the gain set for 40

  2. #2
    Captain abcd567's Avatar
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    If you install dump1090-mutability, it has the capability to show message rate. You can also install prerformance graphs, so that you can monitor graphically.

    However installation of dump1090-mutability on Pi24 image is not straight forward, and needs workarounds.

    If you write on microSD card, the Respbian Jessie Lite image (download from http://raspberrypi.org/downloads/raspbian ), you can then install dump1090-mutability and FR24 data feeder without any complication and workaround.

    Please see this thread:

    How to Install dump1090-mutability_1.15~dev on RPi



    .
    Last edited by abcd567; 2017-07-07 at 21:52.

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    I'm not sure what happened to my reply

    Thank you for that answer, I was trying to avoid doing that as I have no experience in it at all but I guess I'll have to try it after all

    Do I reuse the same sharing code I already received from fr24?

    Thank you again

  4. #4
    Captain abcd567's Avatar
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    Quote Originally Posted by 71sbeetle View Post
    I'm not sure what happened to my reply

    Thank you for that answer, I was trying to avoid doing that as I have no experience in it at all but I guess I'll have to try it after all
    Linux in the begining looks very difficult, but as you go through it, becomes easy.

    In order to avoid typing mistakes, copy-paste commands from the thread, one command at a time.

    Take care not to omit any step. To check what was your last step, press arrow-up key, then after checking, press arrow-down key to go back to command prompt.

    Note:
    (1) After writing Raspbian Jessie to your microSD card, dont remove it from your desktop/laptop. First in File Explorer, click the drive letter of microSD card to open the folder. Right click in this folder and create a blank text file named SSH or SSH.txt. Without this file, SSH will not be enabled. After createing this file, remove microSD card from your desktop/laptop, insert into Pi, and power up. Now you can SSH into Pi from your desktop/laptop. You will need to install SSH software called PuTTY if using Windows computer. In Mac, the command console is capable to SSH, and you dont need to install any SSH software

    (2) To make things simpler, omit the optional item "(8) Add Terrain Limit Rings". You can add these later if you want.

    Do I reuse the same sharing code I already received from fr24?
    YES. Same email and same sharing code.
    Last edited by abcd567; 2017-07-07 at 23:10.

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    Quote Originally Posted by abcd567 View Post
    Linux in the begining looks very difficult, but as you go through it, becomes easy.

    In order to avoid typing mistakes, copy-paste commands from the thread, one command at a time.

    Take care not to omit any step. To check what was your last step, press arrow-up key, then after checking, press arrow-down key to go back to command prompt.

    Note:
    To make things simpler, omit the optional item "(8) Add Terrain Limit Rings". You can add these later if you want.


    YES. Same email and same sharing code.
    Excellent thank you, I am copying the jessie lite img to a 2gb micro sd card right now
    I am assuming I can access the Pi 3 via PuTTY like I currently can with the fr24 image?

  6. #6
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    Alright, got it all done and running thank you so much for the help, now I need to find out how to graph it and I need to tune the gain
    Again thank you!

  7. #7
    Captain abcd567's Avatar
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    As you have installed dump1090-mutability, you can now run a gain optimization sript to help you decide the value of gain. See this post/thread:

    http://discussions.flightaware.com/p...6.html#p192776

    .

  8. #8
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    Quote Originally Posted by abcd567 View Post
    As you have installed dump1090-mutability, you can now run a gain optimization sript to help you decide the value of gain. See this post/thread:

    http://discussions.flightaware.com/p...6.html#p192776

    .
    Wow very interesting thank you!
    It's running 5 tests of 15 seconds right now, we will see

  9. #9
    Captain abcd567's Avatar
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    Credit for this gain optimization script goes to its original author BartJr. (http://discussions.flightaware.com/p...4.html#p192634).

    Later some enhancements were done by lignumaqua and others, but the script is basically same as written by BartJr.

    .
    Last edited by abcd567; 2017-07-08 at 02:53.

  10. #10
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    Nifty little "automatic" gain finder.

    I think I will need to rerun it with times longer than 15 seconds, in 5 tests it found as low as 36.4 and as high as 44.5 were optimal
    I reset it to 40.2 for now until I can run a longer testing period

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