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  • Ressy
    replied
    Originally posted by F-EGLF1 View Post
    There is NO way an ant can cover that range, this looks more like an ornamental paperweight !!!
    At best you will probably get a gain of around -20db at 1090Mhz and that will be swamped by all the random signals that this ornament picks up!
    there is a good reason why people use TUNED antennae’s for reception, they give good gain at the required frequency and good rejection of everything else (some people also use narrow band filters to remove things like cellphone pickup).
    If you are even half serious about ADS-B reception then you need to build or buy a proper antennae.
    This isn't always true for reception only, my freq cut and designed colinear, performs no better than my 180 AU dollar (well, 22 years ago it cost that) diamond discone that I use for everything from airband reception, marine to ham radio (but I love my airband so built a side mounted dipole which also performs almost as well as my discone, I think I lost about 20 km's, but given its a metre lower, I'd expect that with trees closer

    Leave a comment:


  • F-EGLF1
    replied
    Originally posted by peterhr View Post
    The tuning issue with no real way to test it - and the hassle of putting the mast up and down and up again is the reason that I bought the Bulgarian Collinear (see the link in my footer) .
    Agreed, for the vast majority that is the best way to go, however I am cursed with curiosity and access to people and equipment that make such things both possible and fun, having an electronics background I prefer to tinker rather than buy out-rite however it often costs me more in the long run, but it is much more satisfying.

    Leave a comment:


  • peterhr
    replied
    Originally posted by F-EGLF1 View Post
    Don't forget though that any type of tube or other enclosure will alter the tuning, so you will need to adjust it with the tube in place (removing it each time to make the adjustment, then replacing it to check it's tuning)
    Also ensure that the tube you use is suitable, different mineral fillers used in the plastic tubes can make some useless, a colleague of mine who is researching antennae design has found reports that black plastic pipes are NOT suitable but most white or grey ones should be.
    The tuning issue with no real way to test it - and the hassle of putting the mast up and down and up again is the reason that I bought the Bulgarian Collinear (see the link in my footer) .

    Leave a comment:


  • F-EGLF1
    replied
    Originally posted by peterhr View Post
    There is a youtube on this - once it's built mount it up temporarily, there is discussion in the 'best antenna' thread about how many elements to make it and how to finish the top (1/4 wave whip, shorted, and so on). The temporary mount will enable you to take it down and to tweak it before sealing it into a tube of some sort.
    Don't forget though that any type of tube or other enclosure will alter the tuning, so you will need to adjust it with the tube in place (removing it each time to make the adjustment, then replacing it to check it's tuning)
    Also ensure that the tube you use is suitable, different mineral fillers used in the plastic tubes can make some useless, a colleague of mine who is researching antennae design has found reports that black plastic pipes are NOT suitable but most white or grey ones should be.

    Leave a comment:


  • peterhr
    replied
    Originally posted by sesom View Post
    Thanks for the clear words. I already read a lot about building an antenna on http://www.balarad.net/ and I will build one after my vacation. I'll be in Japan for the next weeks and in the moment priority #1 is to get everything running stable on a Raspberry Pi.
    There is a youtube on this - once it's built mount it up temporarily, there is discussion in the 'best antenna' thread about how many elements to make it and how to finish the top (1/4 wave whip, shorted, and so on). The temporary mount will enable you to take it down and to tweak it before sealing it into a tube of some sort.

    One thing you will need is an adaptor to match the dongle MCX socket to whatever you are doing with the antenna.

    Leave a comment:


  • sesom
    replied
    Originally posted by F-EGLF1 View Post
    If you are even half serious about ADS-B reception then you need to build or buy a proper antennae.
    Thanks for the clear words. I already read a lot about building an antenna on http://www.balarad.net/ and I will build one after my vacation. I'll be in Japan for the next weeks and in the moment priority #1 is to get everything running stable on a Raspberry Pi.

    Leave a comment:


  • F-EGLF1
    replied
    There is NO way an ant can cover that range, this looks more like an ornamental paperweight !!!
    At best you will probably get a gain of around -20db at 1090Mhz and that will be swamped by all the random signals that this ornament picks up!
    there is a good reason why people use TUNED antennae’s for reception, they give good gain at the required frequency and good rejection of everything else (some people also use narrow band filters to remove things like cellphone pickup).
    If you are even half serious about ADS-B reception then you need to build or buy a proper antennae.

    Leave a comment:


  • Amper
    replied
    Antenna with range from 25-2000Mhz cannot be perfect at all frequencies in that range. That antenna receive 1090, but signal quality is not good enough like one peter suggested to you has.
    That is UHF/VHF antenna.
    Dongle antenna is made for freq. closer to 1090Mhz then that one.

    Leave a comment:


  • sesom
    replied
    Maybe I did not write that clear enough. It is an external antenna for scanners with a range of 25 to 2000 MHz, when I is it on my hand-scanner and tune to 1090 MHz I can even hear the typical noise of a data transmission. This is how the antenna looks like:

    213HG6SFYSL.jpg

    This antenna should provide a much better reception than the crap 1$-antenna that came with the USB-stick.

    Leave a comment:


  • Amper
    replied
    that antenna is not for 1090Mhz and peterhr is correct. You can blame dump 1090

    Leave a comment:


  • peterhr
    replied
    Sorry for responding!

    Leave a comment:


  • sesom
    replied
    Originally posted by peterhr View Post
    antenna tuning? (or rather not tuned to 1090 MHz)

    Try making a coaxial collinear ...
    Of course I tuned to 1090 MHz and no, I don't want to make an antenna, I have a very good antenna, that does not work with dump1090.

    Leave a comment:


  • peterhr
    replied
    Originally posted by sesom View Post
    Guys, I need your help!

    I get very reasonable results with the little crap antenna that was included in my DVB-T stick mounted on the rooflight (outside), dump1090 receives between 15 and 30 planes and feeds them properly to FR24. I received planes from 245 nm away, in average the limit is at around 150 nm. Today I received an adapter to connect my scanner antenna (BNC) to the stick and now I receive 1 or 2 planes at maximum. The antenna works fine when I use it on my scanner, but gives extremely poor results on the stick.

    I tested the antenna with the stick with rtl_fm, a program to receive am/fm-radio and I can hear ATIS from EDDN airport loud and clear (EDDN is 11 kilometers away on the other end of the city). So the stick-antenna-combinations seems to work. But with dump1090 I get nearly nothing.

    Is it possible that the signal is too strong for dump1090? I played a little bit with --gain and --enable-agc, but without any improvement.


    Any ideas?
    antenna tuning? (or rather not tuned to 1090 MHz)

    Try making a coaxial collinear - try 4 elements to start with, see http://www.balarad.net/

    - tape it to a stick of bamboo or something else non-metallic to support it while you test ... see what happens.

    Leave a comment:


  • sesom
    replied
    Guys, I need your help!

    I get very reasonable results with the little crap antenna that was included in my DVB-T stick mounted on the rooflight (outside), dump1090 receives between 15 and 30 planes and feeds them properly to FR24. I received planes from 245 nm away, in average the limit is at around 150 nm. Today I received an adapter to connect my scanner antenna (BNC) to the stick and now I receive 1 or 2 planes at maximum. The antenna works fine when I use it on my scanner, but gives extremely poor results on the stick.

    I tested the antenna with the stick with rtl_fm, a program to receive am/fm-radio and I can hear ATIS from EDDN airport loud and clear (EDDN is 11 kilometers away on the other end of the city). So the stick-antenna-combinations seems to work. But with dump1090 I get nearly nothing.

    Is it possible that the signal is too strong for dump1090? I played a little bit with --gain and --enable-agc, but without any improvement.


    Any ideas?

    Leave a comment:


  • Six6siX
    replied
    Originally posted by sesom View Post
    That is what I tried, but it doesn't work. There are some other directories in dumper-helper:

    Code:
    drwxr-xr-x 2     4096 Mär 28 12:45 ClientSide
    drwxr-xr-x 4     4096 Mär 28 12:45 data
    drwxr-xr-x 3     4096 Mär 28 12:45 dump1090
    drwxr-xr-x 5     4096 Mär 28 12:45 static
    drwxr-xr-x 3     4096 Mär 28 12:45 templates
    -rw-r--r-- 1      158 Mär 28 12:45 appengine_config.py.fubar
    -rw-r--r-- 1      865 Mär 28 12:45 app.yaml
    -rw-r--r-- 1     1366 Mär 28 12:45 base.py
    -rw-r--r-- 1 17630870 Mär 28 12:45 basestation.csv
    -rw-r--r-- 1        5 Mär 28 12:45 cron.yaml
    -rw-r--r-- 1     2506 Mär 28 12:45 datastore.py
    -rw-r--r-- 1     1150 Mär 28 12:45 favicon.ico
    -rw-r--r-- 1      193 Mär 28 12:45 index.yaml
    -rw-r--r-- 1     1447 Mär 28 12:45 main.py
    -rw-r--r-- 1    28887 Mär 28 12:45 plane.py
    -rw-r--r-- 1    10729 Mär 28 12:45 planes.py
    -rw-r--r-- 1       72 Mär 28 12:45 README.md
    -rw-r--r-- 1      364 Mär 28 12:45 update_schema_handler.py
    -rw-r--r-- 1     2401 Mär 28 12:45 update_schema.py
    Where do I have to place those files?

    And in config.js I think I have to configure the following setting:

    Code:
    // --------------------------------------------------------
    //
    // This file is to configure the configurable settings.
    // Load this file before script.js file at gmap.html.
    //
    // --------------------------------------------------------
    
    // -- JSON-feed -------------------------------------------
    CONST_JSON = '/dump1090/data.json'; // Default '/dump1090/data.json'

    I cannot find data.json on my system. As far as I understand it, this is the data produced by dump1090, but how do I produce this file? I run dump1090 with the following parameters:

    Code:
    ./dump1090  --interactive  --net  --net-beast --interactive-rows 60 --aggressive --enable-agc
    Is there something missing? I am confused, so any help is appreciated!
    I think you may have copied the wrong folder. Inside dump1090helper there is another dump1090 folder. It's the contents of this folder you need to copy over.

    There are a bunch of files that need editing such as your coordinates etc. I'm away from my computer at the moment will reply when I can. Good luck

    Leave a comment:

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