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  1. #1
    Senior Mitglied
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    ReceiverDankeAktivitäten
    Box 1:
    Octagon SF8008 Twin
     
     

    How come signal values are shown higher in openATV?

    I've tried many images, signals were almost the same in all of them.
    Only in openATV signal values are being shown 10-12 % higher than all the others.
    Of course, this doesn't mean that the reception is better - a channel that gets image distortion at 40 % in others, has it at 45 % in openATV.
    But still, it's a good thing and I wonder how is this possible, probably with a system file that is different from all the others?
    And a fantasy question: Could we get those delusive (!) high signals in other images too, if we replace whichever file it is? :P

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  2. #2
    Senior Mitglied Avatar von Lucifer
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    ReceiverDankeAktivitäten
    Hi GH_162,

    the sinal strength is measured by the tuner. the tuner-driver provides the system with information about the signal strength.
    in the image there is a conversion table, that converts the information of the tuner driver into a value that can be used to display the signal strength on your screen.

    i think that the difference in value is caused by differences in the conversion table of different images.
    so, if you want a higher signal strength onn your screen, i think you will have to make some changes there.
    i can't tell you the location of the coversion table. if you want to know, you will have to ask one of the programmers of the image.

    the signal strength on your screen is just an indication, not an accurate value.
    if you want an accurate value, you need a spectrum analyzer. and that costs a lot more than your box. take a look at this: Spectrum Analyzers

    grt Lucifer

  3. Thanks GH_162 bedankten sich
  4. #3
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    Box 1:
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    Hi Lucifer,
    Thank you very much for this in-depth information.
    I'll probably figure out eventually which file may that conversion table be.
    It is also very surprising that those spectrum analyzers are such costly devices.

  5. #4
    Senior Mitglied Avatar von s3n0
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    ReceiverDankeAktivitäten
    Box 1:
    Formuler F3
     
     
    Box 2:
    Vu+ Solo SE V2
     
     
    Box 3:
    Formuer F4-TURBO
     
     
    Signal quality indicator only serves for amateur tuning of the antenna. Simply move your satellite antenna until you reach the maximum on the signal pointer. If you set your antenna under amateur conditions, it will still generate a +/- 20% offset signal. Therefore, it does not matter what the satellite box or its firmware and drivers are showing - as mentioned above. It is important to know what values are there under normal circumstances. For example, when the snow falls on the parabolic antenna, the signal drops and you know how much it is.

    If you want to measure the real signal strength, then only with high-quality sensitive equipment. For this purpose, service technicians use special devices designed to set up antennas. Example:
    Formuler F3 (BCM 7362-A0, 2x 750 MHz, mips)
    Formuler F4 TURBO (BCM 7362-5, 2x 750 MHz, mips)
    Vu+ Solo SE V2 (BCM 7429, 2x 1300 MHz, mips)

  6. Thanks GH_162 bedankten sich
  7. #5
    Senior Mitglied Avatar von Lucifer
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    ReceiverDankeAktivitäten
    The reason that a spectrum analyzer is so expensive, is because of the accuracy.
    you only need this accuracy, if you want to measure or adjust rf signals and equipment.
    and every year the sectrum analyzer needs to be calibrated (checked and tuned), to keep the accuracy, and that's also expensive.

    a couple of years ago i noticed the difference in signal strength of different boxes and images.
    i have a spectrum analyzer, so i compared the output on the sceen, and the measured value of the spectrum analyzer. (different boxes and images)
    i also connected a variable attenuator (to make the signal weaker) and compared the differences with different signal strengths.

    i only tested DVB-C tuners, and the tuner that gives the most accurate signal strength is my usb DVB-C/T2 tuner from Sundtek.
    Sundtek do all the development (hardware and drivers) themselves, and i don't know any comapny with a better support than Sundtek. (check their forum)
    i think they check the signal strength with professional test equipment when they develop the driver (and conversion table?).
    and i think that the developers of the image don't have this test equipment, and that's understandable because they are not (hardware) technicians.

    if Sundtek would make an enigma2 box, i would buy it. especially for their support.

    grt Lucifer

  8. #6
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    Box 1:
    Octagon SF8008 Twin
     
     
    Thank you too, s3n0, for valuable information and the video.

  9. #7
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    Zitat Zitat von Lucifer Beitrag anzeigen
    if Sundtek would make an enigma2 box, i would buy it. especially for their support.
    Thanks again for extra info, I'll keep that in mind for future box preferences.

  10. #8
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    Box 1:
    Octagon SF8008 Twin
     
     
    An interesting addition to this thread:
    I was using a Vu+ Solo 4K when I wrote the first message, now I have a DM920 and it came as a surprise that the situation seems to be the exact opposite in Dreambox devices!
    After the Newnigma values which were quite close to what I was used from Vu+, openATV is now showing them almost 10-15 % less than they're supposed to be - not that the reception is any worse because of low values but still, I wonder how this is possible.

    Also, I'd greatly appreciate if anyone can enlighten me what those two new options in tuner configuration stand for:

    1. SCPC optimized search range ----> yes/no
    2. Force Legacy Signal Stats ---------> yes/no

    Thanks.


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