Philips: Hintergrund – Signalstärke vs. Signalqualität

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  • #26884 Reply
    Uphaus Andreas

    Hallo, wir haben einen Philips PFL 40 8605. Versorger ist KabelDeutschland und wir haben ein CI+ Modul. Nur beim ZDF HD flimmert alle paar Minuten das Bild und manchmal stockt dabei auch der Ton. Nun sieht man unter Status das die Signalstärke bei allen HD Programmen 82 anzeigt. Die Signalqualität schwankt zwischen 23 und 100. Auch wenn 100 angezeigt wird steht hinter 100 in Klammern (BER:0.0xX1E-6) Die Zahlen hinter BER ändern sich auf 0.12x1E6 oder auch 2.8- Sobald 0.0 weg geht und irgendeine andere Zahl kommt ist das Bild am flimmern oder stocken. Eine Firma hat die Anschlüsse überprüft und für gut befunden, alle anderen Programme laufen ja gut. Bei einem Samsung Zweitgerät haben wir diese Störung nicht. Was können wir tun?

    #26886 Reply


    also es sollte nichts schwanken. Hier empfielt es sich, mal ein anderes (gutes) Kabel zu verwenden… Wurde der Samsung TV an derselben Dose mit demselben Kabel getestet?


    #181130 Reply

    @Uphaus Andreas

    I own a OLED903/12 and I am seeing more or less the same behavior when viewing channels from one particular transport stream @ 498 MHz through my Smit v1.3 CI+ module with Dutch cable provider Ziggo.

    After 10 to 20 minutes of the TV having been first switched to a channel in that transport stream, the signal quality for this stream will plummet from 85~90% to 0% and the bit error rate (BER) will sky-rocket into the ten-thousands. (Happens concurrently for all channels in the stream, ofcourse.)

    Image and audio will break down and finally the TV completely lose the signal, showing instead a toast notification that there is no cable lead plugged in or the channel is scrambled. Some 10 to 20 seconds later, signal quality crawls back up and after 1 to 2 minutes it has reached its regular 85~90% quality with BER 0e-6 after which it will stick and remain OK as long as the TV does not go to standby. (I can switch channels; go use apps; switch to HDMI; etc. and everything remains fine.

    Had three individual technicians on site sofar, each of whom has measured the signal at various points inside my home and as well as out on the street in service stations. Everything’s perfect.

    Connecting an external Humax tuner to the same coax cable: 100% quality signal, no BER, no weird signal dip.

    At this point, I’m thinking either the tuner is flawed (broken out-of-the-box) or it has something to do with the frequency the provider is using.

    Some explanation on that front:
    In my case the TV shows that the transport stream is on 498.0 MHz. However, the on-site technicians’ equipment shows the actual frequency that is in use as 498.75 MHz. I wonder if the tuner does not handle such mid-frequencies correctly. E.g. storing the rounded frequency – tuning into that initially, and only if the signal is lost, retuning and discovering the correct mid-frequency 498.75 MHz.

    Anyone capable of sharing any insight here:
    it would be *most* welcome, as trying to get to the bottom of this is driving me somewhat insane.

    Cable provider is currently gunning to point the buck at Philips and every time they have to send a technican to fiddle with things, there’s a 1 to 2 weeks waiting period.

    Philips ofcourse has been notified of the issue but it didn’t sound familiar to them. It would be passed on to their technicians and they’ll contact back via e-mail as soon as they know anything. Though; given past experiences with TV manufacturers (Sony; don’t ask…), I’m inclined to not trust anything usable to be produced from that venue for now.

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