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79 posts

Master Geek

# 20938 10-Apr-2008 17:39
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Hi there had one of my collegues with a problem today. They had installed a new power point in a bedroom and ran the decoder off this PPT they discovered that when they turned off the decoder in the bedroom that it momentarily affected the sky decoder in the lounge. The decoder would loose signal for about 15 - 20 seconds before comming back. I did a bit of testing and it seems that they have had this issue from the word go. The only thing I can think of is the LNB is getting its 18v feed from the decoder in the bedroom and when it is switched off it then gets its feed from the sky decoder in the lounge the latency could be due to the decoders being two different types one is the old motorola (bedroom) and the other is the later silver ones (lounge). I dont think it is the 2way splitter as it is a matchmaster all ports pass and they are very good splitters. I have done a lot of SAT work and have never seen an issue like this before.
Hope someone can help just wanting to increase my knowledge.

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6964 posts

Uber Geek


  # 122644 10-Apr-2008 19:25
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could be that during powerdown the box throws out a splash of 22kHz causing the LNB to switch orbit locations, (assuming a dual throat LNB is involved).


79 posts

Master Geek

  # 122653 10-Apr-2008 20:01
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cheers cyril I didnt even think of a 22khz burst, didnt even check the lnb oh well upto sky now, cant wait for another one of these so I can have a play.


22522 posts

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  # 122660 10-Apr-2008 20:26
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I recall that a 22kHz or 18v utput briefly was a problem with some dvb-s cards for data reception. Some would do it from card init till the software set it sometimes. Same thing could happen with a STB I suppose.  


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  # 122700 10-Apr-2008 21:59
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I have 2x pace II's (the new silver ones) and the sharp dual LNB and I do not have such problems, not even with "other equipment" connected to one of the ports. Same matchmaster madeinchina splitter. I can only assume it's a powering glitch.

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