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SWM 8 and DECA Broad Band Adapter

Discussion in 'DIRECTV Connected Home' started by O2BRich, Nov 22, 2011.

  1. HoTat2

    HoTat2 Hall Of Fame

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    Los...
    OK, my apologies, but I was basing your "won't work" in post #10 off what you wrote in your prior post #8 to the OP.

    I'm sure Bob has posted his PHY Level numbers somewhere before, but I'm not about to go through the effort of searching for their burial locations in the forum at the moment. :)
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Maybe it's because I know what I'm posting, but there isn't a discrepancy between these posts.
    If you have to use an external BSF, you can't use both outputs.
    PHY levels alone would be meaningless, as one would need to section the loss to the SWM5 that he has, to read the loss of the non green labeled SWM5/8s.
     
  3. bobnielsen

    bobnielsen Éminence grise

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    Bainbridge...
    The numbers I posted for my SWM5 were quite a while ago and I don't recall what they were, but they appeared to be acceptable (or marginally so) for WHDVR use without a BSF. The SWM8s could be somewhat different, depending on the internal layout (I don't know if the SWM5 went beyond the field testing but don't think there any green label versions). It would be interesting if someone had the equipment to measure the return loss of both SWM5s and non-green label SWM8s at the MRV frequency range.
     
  4. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I don't think return loss is the issue, but since a non modified splitter has about 23-25 dB isolation [loss] between the outputs, but if a BSF in on the input, the loss is "merely" the reverse insertion loss + the forward insertion loss. Now without the BSF, what does the DECA reflect off of?
     

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