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SWM Expander?

Discussion in 'DIRECTV Installation/MDU Discussion' started by fluffybear, Apr 19, 2012.

  1. fluffybear

    fluffybear Hall Of Fame DBSTalk Club

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    Jun 19, 2004
    Peachtree...
    A DirecTV is out trying to fix a problem I have been having for the last few weeks with the picture freezing up on one of the media centers (HR34). I have checked everything with the system and have even changed out a few items (cabling, switches, etc.) thinking that might be the problem but to no avail.
    Anyway, the tech just told me that my SWM-16's were not cascaded properly (coming off the legacy ports of SWM-16 #1 to the inputs on SWM-16 #2 inputs) and that I actually needed a SWM expander in order to get the SWM-16's to work properly.

    I have been cascading SWM's for years (SWM 16's for the last year) and while I don't mind him changing it out, is this correct?
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Dec 9, 2006
    There is merit to his comment. DirecTV doesn't support cascading off the legacy ports.
    Through some testing it's been found the legacy ports are -10 dB from the input.
    The E2 SWiM expander is "merely" a group of 2-way splitters in one package.
    Using one would be no different than using 2-ways to feed both SWiMs.
    The difference using splitters is both SWiM receive the same levels from the dish, though roughly 5 or 6 dB lower.
    Cascading means the primary SWiM gets the full signal level, and the secondary is four or five dB below what it would get off a splitter.
    So this seems to come down to:

    1. drop the levels to both equally by 5 or 6 dB
    2. drop the levels to only one by 10 dB.
    3. Add an amp to compensate for the lower legacy ports levels and have both SWiMs at full signal levels.
     

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