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Analog Channels 14 and 15 on MFH2 system

Discussion in 'DIRECTV Installation/MDU Discussion' started by MFH2Master, Dec 4, 2008.

  1. MFH2Master

    MFH2Master Cool Member

    22
    0
    Dec 3, 2008
    Any one in here has been seen a problem when you has a Head End system with channel 14 and 15 and you want to inject this into a mfh2 system so customer can have analog services and digital. when you do this you will get a lot of snow on these two channel.is any solution for this out there or any way to fix this with out move these two channel to another frequency.
     
  2. DtvSlave

    DtvSlave Legend

    162
    0
    Nov 14, 2007
    Are there any local channels in the area the broadcast on channel 14 or 15? If so you might have a leak in the system and you are getting bleed through
     
  3. MFH2Master

    MFH2Master Cool Member

    22
    0
    Dec 3, 2008
    This is happening in two different property's, system is proper terminated and there is no open port any where in the system. and no is not any local channel on that same frequency
     
  4. doctor j

    doctor j Hall Of Fame DBSTalk Club

    1,705
    49
    Jun 14, 2006
    Birmingham, Al.
    Must be something in the system since by default any analog signals below 860 or so MHz should be acceptable to the SWM.
    More info on your system?
    Are you just adding 14 & 15 or are these the only channels of many others affected.
    How are you "injecting". Thru MFH-6 , into swm individually or after swm's.

    one quick thought if into mutiple MFH-6 units is "over amplification"
    ? attenuate, try diplexing after swm's.

    Others may have more advice.

    Doctor j
     
  5. MFH2Master

    MFH2Master Cool Member

    22
    0
    Dec 3, 2008
    This are the only channel with the issue everything else is fine.
    system description

    SCU ( MFH1) feeding a MST774 and this feeding the FMC-6 Chassis, analog cable is going into Off air input in the FMC-6 and from the FMC-6 going to the SWM-8 and them to customer Units, we also try to go direcly to SWM-8 and diplexing after the SWM-8.....
     
  6. woodybeetle

    woodybeetle Legend

    143
    0
    Feb 27, 2008
    What is the signal level of your channels in question before and after you inject them, remember the Swm looses approx 11 dB for insertion. The average headend distribution allows for approx 5 dB at the tap, once inserted you have -6 dB, then the cable loss of approx 3 dB gives you -9 dB and the splitter in the unit (4 way) --7 loss, totaling -15(fuzzy channels),

    Also verify that your headend has the appropriate balance and slope to the riser system.
    If you have any questions feel free to PM me.:)
     

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