How To Diplex OTA with the AT9 dish & MPEG-4

Discussion in 'DIRECTV Installation/MDU Discussion' started by Cap'n Preshoot, Aug 19, 2006.

  1. Sep 5, 2007 #101 of 323
    desulliv

    desulliv AllStar

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    If the feed is diplexed from the WB68, but not diplexed at the HR20, might I have a problem?
     
  2. Sep 5, 2007 #102 of 323
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    :confused: you can't diplex before the WB68, so from the WB68 can't be diplexed to the HR-20, but could be on other outputs to the other receivers.
     
  3. Sep 6, 2007 #103 of 323
    harsh

    harsh Beware the Attack Basset

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    Is it safe to assume that low-band won't be sent to receivers that can't deal with it? I doubt it.

    I'm assuming that low-band is sent to all receivers by the WB68, therefore all diplexed OTA runs a substantial risk of being trashed.
     
  4. Sep 6, 2007 #104 of 323
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    The "real" question is: how much isolation does the diplexer have between ports.
    Or to ask it another way: will Ka-lo be rejected on the SAT port & by how much?
     
  5. Sep 6, 2007 #105 of 323
    Ext 721

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    no, but you can put one in the multiswitch :D
     
  6. Sep 7, 2007 #106 of 323
    Chip Moody

    Chip Moody Legend

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    I just scanned through this thread, but want to make sure about this...

    If I take the BBC off my H20 and put it down in my basement on the multiswitch output that feeds the room the H20 is in, I would then be able to put a diplexer in (post-BBC) and send sat + basic cable up the same line to my room? (To then be split back out to the H20 and RF input on my TV)

    Cable company has offered to give me basic cable in addition to my cable modem service for $10 less than I was paying for just the modem, so I figured what the heck - cheap insurance if the sat service goes out for any reason.

    And while I'm at it - if I can get away with asking this in a D* forum, does anyone know if I should use/need any kind of special splitter or filter on my cable line now that I'll have one lead going to the cable modem and another to my TV?

    Thanks,
    - Chip
     
  7. Sep 7, 2007 #107 of 323
    carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Chip,

    In theory you can do what you want. However until they light up the new HD channels from D10 no one knows for sure how well this will work (if at all). DirecTV says you need to keep the BBCs fairly close to the receiver, but they don't specify what that means. Ten feet, 50 feet? Just don't know.

    Part 2 of your question/issue is that you also have cable internet. It is normally recommended that you do not diplex that. Split the cable feed and run a dedicated coax to the cable modem.

    Carl
     
  8. Sep 8, 2007 #108 of 323
    Chip Moody

    Chip Moody Legend

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    Thanks Carl. I suppose I'll wait until D10 comes online and then try playing. The cable service isn't coming until the 25th anyway...

    As for part 2, I may not have worded that correctly. My cable line currently comes into my basement and straight up into a first floor room where the modem lives. I was intending to "Y" that cable in the basement with one leg going to the modem and the other leg going to the diplexer. I hadn't intended to put the modem at the distant end of the diplex scheme. My real question was if I needed any kind of "filter" - like those used for DSL lines - for the cable lines. Y'know, filter out the cable modem digital signal and keep it from mussing up the analog basic cable signal.

    - Chip
     
  9. Sep 8, 2007 #109 of 323
    harsh

    harsh Beware the Attack Basset

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    The cable modem won't interfere with the CATV channels, but it may mess with the satellite channels.

    I have lifeline cable and a cable modem and it interferes with my UHF modulators. I'm not sure if the diplexer would filter out enough the CATV signals that might interfere with satellite reception or not. I'm going to have to employ a low pass filter to get the CATV signals to stop interfering.

    The filter that the cable company uses to prevent me from receiving other analog channels blocks cable channels 30 to 70. I suspect that the higher frequencies on which the digital channels are riding is what is hashing my UHF signal.
     
  10. DaBearsfan

    DaBearsfan Member

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    Aug 3, 2007
    I have both an OTA antenna and basic cable (provided with Internet service). I have 2 RG6 cable runs from my Multiswitch in my home theater room to our great room. I have been diplexing the OTA on one line and basic cable on the other to the HR10-250 in my great room for over 2 years. That way we get the best of all worlds when bad weather hits. The cable signal has never interfered with the sat signal. All I did was split the cable line with a normal splitter no special filter was required for my cable system.

    Just a week and a half ago ago I upgraded all my HR10-250's to HR20-700's. I have not had time yet to run a test to see if it still works. I have been on the road and hopefully tomorrow I can move the BBC's to the multiswitch and see it it still works.

    But of course once D10 Goes live it appears all bets are off on whether this will still work. I NEED A SWM!!:D
     
  11. jgriffin7

    jgriffin7 Native Texan

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    For what it's worth:
    Using my HR20-700 running the latest CE.
    Tuner 1: straight from multiswitch in wiring closet, through the house, into BBC hooked directly to back of HR20-700: Sat 103(b) Transponder 11 reading 97.
    Tuner 2: from multiswitch in wiring closet into BBC, then diplexed with OTA antenna, up through the house, diplex back out, hooked into back of HR20-700: 103(b) Transponder 11 reading 98.

    FYI, tuner 2 showed a reading of 0 before I moved the BBC to before the first diplexer.

    That make sense? I'm basically saying it works, or at least I get a signal...
     
  12. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Sounds encouraging. How far is the coax run from multiswitch to receiver?

    Carl
     
  13. jgriffin7

    jgriffin7 Native Texan

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    Rough estimate - 70 feet.
     
  14. cal87

    cal87 AllStar

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    Sep 6, 2006
    I am seeing signal levels of 96 on both tuners. I have an OTA diplexed feed, with the BBC about 30ft from the box. Looks good so far. Of course, will still have to wait for real programming before we're sure about this.
     
  15. TreyS

    TreyS Legend

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    Aug 22, 2006
    Any suggestions on a diplexer? Thanks!
     
  16. loudo

    loudo Well-Known Member

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    The D* installation video tells you not to use any diplexers. Something to the effect that the OTA frequencies will interfer with the new D10 signals.
     
  17. TreyS

    TreyS Legend

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    Aug 22, 2006
    Post 111 says otherwise in terms of signal strength. :confused:
     
  18. KCCardsfan

    KCCardsfan Godfather

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    Post #111:

    This is what I did, moved my BBC to the output of the Zinwell (with a 6" coax jumper), then Diplexed in my OTA, have 88-96 signal on all 16 103b Transponders, both tuners (just checked). And have the 'Searching for Signal' on ch-499 both tuners. Will wait to see when channels are active if it works 100%, if not I will remove the Diplexers. Had 0 on all 103b tuner 2 Transponders before I moved the BBC.
     
  19. loudo

    loudo Well-Known Member

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    Go to this site and in one of the installation videos it talks about NOT using them with the new system. I am not sure which one it is, but one of them talks about the use of diplexers. http://www.solidsignal.com/satellite/at9_install_videos.asp
     
  20. TreyS

    TreyS Legend

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    Aug 22, 2006
    I saw that video too but with the BBC moved closer to the multiswitch and two diplexers installed, signal strength went up to 95 for post 111 above.

    I was looking at my 103(b) transponders the other day and noticed Tuner 1 on my HR20 has them all at 85-95 but on Tuner 2 they were all over the place from 0 - 80. I went over the D* installation and noticed the tech left my diplexer on the Tuner 2 line, right BEFORE my BBC at the receiver. I removed it and the signals were just like Tuner 1 for me.

    If post 111 works for that guy as well as others here, then it's worth the $7 to try it IMO. I just placed my order....
     

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