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. May 3, 2008 #301 of 323
    DtvSlave

    DtvSlave Legend

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    Channel 44


    Is it possible to run 4 lines to a 6x8 then 4 lines from that to a swm8 so we could use 8 tunners from the swm8 then the other 4 from the 6x8?
     
  2. May 3, 2008 #302 of 323
    DtvSlave

    DtvSlave Legend

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    Is there some place to get install instructions on the swm8?

    I have come across a few more questions and thought maybe they would be answered there instead of keep asking questions that have been more than likely answered several times, but everytime i do a "search" i get pages and pages to read through.

    #1 the customer has 5 hr21's (not 20's like previously stated) 3 of them have 2 lines and 2 of them only have 1 line. Customer wants to see security cameras on 4 of the tv's, one of them only have a single line. Is it possible, since that only makes 8 tunes between 5 hddvr'd to use the swm8 with a splitter on 3 dvr's to make 6 tuners, then on the other 2 just plug the line into tuner 1, thus not using the other 2 tuners?

    #2 if you only need one PI per swm8, does that mean that you put it near the switch?

    # 3 using the info that i have i.e. 5 hr21, 3 with dual lines, 2 with single lines, can someone draw something up that shows me how it would be wired? Meaning where someone would put the PI and the splitters. I doesn't have to be fancy just a quick sketch to give me an idea.
     
  3. May 3, 2008 #303 of 323
    carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Each TUNER counts against the 8, and you can't run only one tuner on an SWM fed DVR. So with a single SWM device you can feed a maximum of four DVRs. For your customers installation, you need to either use two SWMs or an SWM and a WB68.

    You should be able to diplex security camers assuming you modulate them first (typically UHF modulators on channels 65 and up).

    It can be, but doesn't have to be, near the switch. You want at least 15 feet of coax between the SWM and the PI. If you put it near one of the DVRs, make sure you have power passing ports on any splitters between the SWM and PI.


    Using the SWM, you only use one coax to each DVR, and as noted above the maximum is four DVRs. The coax is connected to the satellite 1/FTM input and you leave the Satellite 2 input open.

    Where and how you use splitters is up to you. You can run SWM1 output directly to the PI and the output from the PI directly to one DVR, then take the SWM2 output and split it to feed the other three DVRS.

    Or you can take the SWM1 output, feed it directly to the PI, then take the PI output and feed it to a splitter to feed 2, 3 or all 4 DVRs.

    Or you can take the SWM1 output, feed it to a splitter that passes power on one output. Feed that output to the PI, then the output of the PI to a DVR and feed the other outputs from the splitter directly to the other DVRs.

    If you want, you can run a separate coax from the SWM2 port on the SWM directly to another DVR or via a splitter to two or three DVRs. Again, the total tuner count cannot exceed 8 (2 per DVR) for the total SWM.

    It does not matter if you take the SWM1 output and split it to all units, or if you divide it up between the SWM1 and SWM2 outputs, so long as the tuner count does not exceed 8, and the PI is connected to the SWM1 port.

    Carl
     
  4. May 4, 2008 #304 of 323
    DtvSlave

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    Thank you for the help! Just ordered one for the customer and will be installing it next week. Should be fun doing wiring it with a 6x16 switch. I see the swm8 has an off-air port, since there is no need to use bbc with the swm8, does that mean that we can use the off air port to get the hd locals?
     
  5. May 4, 2008 #305 of 323
    David MacLeod

    David MacLeod New Member

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    thats something that seems to be often overlooked when discussing the swm. on other places (really not tech sites) I have seen people saying 8 dvr's can be used which is not true. key way I remember it is 8 tuners or 4 dvr's.
     
  6. May 4, 2008 #306 of 323
    carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Are you keeping both? You have 2 choices. First is to run them in parallel (split the four coax from the dish, and run one output from each splitter to the same port on both multiswitches). Second is to connect the SWM to four outputs of the 6x16.
    You can connect an off-air antenna to the antenna port on the SWM, then use diplexers at the receivers to extract the OTA signal. There is some question as to just how well the OTA mixing works in the SWM, some people prefer to use regular diplexers to insert the OTA rather than using the OTA port on the SWM.

    Carl
     
  7. Budge

    Budge New Member

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    This thread has been very useful, but it is SO LONG. I've tried to read as much of it as I can to find the answers I need, but enough time has passed that I'm not sure the answers are still valid. So can I get an update, please. :)

    I have two HR20-700's being fed by an WB68. I'm trying to diplex my modulated security camera feeds. I have removed the BBC from one line of each HR20 and repositioned between the WB68 and the Diplexer. I seem to able to get all of my HD Sat channels still (how do you make sure?), but my modulated signals aren't working with the HR20.

    Is the HR20 capable of showing modulated signals? The ANT menu asks me for my zip code, then tries to find all my local stations. But there doesn't seem to be a way to just search for my modulated channels.

    Any thoughts? Is everyone switching to the SWM module, or does this diplexor method still work with the current satellites? Thank you.
     
  8. houskamp

    houskamp Active Member

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    HR20 can ONLY recieve digital signals.. only way I can see it working is to connect the ant from diplexer to the tv (and switch to tv to view cams).
     
  9. robq391

    robq391 Legend

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    Nov 6, 2007

    This method still works with current satellites. Use of SWM makes things a lil' neater (eliminating BBCs & diplexors on switch end) & gets 2 tuners to DVRs through 1 coax.
     
  10. David MacLeod

    David MacLeod New Member

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    fwiw I noticed an across the board 15% drop in ota signal strength by using the built in ota port on swm-8.
    I had to use diplexers, actually what worked best for me was a channel master combiner ( http://www.solidsignal.com/prod_display.asp?prod=CM4002IFD ) between PI and SWS-4 splitter. from there on normal inexpensive eagle aspen diplexers do the job fine for me.
    its a trial and error experiment really.
     
  11. dettxw

    dettxw MRVing

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    I experienced something similar though not sure I can put a number on the loss.
    I'm back to running diplexers on a SWM line and it works just as well as with an output from the WB68.
    One of these days I'll get a bigger antenna or maybe an amp and see how the SWM8 OTA port works then.
     
  12. David MacLeod

    David MacLeod New Member

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    I am using a distribution amp, 3 feeds go straight to wall plates for tv's themselves and 1 goes to the combiner. my weakest station is approx 40 miles (by air) away and I get 95-99% on all 3 am21/hr21 units.
    the 15% drop was not dependent on the amp, IOW I had 15% drop no matter if amp was inline or not. amp just made it higher to start with of course.
    not sure if that helps you or not.
     
  13. Budge

    Budge New Member

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    Feb 23, 2009
    Are there any digital modulators on the market?
     
  14. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Not on the consumer market. Figure a couple of grand or more for each digital channel you want to modulate.
     
  15. Budge

    Budge New Member

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    Feb 23, 2009
    OK, thanks. I went ahead and connected my modulated cameras directly to the TV ANT input. That works fine for seeing my cameras.

    Now how do I check to be sure I haven't lost anything by relocating my BBC? Is there a channel I need to tune to in order to double check?
     
  16. idigg

    idigg Legend

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    May 8, 2008
    I would like to know this as well... I just moved all five BBC's right after my multiswitch to clean up the cables behind my three TV"s, and want to make sure I still have all stations. I have the same exact signal strengths...
     
  17. dave29

    dave29 New Member

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    Your local HD's would be a start.
     
  18. idigg

    idigg Legend

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    May 8, 2008
    Ok, I get those all so I guess I'm good. Thanks!
     
  19. Jul 6, 2009 #319 of 323
    idigg

    idigg Legend

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    Am I being paranoid? I moved my BBC's right behind my ZInwell WB68 after using a 1ft jumper cable. It seems the BBC"s get pretty warm to the touch? Not hot, but warm. My concern is I have 5 of these BBC's up in my suspended ceiling with insulation.

    I just don't remember if the BBC's were warm to the touch when I had them hooked directly to the IRD's. Thanks for any advice.
     
  20. Jul 6, 2009 #320 of 323
    carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Some amount of warmth would not be surprising, as the LNB and WB68 are powered from the receiver (via the coax through the BBC). So there is current flow there, which could generate heat.
     

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