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VUDU vs Satellite

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    #91
    Re: VUDU vs Satellite

    Originally posted by NA9D View Post
    Now what your satellite receiver in your house does is take and convert a selected channel in that 400 MHz to 1 GHz range down to channel 3 which is somewhere around 65 MHz (give or take - I forget the exact frequency and am too lazy to look it up).
    Actually for DirecTV it is more complicated than this. The receiver sends a different voltage up to the satellite dish to indicate which polarity it wants. Each LNB in the satellite dish can only get half of the channels at one time. This is why you can't just "split" the satellite signal. For multiple boxes, you need to use a multi-switch and use at least a dual LNB dish.

    In the pre-HD days, the multi-switch would get half of the channels from one LNB and half from the other. Then each box would indicate what it needed for the channel being tuned and the multi-switch would give it the correct ones. Nowadays it is more complicated because there are up to 5 LNBs and more satellites but I'm pretty sure it is basically the same thing.

    This is also the reason that even the DirecTivo box had to have 2 physical satellite feeds, one for each tuner. This is in contrast to how cable TV can be split and why the cable DVR boxes need just one. Here is a link that describes it:

    http://www.hometech.com/learn/dss.html

    Comment

      #92
      Re: VUDU vs Satellite

      Originally posted by RobertHodge View Post
      Wow!! That's cool stuff. Thanks!!!

      Now I know I why I have no need for Google or Wikepedia.

      But you didn't answer the submarine question. i.e. traveling waves through a denser medium via very low freq transmission and content preservation. I'm guessing that you could send a HD VUDU movie to a sub via downconversion but it would take the sub about a week to get the whole content.

      Also you didn't address pink grapefruit. Is it really pink or is it yellow??
      First of all, pink grapefruit really is pink. There is grapefruit that is not pink grapefruit that could be considered yellow or even white.

      As for submarines, water is a tremendous attenuator of RF energy. So if a submarine is deep under water, the communication options are rather minimal. The way that they are communicated with is via VLF range frequencies in the kHz range. These frequencies are the only ones that can basically travel through the ground and under water. Because of the low frequency, the available data bandwidth is extremely low. So the communication is typically done by an extremely low baud rate radio teletype or Morse code (generally it's teletype). It can take minutes to maybe even an hour or more for a single message to get across. Not much communication goes on then with submarines deep under water. The Navy maintains some rather large transmission stations for this purpose. Mainly, the communication would be used for something like "launch the missles." For higher rate coms, the submarine would need to get near the surface where they can then launch tethered antennas that would float on the surface or just under it and then they can receive the higher frequencies and communicate more easily. It's a big challenge...

      Comment

        #93
        Re: VUDU vs Satellite

        Originally posted by redwein View Post
        Actually for DirecTV it is more complicated than this. The receiver sends a different voltage up to the satellite dish to indicate which polarity it wants. Each LNB in the satellite dish can only get half of the channels at one time. This is why you can't just "split" the satellite signal. For multiple boxes, you need to use a multi-switch and use at least a dual LNB dish.
        Yeah true. I was thinking of a single LNB. For an individual LNB, it's how it works!

        Comment

          #94
          Re: VUDU vs Satellite

          Originally posted by redwein View Post
          Actually for DirecTV it is more complicated than this. The receiver sends a different voltage up to the satellite dish to indicate which polarity it wants. Each LNB in the satellite dish can only get half of the channels at one time. This is why you can't just "split" the satellite signal. For multiple boxes, you need to use a multi-switch and use at least a dual LNB dish.

          In the pre-HD days, the multi-switch would get half of the channels from one LNB and half from the other. Then each box would indicate what it needed for the channel being tuned and the multi-switch would give it the correct ones. Nowadays it is more complicated because there are up to 5 LNBs and more satellites but I'm pretty sure it is basically the same thing.

          This is also the reason that even the DirecTivo box had to have 2 physical satellite feeds, one for each tuner. This is in contrast to how cable TV can be split and why the cable DVR boxes need just one. Here is a link that describes it:

          http://www.hometech.com/learn/dss.html
          But do you think that it is technically feasable to capture the whole satellite spectrum via (let's say) 5 LNB's and convert it to (let's say) 256 channels of CATV??

          Comment

            #95
            Re: VUDU vs Satellite

            Originally posted by RobertHodge View Post
            But do you think that it is technically feasable to capture the whole satellite spectrum via (let's say) 5 LNB's and convert it to (let's say) 256 channels of CATV??
            Well, it certainly could be done. OK, you could only pick 256 channels of satellite!

            But to say it could be done vs. getting a commercially made product to do it is another matter.

            Comment

              #96
              Re: VUDU vs Satellite

              So how do they split the new signals. With DirecTV and the new receivers and 5 LNB dishes they have splitters that allow you to go to multiple boxes. And then each box can take that one cable and split it for two tuners. I know when I had DirecTV it wasn't this way but that was when they had the 3 LNB dishes.
              here is a link to the Single wire multiswitches and splitters for DirecTV.
              http://www.weaknees.com/swm-directv.php?code=93295

              Comment

                #97
                Re: VUDU vs Satellite

                It looks like it requires a special splitter to split the one wire into 2. It doesn't sound like traditional splitting where both outputs are duplicate copies of the input.

                Comment

                  #98
                  Re: VUDU vs Satellite

                  When I had Dish Network it had a multi-LNB on it. If you wanted to add another dish, then you used what was called a Multi-Switch. Each box would send a signal to the Mult-Switch and it would determine how to multiplex the LNB signals.

                  Comment

                    #99
                    Re: VUDU vs Satellite

                    Things are a chaning in the DirecTV world. Most of the new receivers now support SWM or Single Wire Multiswitch:

                    http://www.weaknees.com/swm-directv.php

                    This setup will also allow "Spiltters" in line since the real switch is in the bus of the 5 LNB dish.

                    The old Multiswitch stuff has now been demoted to "Legacy" support.

                    Here is a basic description:

                    http://www.pdisat.com/assets/DIRECTV_MFH2tm_PDISAT.pdf

                    Comment

                      #100
                      Re: VUDU vs Satellite

                      I wonder what that means for my existing 8-way multi-switch. Will it continue to work as my only multi-switch and splitter? Do I need to add the new SWM also? If I do, will my old multi-switch act as an 8-way splitter or would I need to replace it with a new 8-way splitter? If I need to add the SWM it will be a pain because I don't have room for it and splitters where my current multi-switch is.

                      I really want to know the answers to this before I let a technician come out and upgrade me for free.

                      Comment

                        #101
                        Re: VUDU vs Satellite

                        Originally posted by redwein View Post
                        I wonder what that means for my existing 8-way multi-switch. Will it continue to work as my only multi-switch and splitter? Do I need to add the new SWM also? If I do, will my old multi-switch act as an 8-way splitter or would I need to replace it with a new 8-way splitter? If I need to add the SWM it will be a pain because I don't have room for it and splitters where my current multi-switch is.

                        I really want to know the answers to this before I let a technician come out and upgrade me for free.
                        I don't really know the full answer.

                        But I'm pretty sure Directv has manfuctured an SWM-8 switch that can be obtained where it takes the 4 coax wires from the LNB 5 dish as inputs and then take 2 outputs from the switch, connect it to a splitter then run a single coax to the receiver and connect it to the SWM input connector on the receiver.

                        What I'm not sure about is if you could connect multiple receivers to that single coax run or not. I "think" you can because they are claiming it as a solution for MRV (multi room viewing).

                        The other thing I've heard is that you can get a new LNB 5 dish that has the SWM switch built into the dish. And that only one wire comes out the dish to feed all your receivers.

                        I have 5LNB dishes but not that kind. So I don't want to mislead you, but it's definitely worth looking into before you upgrade your dish to 5 LNB.

                        Regards

                        Comment

                          #102
                          Re: VUDU vs Satellite

                          That is one reason I am holding back on any DTV upgrade again until they can guarantee that the SWM is going to be in the LNB bar vs. in my basement. I don't want any more holes drilled in my house.

                          Last time I called about getting a new dish the tech showed up with one of those ugly 1st gen things and I turned him away and canceled the order.

                          But right now I am pitting DTV against AT&T Uverse. Uverse will at least use my Cat5 cable plant.

                          Comment

                            #103
                            Re: VUDU vs Satellite

                            Originally posted by RonV View Post
                            That is one reason I am holding back on any DTV upgrade again until they can guarantee that the SWM is going to be in the LNB bar vs. in my basement. I don't want any more holes drilled in my house.

                            Last time I called about getting a new dish the tech showed up with one of those ugly 1st gen things and I turned him away and canceled the order.

                            But right now I am pitting DTV against AT&T Uverse. Uverse will at least use my Cat5 cable plant.
                            Yea, unfortunately you have to put a lot of effort into either figuring the whole thing out on your own or finding an expert that knows what they're doing.

                            I bought my 5 LNB dishes before D10 was launched. After it was operational I had a tech come out to readjust my dish for max reception of the new Sat. He wasn't even aware there was a new satellite. All he said was "that's cool".

                            When I had originally installed the dishes, they gave me a bunch of b-band converters. I asked them what are these for?, and he said "I don't know, they come with the dish".

                            It's a prime example of the "Buyer Beware".

                            Regards

                            Happy Bunny Day!

                            I'm eating something "Milk Chocolate" for lunch today!

                            Comment

                              #104
                              Re: VUDU vs Satellite

                              You guys are lucky. When I had my Dish Network hardware installed, on one of the trips the tech hung out in his van looking at Polish girlie magazines!

                              Comment

                                #105
                                Re: VUDU vs Satellite

                                Originally posted by NA9D View Post
                                You guys are lucky. When I had my Dish Network hardware installed, on one of the trips the tech hung out in his van looking at Polish girlie magazines!
                                Do you know if it was that issue where they showed her nude locked inside her convertable car??

                                It was a while back since I've seen it, so it may have been from the "Blondes 'R Us" rag.

                                Comment

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