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Genie "The Good Stuff" Discussion

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by Stuart Sweet, Oct 12, 2012.

  1. Rich

    Rich DBSTalk Club DBSTalk Club

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    I keep trying to put this stuff in an electrical context so I can understand it and I think that's how this got so confused.

    Rich
     
  2. harperhometheater

    harperhometheater Legend

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    It's not necessarily the cable that matters, it's the impedance. "Coaxial digital" audio signals are designed to work best on 75 ohm coaxial cables, the exact same ones used for composite video and each channel of a component YUV/YCbCr/YPbPr cable. The type of connector (RCA, BNC, F-type) just depends on what the manufacturer decides to use and doesn't matter a lick as long as they are also 75 ohm impedance. If they aren't then the signal "should" still work (like if you use the cheap throw in the box cables) but you will have signal issues like reflections, impedance mismatches, jitter, ghosting, etc. If those issues become too great for the decoding end to overcome then the signal will fail.
     
  3. Rich

    Rich DBSTalk Club DBSTalk Club

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    I couldn't do it. I put soldered jumpers on the other end and it just wouldn't work. It rang out correctly for continuity, for whatever that's worth. That was quite a while ago and I think it was an upscaling DVD player that only had a digital audio cable output on it.

    So, after going thru all that, I could have just used a composite wire? Geeze, that doesn't seem fair... :lol:

    Rich
     
  4. RunnerFL

    RunnerFL Well-Known Member

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    If S/PDIF is a 75ohm coax what is the standard RG6 we use for SAT signals?
     
  5. RunnerFL

    RunnerFL Well-Known Member

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    You could have used composite, yes, but there's no guarantee you would have had great audio. :lol:
     
  6. harperhometheater

    harperhometheater Legend

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    75 ohm as well. RG6 is a cable designed for higher frequencies than low level audio and video interconnects, but should still work. That's why they have quad shield RG-6 because at higher frequencies the cable starts acting like an antenna and starts radiating the signal out of the dielectric and shielding, I.e. skin effect. This is exactly why there is indeed some differences in cheap vs well designed and constructed cables like JPS Labs, Monster, etc. but of course they go overboard with their claims and prices and if you look hard enough will find affordable well made and designed cables elsewhere (monoprice, blue jeans, etc.)
     
  7. harperhometheater

    harperhometheater Legend

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    Yes it would have been, IF the cable was designed correctly at 75 ohms impedance! Composite video cables and digital audio cables are EXACTLY the same.
     
  8. Mike Bertelson

    Mike Bertelson 6EQUJ5 WOW! Staff Member Super Moderator DBSTalk Club

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    I took the three wire cable with the yellow/white/red connectors (standard composite video, R/L audio cable) and used it to connect digital coax to my A/V system. It's nothing special and it works great. The yellow composite video is a 75Ω coax cable with RCA connectors.

    Mike
     
  9. Laxguy

    Laxguy Honi Soit Qui Mal Y Pense.

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    That kinda tops it up! So the word "digital" is market speak, and there's no difference between a well made "analog coax" and a so called "digital coax."
    Interesting discussion none-the-less.
     
  10. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Exactly true. Just like there is no such thing as a "digital" tv antenna, or an "HD" tv antenna. All market speak.

    A rose by any other name is still a rose.
     
  11. harperhometheater

    harperhometheater Legend

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    And so is a turd :D
     
  12. jangell2

    jangell2 Godfather

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    Ok, now you're gonna tell me those "HD" sunglasses that were being sold on TV aren't really high definition? :lol:
     
  13. Laxguy

    Laxguy Honi Soit Qui Mal Y Pense.

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    The ones that are digital are.....:D
     
  14. jangell2

    jangell2 Godfather

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    Got a question about the two 90 minute buffers. My HR20 constantly kept one buffer going, no matter it was in stand-by mode or not. It seems the HR34 does not. When I start it up in the morning, there is no buffer, is this the designed behavior?
     
  15. RunnerFL

    RunnerFL Well-Known Member

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    Some may lead you to beleive it's designed behavior and the rest of us think it's a bug. Sometimes there is a buffer, sometimes there is not. If what we are seeing is designed behavior then there should never be a buffer at all.
     
  16. jangell2

    jangell2 Godfather

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    What I would have liked to see was a user selectable period of time in which a buffer would not be kept. Let me choose between the hours of 11pm-7am to not carry a buffer. The idea being to cut down on the HD drive activity and increase it's lifespan and reliability.

    When no buffer is being kept, do we know what the HD is doing, is it spinning down or constantly running?

    I'm going to pay closer attention, but so far, I don't think I've ever seen a buffer in the morning.
     
  17. jangell2

    jangell2 Godfather

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    An update to my using the DTV remote for the HR20 and the Harmony for the HR34. Whenever it would use the Harmony to go from the HR20 to HR34, everything was fine, the HR34 powered on...and then it would shut off.

    I was really perplexed about this until I realized the Harmony was attempting to shut of the HR20 (it couldn't, its on RF) but was succeeding in shutting off the HR34 which was not a desirable behavior when trying to watch the HR34.

    So I updated to the remote to leave the HR20 on and now it get the results I want.

    It was a Homer Simpson "Doh!" moment. :)
     
  18. dennisj00

    dennisj00 Hall Of Fame

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    Hard drive activity has very litte effect on the life of the hard drive. Power cycles, extreme temperatures or mechanical shock are far bigger factors in hard drive life.
     
  19. RunnerFL

    RunnerFL Well-Known Member

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    Spinning a drive up and down is more wear and tear on the drive than just letting it spin 24/7.
     

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