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Barrel connectors

Discussion in 'DIRECTV Installation/MDU Discussion' started by TAK3210, Dec 17, 2011.

  1. P Smith

    P Smith Mr. FixAnything

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    I would say - avoid such use [barrels] outdoor especially for wet/moisturized places and you'll have no issues for inside use of those.
     
  2. TAK3210

    TAK3210 Legend

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    OK, I've decided to use Type N connectors. :lol:
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    better make sure it's a 75Ω Type N or "you'll be in trouble".
    I worked somewhere where they had both 50 & 75Ω Type N connectors and you wouldn't believe the idiots that would destroy them by mixing them up. :eek2: :nono2:
     
  4. TAK3210

    TAK3210 Legend

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    No, I was just joking. I'm not going to do anything that makes this project any harder. :)
     
  5. harsh

    harsh Beware the Attack Basset

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    In early 2003, the Consumer Electronics Association established standard CEA-897 for color coding of F connectors. At the time, it was hailed as a breakthrough for satellite TV users as a way of insuring the suitability of connectors for various purposes and identifying which cable goes where.

    http://www.appliancemagazine.com/news.php?article=4229&zone=0&first=1

    From a 2005 Echostar hardware specification guide:
    The color of the dielectric should most certainly be meaningful but opinions aren't required to be influenced by the existence of standards.
     
  6. bobnielsen

    bobnielsen Éminence grise

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    It might be interesting to see what CEA-897 has to say, but I'm not about to spend $51 to find out.
     
  7. P Smith

    P Smith Mr. FixAnything

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  8. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    You too, huh?
     
  9. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    So, CEA established a color standard intended to make consumers in home television system installations better informed, but nobody can find out what it says unless they spend $50+. That sure does make sense (not!).

    The color palette appears to include flourescent green, white, black, flourescent yellow, purple and flourescent blue. But what each color means (per CEA criteria) can't be known without buying a copy of the standard.

    Further, while retailers sometimes say "complies with CEA-897", they don't say anything further, like what part of CEA-897 or what specific purpose a connector is intended for.

    With all due respect, this appears to be a totally useless specification. At least to the consumer in the home environment, for which it is intended to benefit.

    Allow me to also apologize for my earlier post where I indicated I couldn't find any color specification. It seems there is one, but it was so buried in obscurity that a fairly thorough Google search failed to stumble upon CEA-897, further indication of it being a useless specification (for the home television consumer).
     
  10. DarkLogix

    DarkLogix Godfather

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    Don't you just hate standards that you have to pay to conform to

    having to pay to get the info on the standard really makes it a non-standard
    I could understand if it were something very complex with the possibility of making a computer crash(like some standard way to initialize a PLC but then you'd get that when you buy the gear) if not followed but for something thats ment to improve quality such as that one is ment to should be plastered all over the place and as easy to find as the EIA/TIA-568-B or A standards
     
  11. WestDC

    WestDC Well-Known Member

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    The Blue Barrel D* connectors were swept to 3 gig's. The Orange Connectors (color change) Was implemented by a change of Mfg (supply) and as way to ensure (on new installs & Service calls) that all connectors are being changed out to ensure quailty of service. Also a easy way to deduct from the installers pay (by sight) rather than inspection by HSP's.
     
  12. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "Give me a break", I didn't just fall off the turnip truck.
    They aren't connected to a network analyzer and measured.
    "Swept to 3 Ghz", well I could do that to an AC wall plug too. It wouldn't mean squat unless I published the results.

    [OK, I'm now getting back on the truck :lol:]
     
  13. WestDC

    WestDC Well-Known Member

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    That's the same truck that supply's the install & training manual's to the HSP's (FYI) ;)
     
  14. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "And the trainers come into town on" !rolling
     
  15. DarkLogix

    DarkLogix Godfather

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    I think with barrels the only thing they can realisticaly do is do better engineering and test a sample

    if some engineer sees a way that atleast in theory would improve the connection/lower ingress, egress/have some other improvement that they think of it might or might not even be in the measurable range but then they can still know its better

    ie if you were to use a 12 gauge power cord on a computer that normally only has a 16 gauge one well you know that technicaly theres less voltage drop but on such a short piece the amount is likely not worth measuring, its better but you will have a hard time proving it via testing
     
  16. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    F81 "specs" from a [Asian] manufacturer:
    Often little thought is given to F-81 used and things to tend to work as expected. Satellite systems in particular, use high frequency signals. As satellite services increase offerings, so too does the bandwidth of the satellite system to transport there services. As bandwidth is increased, higher frequencies are employed to transport additional video channels and this challenges the integrity of the F-81 connector.

    • High quality, digital broadband performance to 3GHz
    • 360 degrees round seizing pins maximize center conductor surface contact thereby significantly reducing contact resistance
    • Reduced aperture flat-ended ports on both ends comply to SCTE IPS-SP-406 standard to maximize connector shield to connector surface contact and reduce moisture migration
    • Return loss over -30dB up to 1GHz exceeds SCTE return loss standard
    • Less than 0.05dB insertion loss typical to 1GHz provided unsurpassed performance in digital environments
    • All facilities meet ISO 9001 standards
    Bold is my addition


    Since a ground block is basically the same as a F81 barrel, these should give some idea of the loss, as they're listed for a "blue" ground block:

    Insertion Loss:

    5 to 1,200MHz ≤ 0.2dB

    1,201 to 2,500MHz ≤ 1.5dB

    It also has the "boilerplate":
    • High quality, digital broadband performance to 3GHz
    • 360 degrees round seizing pins maximize center conductor surface contact thereby significantly reducing contact resistance
    • Reduced aperture flat-ended ports on both ends comply to SCTE IPS-SP-406 standard to maximize connector shield to connector surface contact and reduce moisture migration
    • Return loss over -30dB up to IGHz exceeds SCTE return loss standard
    • Less then 0.05dB insertion loss typical to IGHz provided unsurpassed performance in digital environments
     
  17. harsh

    harsh Beware the Attack Basset

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    Kind of like having to hire an accountant to do your taxes. Its all about revenue.
     
  18. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Insertion Loss:

    5 to 1,200MHz ≤ 0.2dB

    1,201 to 2,500MHz ≤ 1.5dB

    I don't have enough data point to plot the rolloff of these "3 GHz swept" connectors, but they rolloff faster than RG59 :eek2:

    At 1,200 MHz they have the same loss as 2' of RG59 [or 3' of RG6],
    but at 2,500 MHz they have the same loss as 12' of RG59 [or 14' of RG6]
     
  19. Manctech

    Manctech Icon

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    Who knew barrels could be so exciting!
     

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