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    FreeSat versus FreeSat from Sky

    This is a discussion on FreeSat versus FreeSat from Sky within the Freesat forums, part of the Sky & Sky+ TV category; Originally Posted by Scubbie Communal dishes use a different set up to what someone like myself would have. The system ...

    1. #11
      dms05's Avatar
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      Re: FreeSat versus FreeSat from Sky

      Quote Originally Posted by Scubbie View Post
      Communal dishes use a different set up to what someone like myself would have.

      The system I have has 4 ports on the LNB. There are Octo-Port LNBs, but again the communal dish will have a different system entirely.

      There are some members who can give you more information on this.
      You only need a a small number of LNB outputs. These are fed to a Distribution amplifier which in turn feeds the signal down the existing twin cables to each dwelling. It's a very specialist set up and needs professional help if any changes are to be made. I'm sure the block's management company will be responsible for the distribution system and will be the people to arrange alterations.

      LNB Distribution to Multiple Satellite Set-boxes.
      A satellite Distribution system is best used where there may be more than four receivers and a Quad LNB can be expanded by a suitable Multiswitch system to give 16 to 2000 outlets.

      The central aspect is a "Multiswitch" connected via up to 50m (or more with line amplifier) directly to LNB IF in of the receiver.

      A distribution system needs better initial signal to noise, so if a single dish is used then 90cm to 1200cm (or larger for edge of footprint signals). Also since more receivers are using it, why scrimp on dish size especially on an Apartment, Hotel or other communal system?

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      Scubbie (19-11-12)


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      seawright is offline Sky User Member
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      Re: FreeSat versus FreeSat from Sky

      Quote Originally Posted by bryan View Post
      Thanks Scubbie, I'm reasonably familiar with most of that but what intrigues me is how they supply 53 flats with twin feeds, I'm assuming every flat here has twin Sky feeds, there obviously isn't 106 LNBs but there must be a lot of wires coming down the inside of the building from the roof.
      There are four possible groups of channels that can be output from an LNB, which group is fed down the cable depends on selection signals generated in the Sky stb. Where a large number of flats are to be fed from one dish a special type of lnb called a quattro lnb is used which outputs each group on a different cable. This is normally combined with a 5th cable from a terrestrial aerial so five cables feed distribution points around the development from where multicouplers feed the correct group of channels via cables to face plates in each dwelling using the normal selection signals from individual stbs.

      The latest system in large developments use a single fibre optic cable from the antennae to the first distribution point (DP), each subsequent DP being daisy chained off the previous one again using fibre optics.

      Thank you dms05:
      Ok for multicoupler read Multiswitch in my description above. Other than that I was just trying to keep the explanation simple.

     

     
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