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Hi all, please see this major site announcement: https://www.boards.ie/discussion/2058427594/boards-ie-2026

DTT now broadcasting from Castlebar on UHF channel 22.

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Comments

  • #32
    Sponge Bob
    Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    I think the original plan ( 1950s) was VHF1 only and H/V polarisation with 625 lines = 6 combinations using the 3 x 7mhz channels that were available in VHF1. 6 combinations = 6 transmitters.

    They found they had to activate VHF3 for the 405 line transmissions in parallel with 625 lines or TV would not have taken off at all.


  • #33
    Galway
    Registered Users, Registered Users 2 Posts: 654 ✭✭✭Galway


    This discussion has now gone way off topic.


  • #34
    Mike 1972
    Closed Accounts Posts: 8,018 ✭✭✭Mike 1972


    watty wrote: »
    yes, it's barely possible, just. for only 1 channel and only 5 transmitters. Geography helps.

    Ignoring any UK transmitters -which wouldnt really have been a great idea

    Galway wrote: »
    This discussion has now gone way off topic.

    Fair point :o


  • #35
    Kristopherus
    Registered Users, Registered Users 2 Posts: 11,902 ✭✭✭✭Kristopherus


    godskitchen wrote: »
    What are UPC doing with it?

    As Watty said its for UPC's MMDS service. I had it installed last week (Bye,Bye, Sky:D:D:D). The installer got up on the roof and looked out the Glenisland direction. He explained that he was looking for their transposer. I said I thought theirs was on the Eircom mast. He said, no, theirs was beside the RTE mast.


  • #36
    Galway
    Registered Users, Registered Users 2 Posts: 654 ✭✭✭Galway


    Kristopherus wrote: »
    As Watty said its for UPC's MMDS service. I had it installed last week (Bye,Bye, Sky:D:D:D). The installer got up on the roof and looked out the Glenisland direction. He explained that he was looking for their transposer. I said I thought theirs was on the Eircom mast. He said, no, theirs was beside the RTE mast.

    None of this has has anything to do with the post title. Can it be locked?


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  • #37
    watty
    Registered Users, Registered Users 2 Posts: 32,461 ✭✭✭✭watty


    Mike 1972 wrote: »
    Ignoring any UK transmitters -which wouldnt really have been a great idea
    I'd assumed that who ever gave out the 3 channels had Co-ordinated with Wales, N.I. South West England/Cornwall etc.

    I didn't show polarisation. Two eastern ones would have polarisation to reduce interference to UK

    The Western ones with same channel then have opposite polarisation.

    O2, Meteor, Vodafone each only have 3 channels. These 12 channels are also used in N.I. Each has to build a National network with near 95% coverage
    yet not have interference with other cells. Each mast or cell typically has all 3 channels, each on a 120 degree or slightly wider beam so that adjacent pairs on same mast overlap slightly. ALL channels must use BOTH polarities H & V as phone aerials can be any angle.

    The VHF 5 TV transmitters, one program with 3 channels and single polarisation is easy compared to 3G radio or DTT :)


  • #38
    12 element
    Registered Users, Registered Users 2 Posts: 719 ✭✭✭12 element


    Galway wrote: »
    None of this has has anything to do with the post title. Can it be locked?

    Why does it bother you so much? It's still interesting. Let the moderators do the moderating!


  • #39
    givecredit
    Registered Users, Registered Users 2 Posts: 1,656 ✭✭✭givecredit


    12 element wrote: »
    Why does it bother you so much? It's still interesting. Let the moderators do the moderating!

    Well to be fair to "Galway" i too keep returning to this thread to read up to date info on Castlebar DTT, only to find people discussing unrelated topic. I think other forums refer to it as "thread hijacking" and its annoying.


  • #40
    watty
    Registered Users, Registered Users 2 Posts: 32,461 ✭✭✭✭watty


    No doubt when the Moderator(s) have time they will split the offending posts into a new topic.


  • #41
    godskitchen
    Registered Users, Registered Users 2 Posts: 1,846 ✭✭✭godskitchen


    To get back on topic.......

    If as has been suggested, all the "reflectors" will be gone by 2012, where for example will Castlebar get its signal from then? If it is from higher up the mountain at the large mast then why not just take the signal from there to begin with?


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  • #42
    12 element
    Registered Users, Registered Users 2 Posts: 719 ✭✭✭12 element


    godskitchen wrote: »
    To get back on topic.......

    If as has been suggested, all the "reflectors" will be gone by 2012, where for example will Castlebar get its signal from then? If it is from higher up the mountain at the large mast then why not just take the signal from there to begin with?

    What do you mean? I'd presume that Castlebar/Croaghmoyle gets its signal from one of the main sites via microwave link.


  • #43
    The Cush
    Registered Users, Registered Users 2, Paid Member Posts: 16,390 ✭✭✭✭The Cush


    godskitchen wrote: »
    To get back on topic.......

    If as has been suggested, all the "reflectors" will be gone by 2012, where for example will Castlebar get its signal from then? If it is from higher up the mountain at the large mast then why not just take the signal from there to begin with?

    Which signal, the Irish channels or the UK one's via the deflector?


  • #44
    12 element
    Registered Users, Registered Users 2 Posts: 719 ✭✭✭12 element


    I think the deflector gets the UK channels from a satellite box. It has nothing to do with the Croaghmoyle site.


  • #45
    STB
    Closed Accounts Posts: 5,178 ✭✭✭STB


    The Luas was late this morning.


  • #46
    Sponge Bob
    Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    The local news has the story and a well researched piece it is too. Fair play to the journalist/blogger who wrote it.

    http://www.mayotoday.ie/2010/08/23/rte-digital-tv-tests-in-mayo-signal-end-for-deflectors/-9671


  • #47
    The Cush
    Registered Users, Registered Users 2, Paid Member Posts: 16,390 ✭✭✭✭The Cush


    Sponge Bob wrote: »
    The local news has the story and a well researched piece it is too. Fair play to the journalist/blogger who wrote it.

    http://www.mayotoday.ie/2010/08/23/rte-digital-tv-tests-in-mayo-signal-end-for-deflectors/-9671

    I agree with that, good article. Better researched than some "experts" we have posted about recently.

    Including the brand names Saorview/Saorsat would have provided a reference for those new to DTT to learn more on the internet.

    Some might assume reading the article that once the deflectors shut down the UK channels would be available on DTT/Saorsat, a reference to freesat or free-to-air could have been included.


  • #48
    Sam Russell
    Moderators, Science, Health & Environment Moderators Posts: 20,584 Mod ✭✭✭✭Sam Russell


    Also the author might have mentioned that Freesat will allow free access to most UK TV services, removing the need to pay a subscription for TV services.

    Saoview = GOOD
    Saorsat = Good but not yet
    Freesat = Good
    Freeview = BAD
    Freeview HD = Good.


  • #49
    watty
    Registered Users, Registered Users 2 Posts: 32,461 ✭✭✭✭watty


    However while Saorsat isn't available at "Soft launch" Saorview only launch time, it seems likely that the "full public launch" is after Saorsat starts, unless Kasat fails.

    It should be emphasised that Freesat HD box or Freeview HD boxes don't need HD TVs and give all the channels. The non-HD versions don't.

    Saorsat and Saorview has "HD" boxes or TVs as the minimum. Again an actual HDTV is optional.


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