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New Setup Diagram Help

  • 04-09-2009 11:06am
    #1
    HappyHarry
    Registered Users, Registered Users 2 Posts: 350 ✭✭


    Firstly thanks to all thoose that have helped in previous threads identifying Aerials and making suggestions for a setup in south west Wexford.:)

    I think I'm ready to make some purchases and get on the roof!

    To recap briefly: my plan is to get UK DTT from Presley and Irish DTT from Mount Leinster also getting whatever is available on UHF Analogue from Leinster direction at the moment.

    To begin with I'll purchase a single antenna and try it in both positions to test what is available, signal strenghts etc.

    Are the fllowing setup diagrams correct?

    1) Test setup, single TV and single Aerial.
    Triax SUPERGAIN 18W
    |
    Masthead Amp 26dB
    |
    Power supply
    |
    TV (note cable run from Power Supply to TV is about 25-30m.)

    2) Two aerials, 1 for Presley and 1 for Mt Leinster.
    A1 - MHA1 - PS1
    A2 - MHA2 - PS2

    PS1 & PS2
    |
    Combiner
    |
    TV

    3) Multiple TVs. If I add a second TV is this the correct way to do it?
    As item 2 until combiner then...
    Combiner
    |
    Distribution Amp
    |
    Tv1 & TV2

    As both aerials will be identical, just recieving different signals, what function does the combiner/ diplexer do? I mean above what splicing the cables together... showing my ignorance on the matter here...:o

    I assume it's best to use CT100 cable to join everything and f type connectors everywhere?
    Installation is so near the sea that salt spray will end up on the antenna in windy conditions, and special considerations for this?

    Any other advice you have for a newbie doing a DIY install is very welcome.


Comments

  • #2
    Mike 1972
    Closed Accounts Posts: 8,018 ✭✭✭Mike 1972


    As both aerials will be identical, just recieving different signals, what function does the combiner/ diplexer do?

    Cheaper ones just combine the signals but avoid the signal reflections/impedance mismatches one would get with just joining the cables

    More expensive ("Grouped") ones also contain filtering circuits to stop any stray RTE signals picked up on your BBC aerial (and vice versa) bleeding through and causing wierd ghosting and cross modulation (interference) problems.

    It may be possible to get away with one set of amplifier/power supply if you combine the signals before the amp or it may be the case that the RTE signals are strong enough in your area that you only need the amp for the UK channels.

    None of the setups make any provision for VHF reception from MT leinster (VHF is currently used for Analouge RTE1 and 2 and might possibly be used for additional DTT services in the future) but If you have RTE Digital you may not see the need for analouge (unless you need it for additional TV's video's etc) in any case the Analouge signals are due to be eventually (201?) turned off and there is no certainty that VHF will ever be used for DTT


  • #3
    HappyHarry
    Registered Users, Registered Users 2 Posts: 350 ✭✭HappyHarry


    Thanks for the reply.
    Mike 1972 wrote: »
    None of the setups make any provision for VHF reception from MT leinster (VHF is currently used for Analouge RTE1 and 2 and might possibly be used for additional DTT services in the future) but If you have RTE Digital you may not see the need for analouge (unless you need it for additional TV's video's etc) in any case the Analouge signals are due to be eventually (201?) turned off and there is no certainty that VHF will ever be used for DTT

    Yes VHF was deliberatly omitted. I need to do some investigations, but at the moment there appears to be very good RTE1 & RTE2 analogue reception and I haven't figure out where it's coming from but it's UHF. I know that Mt Leinster broadcasts then on VHF.

    I know DTT is still just in test mode, but have been using it almost exclusively in Dublin for a few months. It seems to be that RTE1 & 2 are the least affected (i.e. lost for periods of time) during the tests. And with UK DTT and analogue TV3 & TG4 on UHF i think i could live without 1 & 2 now and again. If DTT is turned off I might look into adding VHF.


  • #4
    Mike 1972
    Closed Accounts Posts: 8,018 ✭✭✭Mike 1972


    HappyHarry wrote: »
    at the moment there appears to be very good RTE1 & RTE2 analogue reception and I haven't figure out where it's coming from but it's UHF. I know that Mt Leinster broadcasts then on VHF.
    .

    If your TV tuning uses channel numbers you could identify the transmitter with the help of this list
    although for DTT if you can get a reasonably good signal from Mt Leinster its best to use it rather than a relay transmitter (they dont have DTT yet and are more prone to breakdowns)


  • #5
    HappyHarry
    Registered Users, Registered Users 2 Posts: 350 ✭✭HappyHarry


    Mike 1972 wrote: »
    If your TV tuning uses channel numbers you could identify the transmitter with the help of this list
    although for DTT if you can get a reasonably good signal from Mt Leinster its best to use it rather than a relay transmitter (they dont have DTT yet and are more prone to breakdowns)

    Yes, it does and I've seen the list.

    I think (channel numbers from memory) RTE1 and RTE2 are coming in on the Mount Leinster LP transmitter UHF CH29 and CH33. I need to double check later this week.


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