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Digital Filter for UHF Aerial ?

  • 04-03-2009 12:54am
    #1
    Closed Accounts Posts: 18,163 ✭✭✭✭


    I have a Sky box connected to other rooms via the Sky Eye + a distributor in the attic. The UHF aerial is connected too, to allow 1,2,3 & 4 to be viewed independently of whatever's on Sky.

    At Christmas, some snow started to appear and the installer told me to disconnect the UHF aerial as the digital tests were interfering. I did this, and it was perfect, and I reconnected it 2 weeks afterwards - all fine again.

    That snow reappeared this week, and I've just disconnected the UHF aerial again to get a good picture back, which it did.

    It'll do for the moment, because there's rarely a need to watch 2 channels. But is there a filter that I could put somewhere that would prevent this ? It'd need to be relatively cheap, considering that the digital signal will be required in 2012 or whatever.....

    TIA for any help.


Comments

  • Registered Users, Registered Users 2 Posts: 11,341 ✭✭✭✭Tony


    Did you try changing the RF out channel on the sky box?

    Desktop PC Boards discount code on https://www.satellite.ie/ is boards.ie



  • Closed Accounts Posts: 18,163 ✭✭✭✭Liam Byrne


    Thanks Tony - yup, thought of that this time around and changed it from the initial install of 22 to 36, and it did improve matters but it's still poor enough while the UHF aerial is plugged in.

    Note that this is happening on ALL the channels, not just the Sky RF channel...i.e. UHF pics for 1-4 were fine for ages and they're getting interference as well.

    The only thing that improves the matter is actually removing the UHF aerial from the loop completely - that gives me absolutely perfect reception on the Sky RF channel.

    UHF aerial is a good few years old, so it's probably more susceptible to interference, but wouldn't mind a quick fix via an inline filter, if there's one available ?


  • Registered Users, Registered Users 2 Posts: 11,341 ✭✭✭✭Tony


    This may well be overload, what signal level did your installer measure on the UHF aerial ?

    Desktop PC Boards discount code on https://www.satellite.ie/ is boards.ie



  • Closed Accounts Posts: 18,163 ✭✭✭✭Liam Byrne


    Tony wrote: »
    This may well be overload, what signal level did your installer measure on the UHF aerial ?

    Didn't go through that with him; it's installed almost a year, and the problem wasn't there when it was installed - it only showed up at Christmas and when I rang him he mentioned that digital tests had started and to unplug the UHF aerial for a week or two.


  • Closed Accounts Posts: 474 ✭✭Sam Radford


    Liam Byrne wrote: »
    At Christmas, some snow started to appear
    It snowed in England, too. It was quite deep in places.

    You can use an aerial diplexer as a filter. Which channels do you want to filter out?
    See examples: http://www.satcure.co.uk/accs/page11c.htm#diplex


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  • Closed Accounts Posts: 18,163 ✭✭✭✭Liam Byrne


    It snowed in England, too. It was quite deep in places.

    Ba-dum - kish! :D Had thought of that pun but the only snow we've had here was today!
    You can use an aerial diplexer as a filter. Which channels do you want to filter out?
    See examples: http://www.satcure.co.uk/accs/page11c.htm#diplex

    Not so much "channels" as just the interference.


  • Registered Users, Registered Users 2 Posts: 11,341 ✭✭✭✭Tony


    I would try a variable attenuator on the aerial feed before going down the filter route.

    Desktop PC Boards discount code on https://www.satellite.ie/ is boards.ie



  • Closed Accounts Posts: 474 ✭✭Sam Radford


    Liam Byrne wrote: »
    Not so much "channels" as just the interference.

    Yes but which channels do you want to free up for your own internal use? You have to look at what channels you definitely want to receive then choose a group (preferably at the top or the bottom of the UHF band) that you want to filter out so there's no noise on them. You can then use one or more channels in that group for Sky etc.

    See http://www.The-Cool-Book-shop.co.uk/piping_tv.htm


  • Moderators, Regional North West Moderators Posts: 19,159 Mod ✭✭✭✭byte
    byte


    Mod: Thread moved to Terrestrial, as it has more to do with that, than satellite.

    Have you a masthead amplifier? Sounds to me either the masthead amp is being overloaded with noise thanks to DTT signals, or the Sky box modulator is being swamped, but excessive levels coming in (in this situation, use a variable attenuator as Tony says).

    Can you plug the aerial feed directly into a TV to see what happens?

    It would be possible to use a filter on the aerial, but perhaps only feasible if DTT and analogue frequencies weren't mixed between each other.

    EDIT: Watty has mentioned on another thread too, that an attenuator would be needed. They're cheap, so worth trying that first.


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