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Signal strength is 89% with quality 90% but still get picture breakup

  • 04-02-2012 4:02pm
    #1
    givecredit
    Registered Users, Registered Users 2 Posts: 1,654 ✭✭✭


    Signal strength is 89% with quality 90% but still get picture breakup. Using outdoor wideband aerial with masthead amp. Cairn Hill transmitter.

    Picture breakup usually occurs about 1-4 times a night lasting about 5-10 sec. Raised Aerial, Changed all cables and changed saorview receiver, But still no success. Any advice appreciated..


Comments

  • #2
    SalteeDog
    Registered Users, Registered Users 2 Posts: 450 ✭✭SalteeDog


    Strictly amateur advice - but you may be picking up interference from central heating, washing machine, gas hob piezoelectrics etc. or something your neighbors are doing.


  • #3
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    Interference pickup.
    Try without mast amp or a professional "grouped" amp with F-connectors.

    Better still is correct group Aerial with more gain and no amp.

    Wideband aerial and mast amp is a recipe for overload and interference.


  • #4
    givecredit
    Registered Users, Registered Users 2 Posts: 1,654 ✭✭✭givecredit


    Thanks for the advice. All this time trying to increase quality when it could be local interference... Before removing amp I might try turning down amplification. This might kill interference.

    Using High Gain UHF Grid Aerial and FTE Maximal M1001 amplifier. Feeding 4 tvs.

    What % is reliable signal quality?


  • #5
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    It depends what it means, how the set measures it, over 75% is usually not a problem.

    There is no such thing as a "high gain grid" aerial. They are four dipoles and a reflector. Unless each bowtie is a mini-yagi.

    Unless the attenuator is on the input of amp, it won't help. Also unless it's a Professional F-connector group Amp, it will suffer badly from interference.

    [Edit : corrected typo]


  • #6
    SalteeDog
    Registered Users, Registered Users 2 Posts: 450 ✭✭SalteeDog


    One other thing. From my own experience, use of standard coax sockets and crappy thin coax cable to connect the socket to the TV doesn't help. I found a 6 to 10% improvement in signal quality in replacing the sockets with F-Connector terminations and replacing the cables with decent RG6. I couldn't replace the cabling in the walls but if I could do so easily I would.


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  • #7
    givecredit
    Registered Users, Registered Users 2 Posts: 1,654 ✭✭✭givecredit


    watty wrote: »
    Interference pickup.
    Try without mast amp or a professional "grouped" amp with F-connectors.

    Better still is correct group Aerial with more gain and no amp.

    Wideband aerial and mast amp is a recipe for overload and interference.

    Ok, I have removed mast amp. Signal 82% Quality 90%. Unfortunately interference still there, No improvement. Seems to be at its worst from 6.00pm onwards. Little or non in afternoons.

    I need a group B aerial for Cairn Hill. Is there any you would recommend?

    How would this fare?
    http://www.tvtrade.ie/yellow-group-b-uhf-aerial.html


    Edit. Doing a bit of research on wattys great site

    http://www.techtir.ie/radio-tv/uhf-aerials

    The SR10 SR13 or SR18 seems the way to go...Anyone know where these can be bought?


  • #8
    Peter Rhea
    Banned (with Prison Access) Posts: 4,285 ✭✭✭Peter Rhea


    You'd be better off trying to identify the source of the interference, whether it be in your own house or a neighbour's. Could be a dodgy switch or pump in a heating system or something like that.

    I don't think changing the aerial will make much difference, to the best of my knowledge a grid would be one of the better designs (when horizontally polarised) for rejecting interference coming from a lower level.


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