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dab aerial on same mast as TV aerial

  • 24-09-2018 7:06pm
    #1
    soporific
    Registered Users, Registered Users 2 Posts: 52 ✭✭


    I had a cheap omni dab aerial on the same mast as the TV aerial and was getting most of the NI ensembles (along with rte ones) but with occasional burbling. So I "upgraded" to a Blake 3-element dab aerial. Two hours of up and down the ladder, my reception was poorer than it was. One more afternoon of experimenting made no difference. I gave up and put the old aerial back up - but a little closer to the TV aerial. The dab reception was fine once again - but the FM reception for the BBC went from good to horribly noisy. Could it be interference from the TV aerial? Could the poor performance of the 3-element aerial be from proximity to a UHF aerial?


Comments

  • #2
    winston_1
    Registered Users, Registered Users 2 Posts: 1,688 ✭✭✭winston_1


    Aerials can affect each other. Ideally they should be separated by around a metre on the mast.
    DAB signals use single frequency networks and signals from different transmitters combine. Using a 3 element directional aerial may stop this happening. Also what direction did you point it in? I assume NI and RTE are in different directions. Finally you did mount it vertically didn't you?


  • #3
    soporific
    Registered Users, Registered Users 2 Posts: 52 ✭✭soporific


    The distance apart was more than a metre on the mast but the reflector of the dab aerial looked close to the yagi uhf. I attached it vertically and directed at NI/dundalk which in east Meath is in the same direction. There's supposed to be a 30 degrees angle of acceptance which I guess should bring in all the transmitters. I took off the reflector and dipole to test and there was no difference in performance. It makes no sense that an aerial with a 3db gain should perform so badly compared to a omni.


  • #4
    soporific
    Registered Users, Registered Users 2 Posts: 52 ✭✭soporific


    One more oddity i've noticed which proves how dark an art aerial placement can be. My BBc Fm reception may be suffering from being closer to the uhf aerial but my dab reception has improved to the extent that I can now split it without burbles to two rooms, which I couldn't do previously. i'll take that as a win!


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