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ONE FOR ALL SV9351 aerial "24dB High Performance"

  • 09-08-2016 8:29pm
    #1
    Antenna
    Registered Users, Registered Users 2 Posts: 2,360 ✭✭✭


    I noticed a local hardware retailer for some time selling a ONE FOR ALL SV9351 TV aerial, on the front of the box it proclaims "24dB High Performance" as well as a sticker assuring us that it works with Saorview

    I knew full well this was not possibly the gain of the aerial on its own. A UHF aerial approaching such a gain would be massive. So I wondered if it had a built-in preamp and so "24dB" total (aerial+amplifier) gain? but it transpired it didn't.

    Then looking at the back of the box in much smaller print I read that 24dB is in fact the Front-to-Back ratio, and a gain of "10-12dB" is stated for the aerial.

    Gain and F/B ratio are TWO DIFFERENT THINGS

    Front to Back Ratio would be a measure of rejection of interference arriving from directly behind the aerial compared to from the front of the aerial, however interference could of course be arriving from the sides of the aerial (or from under the aerial in the case of any interference from household electrical appliances) , quoting F/B ratio on its own as the performance of the aerial doesn't make too much sense.

    The main issue is that its really misleading putting the Front-to-Back ratio on the front of the box as if it were the gain of the aerial.

    Some websites of retailers selling this aerial are indeed stating the gain of this aerial as 24dB (or up to 24dB)

    do a search of retailers of this aerial and I see Harvey Norman and others quoting a gain of either 24dB or up to 24dB for this aerial.

    HarveyNorman.ie Description have "12dB-24dB Gain" for this aerial suitable for "HD Soarview". A New Zeland retailer says " Single boom ensures gain up to 24dB" !


Comments

  • #2
    byte
    Moderators, Regional North West Moderators Posts: 19,159 Mod ✭✭✭✭byte
    byte


    Is this it? Have to love their write up on how great it is!

    How much was it selling for?


  • #3
    winston_1
    Registered Users, Registered Users 2 Posts: 1,688 ✭✭✭winston_1


    In the UK you could report those dealers to the Advertising Standards Authourity who would hopefully sort it. Is there something similar in IRL?


  • #4
    Gerry Wicklow
    Registered Users, Registered Users 2 Posts: 4,568 ✭✭✭Gerry Wicklow


    It's the age old story like "HD aerial" or "Digital aerial". It does all that but so does any other similar aerial.
    BTW do you know it also prevents asteroid strikes? We haven't had one since they came on the market :D:D


  • #5
    byte
    Moderators, Regional North West Moderators Posts: 19,159 Mod ✭✭✭✭byte
    byte


    Just realised who started the thread, giving out about aerials! Apt :pac:


  • #6
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,596 Mod ✭✭✭✭Capt'n Midnight


    Antenna wrote: »
    Then looking at the back of the box in much smaller print I read that 24dB is in fact the Front-to-Back ratio, and a gain of "10-12dB" is stated for the aerial.
    Never mind that, how many elements did it claim to have ??


    "It's all weather proof up to IP55 level, 100% water proof. " , is that up to as in Broadband speeds ?


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