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SNR and AGC, can anyone explain?

  • 08-02-2014 09:14PM
    #1
    dnme
    Registered Users, Registered Users 2 Posts: 3,429 ✭✭✭


    When considering a DVB-T signal, what signal to noise ratio and auto gain control values are we looking for? High or low ?

    I'm currently looking at Saorview with
    SNR: 99% on RTE1 and 79% on the other saorview channels
    AGC averaging 5% on RTE1 and 14% on the other saorview channels.

    Are these figures good or bad? Am I looking for high or low figures? I've googled this, Wikipedia;d it etc. Read a few technical articles but still don't understand if my values are good or bad.

    Looking for simple answers here please. I'm snowblind with technical articles


Comments

  • #2
    The Cush
    Registered Users, Registered Users 2 Posts: 15,978 ✭✭✭✭The Cush


    Don't know what the % values represent on your receiver but the following would be used in conjunction with a professional signal meter

    2zhpkr5.jpg


  • #3
    Ronnie Raygun
    Closed Accounts Posts: 1,351 ✭✭✭Ronnie Raygun


    dnme wrote: »
    When considering a DVB-T signal, what signal to noise ratio and auto gain control values are we looking for? High or low ?

    I'm currently looking at Saorview with
    SNR: 99% on RTE1 and 79% on the other saorview channels
    AGC averaging 5% on RTE1 and 14% on the other saorview channels.

    Intuitively, you would expect a lower AGC figure to be better (means it's "working" less) & you have lower figures here now than you did at the start of your other thread, when things weren't looking so good on the TV itself.


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