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  1. #1
    Junior Member Teacher
    RDI - Board Default Avatar

    Join Date
    Oct 2003
    Location
    Iasi, Romania
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    211
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    Default lnb 0.6 - lnb 0.3

    va rog si eu daca stiti mai mult sa explicati si pt noob de eu care e concret diferentza la lnb de 0.6 si 0.3...cu 0.3 e semnal mai puternic sau ce anume influenteaza chestia asta ?
    danke
    1.2 Fe offset,SRT DM2100,Invacom 0.3 dB - twin,Pearl Edition Single LNB 0.3 dB * 2, ss2 rev 2.6d + DVB3 715 2 CI ,0.9 Fe offset,Samsung 0.6 dB * 2, DiGi TV, SkyStar USB [ 47.15 N - 27.63 E ]

  2. #2
    adriancon
    Guest
    RDI - Board Default Avatar

    Default

    Un lnb est un dispozitiv de conversie a semnalului din satelit de la 11 - 12 GHz la 900 - 2000 MHz si ca orice convertor / amplificator are un factor de zgomot care se masoara in db. In prezent s-a ajuns la 0,3 - 0,6 db
    pentru convertoare si preturile sunt cam 10 - 50 euro.
    O reducere a zgomotului de la 0,6 la 0,3 ar fi echivalentul reducerii
    diametrului de receptie al parabolei cam de la 1,2m la 0,9 deci cam 3db
    castig in raport / zgomot daca mentii aceeasi parabola.

    Regards,

  3. #3
    Member Mentor
    Join Date
    Dec 2003
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    979
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    Default

    Salut,
    Zgomotul lnb-ului e o chestiune foarte importanta,e necesar sa fie cat mai mic.Trebuie tinut cont insa ca zgomotul spatiului (adica modul in care unda de la satelit e perturbata natural) e cam de 0,4 dB=> teoretic nu prea poti avea un lnb sub aceasta valoare.Aia care zic ca au 0.3 sau -mai nou, 0.2dB, au, de fapt o amplificare mai mare.

    Oricum, principiul e simplu:
    Zgomot mai mic la lnb=calitate mai buna la receptie.
    Noroc
    Multumesc,
    Scorpio


    VU+ Solo 2/ parabola 1,8m / offset 1.85m / Bucuresti

 

 

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