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  1. #1
    Junior Member Teacher
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    Default care este explicatia?

    Salutare la toata lumea.
    Iata care sint ipotezele:
    -antena Al simetrica, 1,80m, montura polara,actuator 24", lnb Gardiner universal 0,7dB-SUA vechi de 4-5 ani, cablu coaxial RG 6U de 25m, priza TV-Sat in camera (deci o innadire cablu),cursa 90E-30W, Intelsat 1W, tp 12643 V, nivel semnal 75% pe Stong 4500.
    -antena Fe offset pozitie fixa, 0,9m, lnb Inverto 0,3db, cablu coaxial RG 6U de 5m, Intelsat 1 W, acelasi tp, nivel semnal 71%.
    Mi se pare mult prea mica dif de semnal intre cele 2 antene.
    Explicatii gasite de mine:
    -randament f bun pe 0,9m si mai putin performant pe 1,80m
    -pierderi de semnal datorita diferentei de lungime cable intre antene(se merita sa pun amplificator liniar pe cablu de 25m?)
    -lnb Gardiner pt offset(are feed in pilnie) cu zgomot mai mare
    -pilonul la antena 1,80m nu e perfect vertical,e inclinat usor spre nord
    Daca aveti alte explicatii sau sugestii va rog sa imi raspundeti.
    Multumesc anticipat.

  2. #2
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    Default

    LNB+innadirea de cablu+reglaj necorespunzator .

  3. #3
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    Default

    Quote Originally Posted by ********* View Post
    LNB+innadirea de cablu+reglaj necorespunzator .
    + stalp sustinere INCLINAT ! pai in principiu daca orientezi antena bine si stalpul este perfect drept + un LNB de 0.3 sau 0.4 ar trebui sa vezi o mare diferenta la receptie .
    VA MAI AMINTITI ?


  4. #4
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    Default

    - orice inadire inseamna o pierdere de minim 1-2 dB
    - intre doua LNB-uri pot fi diferente de 4-5 dB in amplificare ( valoare tipica 54-56 ...dar la cele mai bune 59-60dB )
    - esentiala ramine totusi calitatea semnalului

  5. #5
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    Default

    elimina si doza !

  6. #6
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    Default diferenta semnal

    Multumesc pentru raspunsuri.Voi urca pe terasa blocului cu tv si receptor si voi folosi acelasi cablu de 5m pt a vedea cit de mare e diferenta de semnal.Voi misca si antena cu mina pt a vedea daca mai cere o corectie de reglaj.

 

 

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