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Thread: AGC si SNR

  1. #1
    Junior Member Teacher
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    Default AGC si SNR

    La mine, pe un DM500 (Gemini 3.4), fie ca sunt fixat pe un satelit fie ca nu, valorile lui SNR si AGC sunt de peste 60%. Se poate rezolva cumva, sa inceapa si valorile astea de pe la 30-40% cand am semnal ca asa e destul de greu sa fac niste reglaje mai fine(m-am ghidat doar dupa BER).
    1.4 Al, 0.3 dB, Pozitioner Moteck+12",SS2,62E<->30W
    Parabola 2.2 m, Lnb Inverto 0,3 dB, Actuator 24", V-Box 2, VU+UNO, DM500S, BR-6574N Router
    1.15 Fe, 0.2 dB Maximum, HH SG 2100 (de vanzare)

  2. #2
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    NU sunt peste 60 , sunt intre 40 si 55 la lipsa de semnal . Semnal util la un FEC de 3/4 doar de la un SNR de 66 in sus . Rezolvare nu este .

  3. #3
    Târnacopist Expert
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    Ai zgomot de fond pe cablu! Fie cablul nu e de cea mai buna calitate, fie e prea lung, fie trece prin apropierea unei surse puternice de radiatii electromagnetice (motoare electrice, site-uri emisii GSM etc). Alte puncte de atentie ar putea sa mai fie LNB-ul sau chiar tunerul dreamului dar e mai putin probabil.
    Incearca o impamantare de calitate a receiverului, s-ar putea sa rezolve partial problema.

  4. #4
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    Cablul are doar 15m si zic eu ca e de buna calitate (15000lei/m). Am SNR de 60 si AGC de 80 la lipsa de semnal. O sa incerc si cu un alt receiver sa vad daca se mentine problema.
    1.4 Al, 0.3 dB, Pozitioner Moteck+12",SS2,62E<->30W
    Parabola 2.2 m, Lnb Inverto 0,3 dB, Actuator 24", V-Box 2, VU+UNO, DM500S, BR-6574N Router
    1.15 Fe, 0.2 dB Maximum, HH SG 2100 (de vanzare)

 

 

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