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  1. 24-07-08, 20:49 #1
    genugeo85
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    Default Zgomot lnb

    Deschid acest thread cu intentia de a discuta pe tema zgomotului unui lnb, despre care unii producatori spun ca ar ajunge la 0,1-0,2 dB... In teorie zgomotul e dat de etajul de intrare, in practica si celelalte etaje induc zgomot. Ori, chiar si cele mai performante tranzistoare HEMT au zgomot de minim 0,45 dB! Iar la acesta se mai adauga si zgomotul indus de celelate elemente de circuit! Gasiti aici un exemplu de amplificator si tranzistor HEMT: http://www.rfmicrowave.it/schede/_pdf/SU-02_01.pdf
    Iar aici: http://www.rfmicrowave.it/schede/_pdf/SU-01_01.pdf gasiti foto ale interiorului unui TV Sat converter...
    Last edited by genugeo85; 24-07-08 at 20:54.
    Var cu Adolf, frate cu Iosif, prieten cu Kim
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