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M Zero Plus Manual de utilizare | 7
ANTENA
Antena este elementul cel mai important pentru obtinerea celor mai bune rezul-
tate. Antena utilizata trebuie sa aiba impedanta 50 Ohmi. In functie de pozitia in
care este instalata, randamentul variaza considerabil. Utilizati un cablu coaxial cu
impedanta tot de 50 ohmi, cum ar fi RG58U pentru lungimi de pana la 2.5 m sau
RG8 pentru lungimi mai mari. Cablul trebuie montat cu multa grija: evitati curba-
rea sau indoirea lui. De asemenea, trebuie retinut ca, un cablu mai scurt mareste
sensibilitatea statiei.
Sugestii
Instalati antena in cel mai liber si mai inalt punct al autovehiculului.
Antena trebuie instalata in pozitie verticala, si asa trebuie sa ramana pe toata
durata utilizarii.
Instalati antena cat mai departe de sursele de zgomot.
Masa antenei trebuie sa fie pe o suprafata de cel putin 1 mp.
Lungimea antenei este direct proportionala cu eficienta acesteia. In general, cu cat
este mai lunga, cu atat va fi mai eficienta Puteti monta antena in mai multe pozitii
pe autovehicul:
Motare pe cupola: In aceasta pozitie antena va radia in mod egal in toate directiile.
Deoarece antena cu spicul de 1/2 lungime de unda este prea lunga pentru montarea
pe cupola, aceasta trebuie scurtata putin pentru a obtine performante optime.
Montare pe capota: Directia radiatiilor va fi putin mai mare spre spatele masinii,
in directia opusa montarii antenei. Totusi, montarea pe capota va ofera avantajul
montarii si demontarii usoare a antenei.
Montare pe portbagaj: Directia radiatiilor va fi putin mai mare spre fata masinii, in
directia opusa montarii antenei. In aceasta pozitie va recomandam utilizarea unei
antene putin mai lungi.
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