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35
6. Montati sustinatorul microfonului in partea dreapta a dispozitivului, sau langa el
folosind doua suruburi.
Cand montati intr-un automobil, pozitionati sustinatorul sub linie pentru ca
microfonul sa fie usor de folosit.
ANTENELE CB
Din moment ce puterea maxima de iesire admisibila a transmitatorului este limitata de
FCC, antena este un important factor care afecteaza distanta transmisiunii. Doar un
sistem de antenna potrivit ca permite puterea maxima de transfer de la 50-ohmi linia de
transmisie la elemental ce radiaza. In instalarile mobile ( masini, camioane, barci) un
sistem de antenna care este non-directionat ar trebui folosit.
Un polarizat vertical, sferturi de lungimi de unda ale antenei obtine cea mai buna gama.
Cel mai scurt, tipul de incarcat antena tip bici este mai atractiv, compact si adecvata
pentru aplicatii unde distanta maxima posibila nu este necesara.
De asemenea, acest model nu reprezinta problema inaltimii impusa de sferturile de
lungimi de unda.
Antenele mobile “whip” utilizeaza baza de metal al vehiculului ca impamantare. Cand
monatati intr-un colt al vehiculului ele sunt putin directionate, in directia caroseriei
vehiculului. Pentru toate propunerile practice, oricum, modul; de radiatie este
nondirectional.
Caracteristicile directionarii usoare vor fi observate numai la distantele foarte mari. Un
conector standard al antenei ( scrie SO-239) este prevazut pe transmitator pentru o
conectare usoara la terminatie de cablu standard Pl 259.
Antena Supernova de tipul “loaded” – modele: ATW-500, AT-55, ATW-1000 and
ATW-400 sunt foarte recomandate pentru majoritatea instalarilor. Consultati
distribuitorul Supernova pentru mai multe detalii.
Cand instalati intr-o barca, transmitatorul nu va opera la eficienta maxima fara o
impamantare. Doar daca vasul are o carena de metal.
Inainte de a instala transmitatorul intr-o barca consultati furnizorul pentru detalii cu
privire la electroliza intre fitingurile din carena si apa.
3 cai prevazute de antenele combinate sunt disponibile care permit operatiuni pe
3 benzi: AM, FM si CB), folosind o singura antena.
Utilizarea acestui tip de antena rezulta mai putin decat o transmisie normala si gama
receptoare cand compari cu un tip standard “ Antena cu o singura banda” (CB).
Inlaturarea interferentelor zgomotoase
Utilizarea unui receptor mobil la semnal slab e limitat normal prin prezenta zgomotului
electric.
Sursa primara a zgomotului in automobile la instalare e de la alternator si de la sistemul
36


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