Antena quad pe care am descris-o in amanuntime la capitolul anterior poate fi folosita cu acelasi succes si in banda de 144 MHz. Ne vom opri la antena quad cu…
Este formata dintr-un cadru dreptunghiular compus din doua semiunde, una Ia partea superioara a cadrului si alta la partea inferioara, alimentate printr-o linie compusa din conductoare paralele, a carei impedanta…
Este foarte utila pentru receptionarea unui spectru larg de frecvente in gama undelor ultrascurte, cu un cistig bun, ce creste odata cu frecventa. Astfel, incepind cu frecventa de 50 MHz…
Prezinta o banda larga de lucru si este formata din doua patrate, amplasate unul deasupra celuilalt, alimentate central (fig. 253 a) si excitate sinfazic. Antena radiaza unde electromagnetice polarizate orizontal.…
Este formata dintr-un conductor gros. rasucit in spirala, si seamana cu bobina unui radioemitator de putere. Dimensiunile sale sint determinate de frecventa de lucru. Diametrul spirelor se ia egal cu…
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