Supliment: 50 scheme electronice si montaje practice
In continuare se descrie un filtru trece-banda care poate fi utilizat atat la receptie cat si la emisie. Adaptarea se realizeaza pe impedante de 75Ω.
Inductantele se realizeaza din miezuri tip oala utilizate frecvent in etajele de frecventa intermediara ale receptoarelor industriale. Sarma poate fi CuEm sau CuEm + matase de 0.2…0.25mm. Schema din fig. 1 contine patru circuite rezonante LC. Cele marcate cu 1 si 4 sunt utilizate ca celula trece-banda; iar 2 si 3 ca filtre opreste-banda. Pentru acord se va utiliza un generator si un decibelmetru sau un osciloscop. Se va urmari ca acordul circuitelor rezonante sd se realizeze pe frecventele indicate in tabelul din fig. 2.
Datele bobinelor sunt valabile pentru miezuri cu inductata specifica AL=23. Asemenea filtre sunt deosebit de utile in cazul transceiverelor pentru filtrarea armonicilor la emisie sau a imaginilor la receptie.
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