Unul din elementele de baza ale unui echipament de emisie-receptie il constituie mixerul. Acestuia i se impune mai multe conditii printre care se numara: echilibrare mai buna de 25 … 30 dB, liniaritate, intermodulatie mica, etc.
Majoritatea firmelor specializate in echipament radio utilizeaza mixere dublu echilibrate cu diode. Daca diodele pot fi selectate pentru a avea parametri aproape identici, la realziarea transformatoarelor sunt necesare unele precautii.Montajul prezentat in continuare se realizeaza cu toruri de ferita de radiofrecventa. Toate infasurarile au cate 8 spire, de preferinta din lita de radiofrecventa isolate cu email si matase. Lucrul cel mai important il constituie modul de interconectare al celor 3 seciuni ale fiecarui transformator. Punctele de pe schema marcheaza inceputurile infasurarilor. R1, R2 si R3 sunt neceare pentru adaptare.
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Montajul prezentat in continuare se realizeaza cu toruri de ferita de radiofrecventa. Toate infasurarile au cate 8 spire, de preferinta din lita de radiofrecventa isolate cu email si matase. Lucrul cel mai important il constituie modul de interconectare al celor 3 seciuni ale fiecarui transformator. Punctele de pe schema marcheaza inceputurile infasurarilor. R1, R2 si R3 sunt neceare pentru adaptare.
