Performantele unui echipament radio depind in mare masura de calitatile oscilatorului local variabil (VFO).
Schema din fig. 1 este destinata benzii de frecventa 3,5 … 3,8MHz. Contine 3 tranzistoare de tip BC 107 si se alimenteaza de la o sursa de 72Vc.c.Inductanta L contine 12 spire din CuEm de 0,3mm si se bobineaza pe un miez oala de F.I (470 KHz). Socurile de RF se realizeaza pe miezuri drepte de ferite si contin cate 50… 80 spire din CuEm de 0,12mm.
In fig. 2 se poate urmari cablajul imprimat, iar in fig. 3 modul de plantare a componentelor.
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