Calitatea unei emisiuni (SSB) radio depinde in cea mai mare parte de selectivitatea frecventei intermediare si deci a filtrului de banda ingusta utilizat.
Cu ajutorul a 6 cristale de cuart se poate realiza un filtru cu performante foarte bune daca se utilizeaze schema din figura 1. Caracteristica acestuia este ilustrata in figura 2.
Valoarea frecventei pentru cuarturile Q1, Q2 si Q3 este de 5500MHz iar pentru Q4, Q5 si Q6 de 5,5MHz ± 1500 …1700Hz.
Pentru bobine se utilizeaza miezuri drepte de ferita. L1 si L4 contin cate 50 de spire din CuEm de 0.15mm, iar L2 si L3 cate 60 spire din aceeasi sarma.
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