Pentru marirea sensibilitatii unui apparat ce receptioneaza in gamele UM, UL, US se poate construe un amplificatory dupa schema din figura de mai jos.
Antena poate fi de tip baston (telescopica) sau de orice alt tip.
Amplificatorul se realizeaza cu un transistor T tip npn cu siliciu (tipul BF214, BF215, BF254, BF255, BF173, etc), care lucreaza in montaj EC. Castigul este in jur de 30dB.
Valorile elementelor nu sunt critice, intervalele fiind precizate pe schema. Bobina L are 15 spire. Se bobineaza direct pe bara de ferita a receptorului caruia sa-I marim sensibilitatea. Daca acesta nu este dotat cu antenna de ferita se cupleaza punctul A direct la intrarea de antenna a receptorului si se va avea grija ca masa montajului sa fie conectata la masa receptorului.
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