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C.D.

Preselector RX in regim de amator

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Da, mai in tinerete in urma cu 20 de ani.Este destul de bun, receptia este ceva mai putin zgomotoasa, curata semnalele parazite ale statiilor invecinate de puteri mari.Eu i-am pus pe intrarea de antena si 2 diode 1N4148 (in paralel anod/katod si katod anod), pentru limitarea semnalului de intrare la 700mV (de fapt semnalele parazite, masini, aspiratoare, descarcari electrice).Preselectorul este pentru statiile mai putin sofisticate, construite in regim de amator.Statiile cu dubla schimbare de frecventa, cu filtre cu cuart, cu adaptor antena, nu prea au nevoie de preselector, decat daca vrei un plus de atenuare in afara frecventei receptionate (aprox. -30dB).

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Preselectorul este pentru statiile mai putin sofisticate, construite in regim de amator.

Si eu am experimentat diverse preselectoare dar in cazul statiilor industriale, de generatie relativ noua, rezultatele nu sunt spectaculoase. In schimb la o Volna (care are si intrare speciala pentru preselector) isi face treaba destul de bine.......
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