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Filtru cu cristale de cuart cu banda fixa sau variabila

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O schema foarte simpla si cu performante rezonabile de filtre cu quartz de SSB sau A1 gasiti aici :

http://yu1lm.qrpradio.com/XTAL-VAR%20FILTER-YU1LM.pdf

Se gasesc in comert cristalele la preturi mai mult decat radioamatoricesti.

Daca este realizata cu varicapuri poate deveni un filtru cu banda variabila, atat pentru A1 cat si pentru SSB (BLI sau BLS)

http://yu1lm.qrpradio.com/bp%20yu1lm.htm

 

Adaptarea de impedanta cu trafuri pe tor sau oala ferita reglabila (preferabil, pentru reglaj fin al neuniformitatilor in banda).

Filtrul este simetric, iar pentru 500 ohmi (de exemplu) traf 10:1 intrare si 1:10 iesire.

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